Relevant bibliographies by topics / Seedling protection

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Seedling protection'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Seedling protection"

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Runde, Douglas E., Dale L. Nolte, Wendy M. Arjo, and William C. Pitt. "Efficacy of Individual Barriers to Prevent Damage to Douglas-Fir Seedlings by Captive Mountain Beavers." Western Journal of Applied Forestry 23, no. 2 (2008): 99–105. http://dx.doi.org/10.1093/wjaf/23.2.99.

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Abstract We tested the ability of individual tree seedling protectors to deter mountain beavers from damaging Douglas-fir seedlings. Using captive mountain beavers in field pens, we tested 20 products representative of a wide range of barriers suitable for protecting individual tree seedlings from rodent damage. Eleven products protected 95% or more of seedlings from damage. Tree shelters and fabric shelters provided the most protection; 98 and 95% of seedlings were undamaged, respectively. Rigid mesh protector tubes protected 81% of seedlings, and protection netting protected 55% of seedlings. Purchase prices varied widely; protection netting was least expensive, followed by rigid mesh tubes, fabric shelters, and tree shelters. Seedling growth was greatest within fabric shelters and plastic tree shelters. Materials used to construct 15 of the 20 tree protectors were tested using captive mountain beavers in small sheltered pens. Here, samples of barrier materials were used to block access to a favored food. The four materials that excluded all test animals in all trials were from unvented tree shelters with solid seamless walls. Seven materials failed to exclude any animals in the sheltered-pen trials.
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Zimmerling, Todd N., and Linda M. Zimmerling. "Effectiveness of a Physical Barrier in Deterring Vole and Snowshoe Hare Feeding Damage to Lodgepole Pine Seedlings." Western Journal of Applied Forestry 13, no. 1 (1998): 12–14. http://dx.doi.org/10.1093/wjaf/13.1.12.

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Abstract We examined the effectiveness of a tubular, polyethylene/polypropylene mesh seedling protection device in reducing overwinter feeding damage by snowshoe hares(Lepus americanus) and meadow voles (Microtus pennsylvanicus) on spring planted, plug stock (1 + 0) lodgepole pine(Pinus contorta). Seedlings fitted with the seedling protection devices (SPD) had significantly lower levels of feeding damage (3 and 9%) than control seedlings (25 and 41%) on two study sites. Most of the feeding damage to treated seedlings was the clipping of the terminal leader or laterals that were not protected by the protection device. In two instances, a vole tunneled under the seedling protection device to damage the stem of the treated seedling; however, this was the exception. This physical barrier can be effective in reducing feeding damage by small mammals on lodgepole pine. West. J. Appl. For. 13(1):12-14.
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Krstic, Milun, Branko Kanjevac, and Violeta Babic. "Effects of extremely high temperatures on some growth parameters of sessile oak (Quercus petraea/Matt./Liebl.) seedlings in northeastern Serbia." Archives of Biological Sciences 70, no. 3 (2018): 521–29. http://dx.doi.org/10.2298/abs171215013k.

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This paper presents research results on the effects of the extremely high temperatures during the heat wave of August 2017 on the growth and development of injury symptoms in sessile oak (Quercus petraea /Matt./Liebl.) seedlings of different age in the area of the Majdanpek municipality in northeastern Serbia. The starting hypotheses of this study is that the resistance of sessile oak seedlings to extremely high temperatures changes with age and that the stand canopy has a significant protective role in situations where sessile oak seedlings are endangered by extremely high temperatures. The extreme weather conditions at the beginning of August manifested themselves in extremely high temperatures and prolonged absence of precipitation. The average temperature at the beginning of August 2017 was 5.0 to 5.1o? (depending on the altitude) higher compared to the period of seedling growth (2010-2016). During the heat wave, the recorded precipitation was in the range from 0 to 1 mm. These climate conditions significantly affected the development of young seedlings, causing wilting of smaller or larger parts of the leaf surface and sometimes leading to plant death. Using analysis of variance, differences in the intensity of seedling damage were found to depend on age, height, and the protection provided by the mature stand canopy. The obtained results point to the very important role of mature trees in the protection of seedlings from the dangers of extremely high temperatures.
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Battaglia, M., and JB Reid. "The Effect of Microsite Variation on Seed-Germination and Seedling Survival of Eucalyptus delegatensis." Australian Journal of Botany 41, no. 2 (1993): 169. http://dx.doi.org/10.1071/bt9930169.

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The correlation between microsite and seedling numbers was determined in field sowings, and the impact of microsites on germination and seedling survival tested in artificial seedbeds in the glasshouse. Small scale variation in soil conditions, at the scale of tens of centimetres, markedly affected the germination and establishment of Eucalyptus delegatensis R.T.Baker seeds and seedlings. Under conditions of limiting soil moisture, microsites that afforded protection, and probably resulted in increased humidity, caused a marked increase in germination number and rate. The mean survival time was significantly higher on these protected microsites than on less protected microsites, or on microsites that restricted root penetration. The importance of this variability in microtopography was strongly influenced by season and the level of environmental stress, and was diminished as seedlings aged. Due to the different requirements for seed germination and seedling growth, a favourable microsite for germination was not necessarily a favourable site for seedling survival. A comparison of seed and seedling responses to water stress indicated that for E. delegatensis, at least, selection due to microsite differences at the time of germination may not have an impact on the developmental characteristics of the seedlings.
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Simova-Stoilova, L., K. Demirevska, T. Petrova, N. Tsenov, and U. Feller. "Antioxidative protection in wheat varieties under severe recoverable drought at seedling stag." Plant, Soil and Environment 54, No. 12 (2008): 529–36. http://dx.doi.org/10.17221/427-pse.

