Relevant bibliographies by topics / Seedling physiology

Contents

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

Academic literature on the topic 'Seedling physiology'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Seedling physiology"

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Kerr, Kelly L., Nicole Zenes, Anna T. Trugman, and William R. L. Anderegg. "Testing the effects of species interactions and water limitation on tree seedling biomass allocation and physiology." Tree Physiology 41, no. 8 (2021): 1323–35. http://dx.doi.org/10.1093/treephys/tpab005.

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Abstract Species interactions mediate tree responses to water limitation because competition and/or facilitation alter plant physiology and growth. However, because it is difficult to isolate the effects of plant–plant interactions and water limitation from other environmental factors, the mechanisms underlying tree physiology and growth in coexisting plants under drought are poorly understood. We investigated how species interactions and water limitation impact the physiology and growth of trembling aspen (Populus tremuloides), narrowleaf cottonwood (Populus angustifolia) and ponderosa pine (Pinus ponderosa) seedlings in a controlled environment growth chamber, using aspen as a focal species. Seedlings were grown in pots alone or with a con- or hetero-specific seedling, and were subjected to a water limitation treatment. Growth, water status and physiological traits were measured before, during and after the treatment. Under well-watered conditions, the presence of another seedling affected growth or biomass allocation in all species, but did not impact the physiological traits we measured. Under water limitation, the presence of a competing seedling had a marginal impact on seedling growth and physiological traits in all species. Throughout the study, the magnitude and direction of seedling responses were complex and often species-specific. Our study serves as an important step toward testing how species’ interactions modify physiological responses and growth in well-watered and water-limited periods.
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MacDonald, Joanne E., and John N. Owens. "Morphology, Physiology, Survival, and Field Performance of Containerized Coastal Douglas Fir Seedlings Given Different Dormancy-induction Regimes." HortScience 41, no. 6 (2006): 1416–20. http://dx.doi.org/10.21273/hortsci.41.6.1416.

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The effects of different dormancy-induction regimes on first-year containerized coastal Douglas fir [Pseudotsuga menziesii (Mirb.) Franco var. menziesii] seedling morphology and physiology in the nursery, as well as seedling survival and performance after one growing season in a common garden, were investigated. In early July, three dormancy-induction regimes were applied: moderate moisture stress (MS), short day (SD), and short day with moderate moisture stress (SD+MS). In early October, seedling height, root collar