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The antioxidative protection in leaves of four winter wheat (<I>Triticum aestivum </I>L.) varieties with different field drought resistance was studied under severe recoverable soil drought at seedling stage by withholding irrigation for 7 days (57–59% leaf water deficit) followed by rewatering. A 3-fold raise in electrolyte leakage and a sharp increase in proline accumulation corresponded to drought severity. Hydrogen peroxide content and catalase (CAT) activity were maintained low under stress. Peroxidase (GPX) activity increased, whereas superoxide dismutase (SOD) activity only slightly changed. The content of ascorbate and low-molecular thiols diminished under severe drought and was restored in recovery. Malondialdehyde level was not changed significantly in drought-treated plants but raised after re-watering. In recovery CAT activity became significantly higher whereas GPX activity diminished. Three isoforms of SOD, one of catalase and three of GPX were revealed. Proline accumulation had a predominant role in drought response. As for varieties, drought sensitivity or tolerance was not necessarily correlated with differences in the antioxidative response at early vegetative stage.
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Wisudayati, Tri Astuti, Dian Charity Hidayat, and Dede J. Sudrajat. "The Development of Non-Tax State Revenue Potency by Applying the Logical Framework Approach: A Case Study of Nagrak Research Station in Bogor District, West Java." Jurnal Penelitian Kehutanan Wallacea 8, no. 2 (2019): 93. http://dx.doi.org/10.18330/jwallacea.2019.vol8iss2pp93-103.

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The Indonesian government strives to increase non-tax state revenues (PNBP). One of the potentials PNBP is using the state assets, such as research stations, for the public interest. This paper was aimed to formulate a strategy for the PNBP potential development using the Logical Framework Approach (LFA), with a case study at the Nagrak Research Station, Bogor. In order to avoid the failure when the PNBP potential development’s stages are implemented, policy makers need to build a hierarchy based on logical thinking of input, activity, output, impact, objectives and summarized them in a work plans matrix. The process of LFA development starts with the analysis of problems, goals, and strategies. Data and information were obtained through participant observation and documentation studies. The results showed that the commercialization of the operational units of research quality’ s seeds and seedlings at the Nagrak Research Station must be supported by the government policy, including: (1) planning of seed and seedling production with the consideration of price competitiveness (2) seeds and seedling production with the financial management flexibilities, and (3) seeds and seedling distribution with stakeholders protection from the non-quality seeds and seedling’s utilization.
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Morella, Norma M., Xuening Zhang, and Britt Koskella. "Tomato Seed-Associated Bacteria Confer Protection of Seedlings Against Foliar Disease Caused by Pseudomonas syringae." Phytobiomes Journal 3, no. 3 (2019): 177–90. http://dx.doi.org/10.1094/pbiomes-01-19-0007-r.

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The plant microbiome is known to benefit host health in numerous ways, including providing protection against pathogens. Here, we provide evidence that tomato seed-associated microbiota play an important role in early seedling health. To test the importance of seed epiphytic communities for seedling susceptibility to the common bacterial pathogen, Pseudomonas syringae pv. tomato, we transplanted naturally occurring seed epiphytic microbial communities back onto seeds prior to germination and compared disease susceptibility to those that were not reinoculated after surface sterilization. We found that the epiphytic microbiome can protect seedlings against Pseudomonas syringae pv. tomato establishment and disease, and we further show that this protective effect is not due to a genotype by microbiome interaction. Using 16S amplicon sequencing, we found that these microbiomes were dominated by species of Pantoea, and we took a culturing approach to show that these isolates, including both Pantoea agglomerans and Pantoea dispersa, are sufficient to protect against Pseudomonas syringae pv. tomato. By varying concentration of first the pathogen and then the protective symbiont, we then examined the dose response of protection and found that applying a higher concentration of protective inoculum to the seeds does not correlate to a lessened Pseudomonas syringae pv. tomato load but does reduce disease burden. Instead, the most protective dose of Pantoea in terms of Pseudomonas syringae pv. tomato growth corresponds to the original density at which protective bacteria were found on seeds. Overall, our findings contribute to a broader understanding of the importance of vertically transmitted plant-associated microbes, with implications for the design and efficacy of biocontrol agents.
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SAYYARI, Mohammad, Fardin GHANBARI, Sajad FATAHI, and Fatemeh BAVANDPOUR. "Chilling Tolerance Improving of Watermelon Seedling by Salicylic Acid Seed and Foliar Application." Notulae Scientia Biologicae 5, no. 1 (2013): 67–73. http://dx.doi.org/10.15835/nsb518293.

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Chilling temperatures lead to numerous physiological disturbances in the cells of chilling-sensitive plants and result in chilling injury and death of tropical and subtropical plants such as watermelon. In this study, the possibility of cold stress tolerance enhancing of watermelon seedling (Citrullus lanatus) by exogenous application of Salicylic acid (SA) was investigated. SA was applied through seed soaking or foliar spray at 0, 0.5, 1 and 1.5 mM concentration. After SA treatment, the seedlings were subjected to chilling 5 h/day at 4°C for 5 days. Statistical analysis showed significant effects of the application methods and SA concentrations on plant growth parameters, photosynthetic pigments, electrolyte leakage, proline and chilling injury index. SA application improved growth parameters and increased chlorophyll content of watermelon seedling subjected to chilling stress and provided significant protection against chilling stress compared to non-SA-treated seedlings. Although two SA application methods improved chilling stress tolerance, seed soaking method provided better protection compared to foliar spray method. SA ameliorated the injury caused by chilling stress via inhibiting proline accumulation and leaf electrolyte leakage. The highest cold tolerance was obtained with 0.5 mM SA application. Results indicate that SA could be used effectively to protect watermelon seedling from damaging effects of chilling stress at the early stages of growth.
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Parent, Sylvain, and Jean-Claude Ruel. "Chronologie de la croissance chez des semis de sapin baumier (Abies balsamea (L.) Mill.) après une coupe à blanc avec protection de la régénération." Forestry Chronicle 78, no. 6 (2002): 876–85. http://dx.doi.org/10.5558/tfc78876-6.

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The method of harvesting with protection of the advanced regeneration consists of a complete removal of the main canopy to release a seedling bank established under the overstory shade. After harvesting, seedlings acclimated to understory conditions could suffer from moisture stress, especially the small, juvenile seedlings (less than six years). The objective of the study is to determine the capacity of understory-acclimated balsam fir seedlings to respond positively and immediately to release. The response to release was studied in two seedling populations belonging to two distinct climatic regions of Quebec, the Western and the Eastern sections of the balsam fir-white birch ecological domain. Results show that the response patterns were similar in both populations. Response to release occurred in two steps. One year after harvesting, basal ring width was on the average five times larger than prior to harvesting (p > 0.001). Height growth only became significantly higher the second year after release (p < 0.001). On average, juveniles showed higher height growth rates (height growth/height) than older seedlings. This rate was negatively correlated to seedling height at harvesting (r = -0,68, p < 0.001). Our study clearly shows that balsam fir seedlings can respond immediately and positively to large openings. The strong response of juvenile seedlings to release indicates that these can contribute significantly to the future stand. The geographic and climatic differences between the two stands under study suggest that these observations apply to a wide range of balsam fir stands. Key words: advance growth, balsam fir, release
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Hilton, James L., and Parthasarathy Pillai. "Thioproline Protection of Crops Against Herbicide Toxicity." Weed Technology 2, no. 1 (1988): 72–76. http://dx.doi.org/10.1017/s0890037x00030128.

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Thioproline (L-thiazolidine-4-carboxylic acid) partially protects sorghum [Sorghum bicolor(L.) Moench. ‘DK 42Y’] seedlings against the herbicides tridiphane [2-(3,5-dichlorophenyl)-2-(2,2,2-trichloroethyl)oxirane] and alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide] in controlled environment chambers. Thioproline alone inhibits plant growth at concentrations above 10−5M. Its phytotoxicity is intermediate between the two herbicide antidotes OTC (L-2-oxothiazolidine-4-carboxylic acid) and flurazole [phenylmethyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate]. The two thiazolidine antidotes increased thiol content of excised corn (Zea maysL. ‘DK T 1100’) seedling roots whereas thiol content was decreased by the two herbicides. While thioproline or OTC partially offset tridiphane-induced decreases in thiol content, none of the antidotes effectively circumvented the reduced thiol content resulting from alachlor treatment.
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Dissertations / Theses on the topic "Seedling protection"

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Eilert, Annette. "Alternativa metoder till hägn för att minimera viltskador på hybridaspföryngringar." Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-65518.

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The purpose of the study was to find alternatives to fences by comparing the frequency of damages on different configurations of chemical treated, mechanically protected and untreated hybrid aspen seedlings, planted on agricultural land. The study also explored whether anthropogenic disturbance (proximity to roads and buildings) had any effect on the frequency of seedlings damages. The study was conducted as a quantitative study with field measurements over the course of a year, in two sample plots with hybrid aspen seedlings planted in May 2016 in Vimmerby kommun, Kalmar län. The field data was compiled into Excel and compared for differences between treatments and proximity to anthropogenic disturbance. The result showed that seedlings closer to anthropogenic disturbance showed a lower frequency of damage. There was no significant difference between the mechanical (Taimitassu) and chemical (Arbinol B) seedling protection. The highest frequency of damages occurred in the summer, peaking in July. In conclusion, when choosing a place to plant hybrid aspen, there should be anthropogenic disturbance to minimize the frequency of browsing.
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Sopher, Coralie Rachelle. "Paclobutrazol-induced changes associated with stress protection in maize seedlings." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ33276.pdf.

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Phang, Ing Chia. "Response of Arabidopsis thaliana seedlings to lead exposure." Thesis, University of Canterbury. School of Biological Sciences, 2010. http://hdl.handle.net/10092/4467.

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Lead (Pb) is one of the most commonly occurring, highly persistent and widely distributed heavy metal contaminants in the environment. It has a tendency to bioaccumulate in animals and plants, and potentially, it is able to enter the human food chain where it poses a hazard to public health. Generally, conventional remediation technologies applied to decontaminate heavy metals from groundwater and soils are very costly. Hence, phytoremediation has emerged as an ecologically friendly and economically attractive technology that uses green plants to clean up heavy metal contaminated sites. However, a lack of knowledge of the biological processes associated with plant responses to Pb (e.g. Pb uptake, accumulation, translocation, and tolerance) has been a bottleneck for the application of Pb phytoremediation in the field. A model genetic system of higher plants, Arabidopsis thaliana, was selected to further examine the physiological, biochemical and molecular events occuring in plants under Pb stress. The overall aim of this project was to obtain a better understanding of plant responses to Pb contaminants in the early developmental stages of A. thaliana seedlings. This research encompassed the physiological responses of A. thaliana seedlings to Pb exposure, monitoring their antioxidative defence systems, and investigating the participation of annexin 1 in the response to Pb-mediated oxidative stress. This research also assessed the protective effect of nitric oxide on Pb-induced toxicity of A. thaliana seedlings and it isolated a putative Pb tolerant mutant from an EMS-mutagenized M2 population. A multiexperimental approach was adopted to achieve these objectives. A. thaliana seedlings were grown on modified Huang & Cunningham (1996) nutrient solution containing 0.8% (w/v) agar, with and without Pb(NO3)2, under controlled conditions. A. thaliana seedlings were insensitive to Pb during seed germination. In treatments with up to 200 μM Pb(NO₃)₂, morphological changes and inhibition of root growth were observed in the 7-d-old seedlings. A tolerance index revealed that Pb(NO₃)₂ concentration of 75 μM and higher brought about more than 50% root growth inhibition. Pb was predominantly retained in the roots. Analysis using a graphite furnace atomic absorption spectroscopy indicated that the level of Pb accumulation in A. thaliana roots was greatly dependent on the Pb(NO₃)₂ concentrations, but only a small fraction of the accumulated Pb was translocated to the shoots (18 - 43%). Transmission electron microscopy analysis showed that Pb was mainly immobilized in the cell walls and intercellular spaces. This was interpreted as a mechanism that minimizes the entry of Pb into cells and interference with cellular functions. Pb that gained entry into the cytoplasm was sequestered into the vacuoles. The toxicity of Pb in the cytosol of A. thaliana seedlings was studied by measuring the H₂O₂ and lipid hydroperoxide levels using a microplate reader. When the Pb(NO₃)₂ concentration in the growth medium was 100 μM, the 7-d-old seedlings contained 2.2-fold higher H₂O₂ and 9.6-fold higher lipid hydroperoxide than the control without Pb(NO₃)₂. This was followed by an up-regulation of the activity of antioxidative enzymes, including superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), glutathione peroxidase (GPX), and general peroxidase (POD) by 2.1-, 3.2-, 2.3-, 1.8- and 4.6-fold, respectively, compared with the control. Pb toxicity is known to trigger oxidative stress, but A. thaliana seedlings appeared to be capable of activating cell rescue, defending themselves against harmful oxidative stress and also acclimating to Pb. Data from physiological and biochemical analysis indicate that a combination of avoidance and tolerance mechanisms exists in Pb-treated A. thaliana seedlings to maintain the essential cellular metabolism for survival. Real-time reverse-transcription polymerase chain reaction was used to show the involvement of AnnAt1 in the response of 7-d-old A. thaliana seedlings to a high threshold concentration of Pb. When the seedlings were treated with 100 μM Pb(NO₃)₂, AnnAt1 message levels were up-regulated by 2.12-fold. Pb-mediated oxidative stress may be a component of AnnAt1 gene expression. AnnAt1 potentially could be invoked to reduce the toxic effects of Pb stress by acting as ROS and/or Ca²⁺ signals, as a membrane protector, in detoxification of excessive ROS, or in sequestration of Pb. Pb stress symptoms were less evident in seedlings pre-treated with 1 mM sodium nitroprusside (SNP), a nitric oxide (NO) donor. The present study found that exogenous NO did not alter Pb transport into the plants or efflux pumping of Pb at the plasma membrane. However, NO conferred protection to 7-d-old A. thaliana seedlings primarily by acting as an antioxidant or a signal for actions to scavenge excessive ROS level. The application of exogenous NO before subjecting to 100 μM Pb(NO₃)₂ decreased H₂O₂ back to its original level, and reduced 50% lipid hydroperoxide in the Pb-treated seedlings. As a result, the antioxidative enzyme activities in Pb-exposed seedlings pre-treated with SNP were 23 - 45% lower than those without SNP pre-treatment. Less antioxidative enzyme activities were probably needed to counteract the reduced amount of Pb-induced ROS in A. thaliana seedlings. A post-germination procedure involving prolonged exposure to 150 μM Pb(NO₃)₂ was developed to screen an EMS-mutagenized M2 population of A. thaliana. Potential Pb tolerant mutants were selected based on the ability to grow with their roots penetrating into the medium and maintain purple-green leaves without wilting. A minority of the survivors appeared to go into a resting stage and they seemed to have altered transporters that prevented Pb from entering the cells. Only one putative Pb mutant (M3-1) was recovered from the rescue and set seeds. The M₄ generation of this putative Pb mutant was re-screened for phenotypic confirmation and to determine the regulation of AnnAt1. The 7-d-old putative Pb mutant seemed to display enhanced root and shoot growth in the presence of 150 μM Pb(NO₃)₂ compared to the wild-type seedlings. The transcript level of AnnAt1 in this putative Pb tolerant mutant increased by 2.19-fold when exposed to 150 μM Pb(NO₃)₂.
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Wallertz, Kristina. "Pine weevil Hylobius abietis feeding in shelterwood systems /." Alnarp : Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/10040784.pdf.

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Spies, Christoffel F. J. (Christoffel Frederik Jakobus). "The inoculum ecology of Botrytis cinerea in Rooibos nurseries." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20943.

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Thesis (MScAgric)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Grey mould, caused by Botrytis cinerea, is the most important foliar disease of rooibos seedlings. Although the disease is primarily controlled with applications of fungicides, the improvement of cultural methods of disease management should lessen this dependence on chemical control. Such improvements would, however, not be possible without knowledge of the inoculum sources and dispersal of the pathogen. The aim of this study was to investigate the inoculum ecology of B. cinerea in rooibos nurseries in order to identify primary sources of inoculum and to improve the environmentally friendly management of the disease. The study was conducted in four nurseries over two production seasons (March to July 2003 and 2004). Levels of airborne inoculum of B. cinerea were monitored on a monthly basis inside and around the nurseries with spore traps. Samples of plant material and organic debris were taken in the corresponding areas to determine the incidence of plant material infected by the pathogen and the incidences of grey mould in the nurseries were recorded. Low numbers of B. cinerea colonies were observed on the spore traps. Similar levels of airborne inoculum were observed inside and around the nurseries. The incidence of plant material yielding B. cinerea was higher outside the nurseries than inside, indicating the importance of such materials as potential sources of inoculum. Since patterns of airborne inoculum observed in this study confirmed reports of the local dispersal of B. cinerea, the removal of possible hosts outside the nurseries could aid in the management of grey mould in rooibos nurseries. Resistance to dicarboximide fungicides is a genetically stable trait in B. cinerea, and therefore has the potential to be used as a phenotypic marker. This marker can be used to gain knowledge on the dispersal of B. cinerea inoculum inside and outside rooibos nurseries. Isolates of B. cinerea collected from the air and from plant material in and around four rooibos nurseries were assessed for resistance to iprodione at 1 and 3 μg/ml a.i. Some of the isolates showed resistance to iprodione at 1 μg/ml a.i. However, none of the isolates showed resistance at 3 μg/ml a.i. iprodione. The initial incidence of dicarboximide-resistance at the nurseries was slightly higher than expected. As the season progressed, the incidence of iprodione-resistant isolates decreased towards May, after which an increase was observed towards July. A relatively high percentage of isolates collected outside the nurseries was found to be dicarboximide-resistant. Two of the nurseries had a significant higher incidence of resistant isolates on plant material collected inside, than on plant material collected outside the nursery. However, when looking at resistance levels of airborne isolates, no significant differences were found in the incidence of resistant isolates sampled inside and outside the four nurseries. The data indicated the importance of organic debris and seed-borne infections in the survival and dispersal of dicarboximide-resistant isolates of the pathogen. With the current emphasis on organic agriculture the knowledge gained in this study presents valuable possibilities of improving the cultural management of grey mould in rooibos nurseries.<br>AFRIKAANSE OPSOMMING: Vaalvrot, veroorsaak deur Botrytis cinerea, is die belangrikste bo-grondse siekte van rooibossaailinge. Alhoewel die beheer van die siekte hoofsaaklik op die gebruik van fungisiede berus, behoort die verbetering van verbouingspraktyke hierdie afhanklikheid van chemiese beheer te verminder. Sulke verbeteringe sal egter slegs moontlik wees indien voldoende kennis van die inokulumbronne en verspreiding van die patogeen beskikbaar is. Die doel van hierdie ondersoek was om die inokulum ekologie van B. cinerea in rooibos kwekerye te ondersoek sodat primêre inokulumbronne opgespoor en omgewingsvriendelike siektebestuurspraktyke verbeter kan word. Die ondersoek is in vier kwekerye oor twee produksie seisoene (Maart tot Julie 2003 en 2004) uitgevoer. Vlakke van luggedraagde inokulum van B. cinerea is op ’n maandelikse basis met behulp van spoorvangers binne en buite die kwekerye gemonitor. Monsters van plantmateriaal en organiese materiaal is in ooreenstemmende areas geneem om die voorkoms van B. cinerea geïnfekteerde plantmateriaal vas te stel en die voorkoms van vaalvrot in die kwekerye is aangeteken. Min B. cinerea kolonies is op die spoorvangers waargeneem. Soortgelyke vlakke van luggedraagde inokulum is binne en buite die kwekerye waargeneem. Die hoër voorkoms van B. cinerea geïnfekteerde plantmateriaal buite die kwekerye as binne, dui op die belang van sulke materiaal as potensiële inokulumbronne. Aangesien die patrone van luggedraagde inokulum, soos waargeneem in hierdie ondersoek, ander berigte van B. cinerea se beperkte verspreidingsvermoë bevestig, kan die verwydering van moontlike alternatiewe gashere buite die kwekerye die bestuur van die siekte binne die kwekerye verbeter. Weerstand teen dikarboksimied fungisiede is ’n geneties-stabiele kenmerk in B. cinerea en het daarom potensiaal om as ’n fenotipiese merker gebruik te word. Hierdie merker kan gebruik word om kennis aangaande die verspreiding van B. cinerea in en om rooibos kwekerye in te samel. Botrytis cinerea isolate in lug en op plantmateriaal in en om vier rooibos kwekerye is gedurende 2003 en 2004 versamel. Die isolate is vir weerstandbiedendheid teen iprodioon by konsentrasies van 1 en 3 μg/ml aktiewe bestandeel (a.b.) getoets. Isolate met weerstand teen 1 μg/ml a.b. iprodioon is waargeneem, maar nie teen 3 μg/ml nie. Die aanvanklike voorkoms van dikarboksimiedweerstand by die kwekerye was hoër as verwag. Hierdie vlak het egter gedaal met die verloop van die seisoen tot in Mei, waarna ’n toename tot in Julie waargeneem is. Die persentasie dikarboksimied-weerstandbiedende isolate buite die kwekerye was relatief hoog. In twee van die kwekerye was die voorkoms van weerstandbiedende isolate op plantmateriaal in die kwekerye betekenisvol hoër as op plantmateriaal buite die kwekerye. Daar was egter geen betekenisvolle verskille in die voorkoms van luggedraagde weerstandbiedende isolate nie, ongeag van die kwekery of posisie. Die data dui op die belang van organiese materiaal en saadgedraagde infeksies in die oorlewing en verspreiding van dikarboksimied-weerstandbiedende isolate van die patogeen. Met die huidige klem op organiese landbou bied die inligting wat in hierdie ondersoek versamel is moontlike praktyke wat geïmplementeer kan word om die beheer van vaalvrot in kwekerye met behulp van verbouingspraktyke te verbeter.
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Foury, Claude. "Quelques aspects du developpement de l'artichaut (cynara scolymus l. ) issu de semences : analyse plus particuliere de la floraison en conditions naturelles." Paris 6, 1987. http://www.theses.fr/1987PA066169.

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Etude faite pour 3 categories de contraintes : application en selection, absence d'enceinte climatisee, encombrement de la plante. Approche principale par l'echelonnement des semis. Etude des exigences en froid. Effets des traitements au ga::(3). Definition de regles de culture a partir de plants de semis. Etablissement de processus experimentaux de culture sequentielle en conteneur
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HOŘEJŠÍ, Edita. "Klíčivost a vzcházivost semen kosatce sibiřského (Iris sibirica L.) v závislosti na typu managementu." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-375352.

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This work continue on a bachelor's work which investigated production characteristics of the plant species Siberian Iris (Iris sibirica). The aims of the presented work are reproductive properties by seeds of Siberian Iris in relation to the seed germination and with various meadow managements. Seeds of Siberian Iris (collected in 2015 and 2016) were investigated in laboratory condition and at meadow near the pond Dolní Stržený (Dlouhá Lhota, of the Tábor District). Seeds were divided into groups according to 4 treatments: without intervention, scarification, thermal stratification and cold stratification. The field experiment runs from September 2016 to August 2017.The aim was to find out the most appropriate type of management (mowing, disturbance) that would promote seed germination and seedling recruitment. Results from the both experiments: a positive effect of germination after the scarification, better recruitment of seeds in square without intervention, seeds probably needs to be stored for a longer period before sowing. These results cannot be generalized, because small number of repetitions were performed. All the obtained data was discussed and recommendations for the plant management were formulated.
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Stjernberg, Ernst I. "The effectiveness of reflective tarpaulins in protecting tree seedling against heat stress." Thesis, 1995. http://hdl.handle.net/2429/3664.

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Reflective tarpaulins are used extensively in western Canada to protect tree seedlings against solar radiation during on-site storage and transportation. This project determined heat transfer characteristics of new and used reflective tarpaulins, and a FIST (Fiberglass Insulated Seedling Transporter) canopy. Containerized white spruce (Picea glauca (Moench) Voss) seedlings in shipping boxes were stored under tarpaulins and in the FIST canopy for up to six days in June, 1992. An unprotected seedling box was used as the control. Average seedling box temperatures per each 15-minute period were recorded for 144 h. Solar irradiance and wind speed at the test site were recorded simultaneously with box temperatures. The electrical conductivity of needles was measured after storage. Seedlings were withdrawn daily for six days and outplanted in a nursery plot in a split-plot randomized complete block design with repeated measurements within each experimental unit. Root collar diameter, total height and survival were recorded for three growing seasons. Samples of the tarpaulins were also tested under controlled conditions for ability to resist heat transfer. Seedling box temperatures ranged up to 35°C. Significant differences in 144-hour heat sums were found between: new and used tarpaulins; various used tarpaulins; tarpaulins and control; three new tarpaulins and the FIST canopy. Relative conductivities indicated no storage-induced damage to cell membranes. Survival after three years was 99.8%. Significant differences in growth were found but were more likely related to differences in soil nutrient differences within the plot. Storage temperature and length had no effect on growth and survival. A laboratory experiment tested for storage-induced pre-conditioning effects. Controls and seedlings pre-conditioned 4 and 8 days for 3 h at 30°C, were heat stressed for 8 h or 48 h at 30, 35, and 40°C. Electrical conductivities of needles were measured. Seedlings were outplanted in two plots with a completely randomized design. Root collar diameter, total height and survival were recorded for two growing seasons. No cell membrane damage was observed. Survival after two years was 99.5%. Evidence for a pre-conditioning effect is inconclusive. The 8-day pre-conditioning may have resulted in higher growth in seedlings heat stressed for 48 h.
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Lin, Pei-Ling, and 林佩玲. "The accumulation of heat shock proteins in rice plants and their roles in protecting the rice rice seedlings from heat and oxidative stresses." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/47985909784455439856.

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碩士<br>國立中興大學<br>植物病理學系<br>93<br>The accumulation of heat shock proteins (HSPs) in rice (Oryza sativa L. cv. Tainong 67) seedlings under different stresses (heat, UV, and H2O2) and Rhizoctonia solani infection was studied using western blot analysis. The results revealed that heat treatment induced HSP60, HSC70 (HSP73), HSP90, and the class I small HSPs (sHSP-CI) in rice seedlings, but Rhizoctonia solani induced none of those HSPs in rice seedlings; UV-C treatment induced only HSP60, whereas H2O2 induced sHSP-CI, HSC70 (HSP73) and HSP90. Whether the accumulation of HSPs could confer tolerance of rice seedlings to subsequent heat or H2O2 stress was also studied. Rice seedlings pretreated with mild heat stress to induce the accumulation of HSPs could increase the tolerance of rice seedlings to subsequent heat stress and H2O2 stress. Moreover, HSPs accumulation during rice seed maturation and germination processes was also analyzed. The results indicated that the accumulation of sHSP-CI and HSC70 (HSP73) increased during rice seed maturation, but the accumulation of HSP60 and HSP90 did not change. The accumulation of sHSP-CI, however, decreased during rice seed germination, whereas the HSC70 (HSP73) did not.
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Books on the topic "Seedling protection"

1

Manchester, Edwin H. Tree shelters show promise for oak regeneration. U.S. Dept. of Agriculture, Forest Service, Cooperative Forestry, 1988.

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Manchester, Edwin H. Tree shelters show promise for oak regeneration. U.S. Dept. of Agriculture, Forest Service, Cooperative Forestry, 1988.

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Schaap, Wieger. Seedling protectors for preventing deer browse. Forest Research Laboratory, College of Forestry, Oregon State University, 1986.

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Devine, Warren D. Influence of four tree shelter types on microclimate and seedling performance of Oregon white oak and western redcedar. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 2008.

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DeCalesta, David S. Controlling pocket gopher damage to conifer seedlings. Extension Service, Oregon State University, 1987.

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Schuler, Thomas M. Residual overstory density affects survival and growth of sheltered oak seedlings on the Allegheny Plateau. United States Dept. of Agriculture, Forest Service, Northeastern Research Station, 2005.

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Manchester, Edwin H. Tree shelters show promise for oak regeneration. U.S. Dept. of Agriculture, Forest Service, Cooperative Forestry, 1988.

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Krasowski, Marek J. Winter freezing injury and frost acclimation in planted coniferous seedlings: A literature review and case study from northeastern British Columbia. Forestry Canada, 1993.

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James, Robert L. Preplant soil treatment effects on production of Douglas-fir seedlings at the USDA Forest Service Nursery, Coeur D'Alene, Idaho. U.S. Dept. of Agriculture, Forest Service, Northern Region, Forest Health Protection, 2004.

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Steen, O. A. Identification and management of summer frost-prone sites in the Cariboo Forest Region. Canada/BC Economic & Regional Development Agreement, 1991.

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Book chapters on the topic "Seedling protection"

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Orozco-Nunnelly, Danielle A., Lon S. Kaufman, and Katherine M. Warpeha. "G Protein Signaling in UV Protection: Methods for Understanding the Signals in Young Etiolated Seedlings." In Methods in Molecular Biology. Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-532-3_10.

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O. Numbere, Aroloye. "Mangrove Restoration under Different Disturbances Regime in the Niger Delta, Nigeria." In Mangrove Ecosystem Restoration [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96127.

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Mangroves of the Niger Delta are the largest in Africa and are the source of numerous ecosystem services such as firewood, seafood, building materials and medicinal herbs. Their sustainable use and protection are important for future generations. However, anthropogenic activities such as oil and gas exploration, urbanization, industrialization, dredging, overexploitation and sand mining are the major disturbances that have pushed the mangroves to the brink of extinction. Therefore, in other to restore lost areas of the mangroves natural and artificial means can be adopted to bring them to a restored state. More often than not emphasis of recovery had been placed on artificial remediation and restoration, where polluted sites are cleaned with chemicals and nursery seedlings transplanted to remediated such sites. Nevertheless, this chapter discusses the possibility of utilizing natural means of forest recovery through seedling recruitment and regeneration. This can be achieved by establishing the right environmental conditions such as setting up of a hydro-channel to ensure smooth inflow and out flow of river water carrying seeds, availability of parent mangrove trees to supply the seeds, and the availability of the right soil condition to enable seedling germination and growth. The use of dried and ground mangrove parts as a new way for restoring polluted soil is discussed; in addition, the unconventional proposition of using low key pollution to manage and increase forest resilience is highlighted in this work even though further studies are recommended. Future direction of mangrove restoration should be tilted towards the application of the force of nature, which has the potentials of reversing the adverse effect of anthropogenic activities in well managed and protected sites.
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Plörer, Matthias, and Dieter Stöhr. "Gries am Brenner/Vals Pilot Action Region The Tyrolean Ski Tour Steering Concept: A Contribution to the Protection of Wildlife and Object Protective Forests." In Best Practice Examples of Ecosystem-Based Risk Management Implementation in the GR4A Pilot Action Regions [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99011.

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When people engage in recreational activities in sensitive forest habitats, there can be unintended negative impacts on wildlife and forests. These include disturbance and displacement of wild game as well as damage to young plants (tree seedlings and saplings from ski or snowshoe compaction or direct physical damage from ski edges). These are just a few examples that highlight the need to manage the impact of recreationists with different measures in order to minimize the disturbance of game (especially red deer and roe deer) and the impairment of important object protective forests that this in turn causes. In Section 2 of this chapter, we describe the tourism, population, settlement area, economy, forestry and natural hazards in the GreenRisk4Alps Pilot Action Region (PAR) of Gries am Brenner and Vals in Tyrol, Austria. Section 3 provides an overview of the overarching initiative and integration forum, “Tyrolian mountains – experience together”, which was initiated by the Amt der Tiroler Landesregierung (Office of the Tyrolean Provincial Government). We then provide a description of the exact workflow, the possible measures and other details on ski tour steering options. Ski tour steering measures in the Gries am Brenner and Vals PAR can be found in Section 3.4, followed by a critical review of the experiences in Section 4.
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Conference papers on the topic "Seedling protection"

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Chen, J., J. H. Wu, H. P. Si, and K. Y. Lin. "Regulation technology for seedling growth in the plug seedling." In International Conference on Earth Science and Environmental Protection (ICESEP2013). WIT Press, 2013. http://dx.doi.org/10.2495/icesep130931.

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Lupascu, Galina, and Svetlana Gavzer. "Considerații cu privire la interacțiunile grâu – patogeni fungi în contextul schimbărilor climatice." In International Scientific Symposium "Plant Protection – Achievements and Prospects". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2020. http://dx.doi.org/10.53040/9789975347204.06.

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It was established that the environmental conditions strongly influence the fungal spectrum that causes the root rot of the stem base to common wheat in the conditions of the Republic of Moldova. In more severe conditions (high temperature, drought) the incidence of Fusarium equiseti increases. The interaction of common wheat with one of the causative agents of stem rot – F. oxysporum is determined by the combination, the orientation of the cross to obtain F1 hybrids, the temperature factor, which has a direct impact on seedling growth and transgressive potential of F2 segregating populations, a phenomenon with major importance for the improvement programs.
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Lupascu, Galina, and Svetlana Gavzer. "Variabilitatea şi heritabilitatea vigorii boabelor de grâu comun la interacţiunea cu Drechslera Sorokiniana." In International Scientific Symposium "Plant Protection – Achievements and Prospects". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2020. http://dx.doi.org/10.53040/9789975347204.68.

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The article presents data on the effects of the interaction of common wheat with the fungus Drechslera sorokiniana on grain vigor. Its differentiated action on germination and seedling length (LP) was found. The vigor index (VI) depended more on LP (r = 0.90 *) than on the germination 278 level (r = 0.52 *, p≤0.05). The coefficient of heritability in the broad sense (h2) was 71.3% for LP and 60.1% – for VI. The association of h2 and genetic progress with high values reveals the pronounced contribution of additive genetic variance in the control of the vigor index, which offers increased opportunities in the selection of wheat plants resistant to this pathogen in restricted terms.
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Pawlat, Joanna, Piotr Terebun, Michal Kwiatkowski, et al. "Effects of helium-air Rf plasma jet on onion seedling growth." In 2017 International Conference on Electromagnetic Devices and Processes in Environment Protection with Seminar Applications of Superconductors (ELMECO & AoS). IEEE, 2017. http://dx.doi.org/10.1109/elmeco.2017.8267750.

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Dias, Walter. "AgMusa: A new collaborative technology to optimize seedling health, transplanting and protection of sugarcane." In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.94483.

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Luan, Chunyan, Xiaoling Li, Jin Yang, Xuesong Wang, and Fangqing Chen. "Seed germination, seedling growth and mortality of two differentDistylium chinensepopulations to different flooding regimes in the Three Gorges Reservoir Region, China." In International Conference on Earth Science and Environmental Protection (ICESEP2013). WIT Press, 2013. http://dx.doi.org/10.2495/icesep131191.

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Gveroska, B. "TRICHODERMA BIOCONTROL AGENTS FOR TOBACCO SEEDLINGS PROTECTION." In Состояние и перспективы мировых научных исследований по табаку, табачным изделиям и инновационной никотинсодержащей продукции. Государственное научное учреждение Всероссийский научно-исследовательский институт табака, махорки и табачных изделий Российской академии сельскохозяйственных наук, 2020. http://dx.doi.org/10.48113/496_2020_155-165.

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Li, Hongyan, Jianhua Li, Huashan Lian, Wei Jiang, and Lijin Lin. "Cadmium Accumulation Characteristics of Lycopersicon esculentum Seedlings." In 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017). Atlantis Press, 2017. http://dx.doi.org/10.2991/iceep-17.2017.172.

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Qing, Mei, Lijin Lin, and Mingran Liao. "Cadmium Accumulation Characteristics of Cyphomandra betacea Seedlings." In 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018). Atlantis Press, 2018. http://dx.doi.org/10.2991/iceep-18.2018.299.

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Скорейко, А., Татьяна Андрийчук та Р. Билык. "Влияние биопрепаратов на приживаемость и продуктивность растений in vitro". У International Scientific Symposium "Plant Protection – Achievements and Prospects". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2020. http://dx.doi.org/10.53040/9789975347204.58.

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The results of studies of the influence of biologicals on the process of adaptation of microclonal potato plants to in vivo conditions in greenhouse and field conditions are presented. Treatment of plant material with biological products Planriz and PhytoDoctor promotes the adaptation of in vitro potato plants to in vivo conditions, increases the survival rate of up to 97,8% of potato seedlings and increases the yield of mini-tubers.
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Reports on the topic "Seedling protection"

1

Walters, Russell S., and Russell S. Walters. Protecting red oak seedlings with tree shelters in northwestern Pennsylvania. U.S. Department of Agriculture, Forest Service, North Central Research Station, 1993. http://dx.doi.org/10.2737/ne-rp-679.

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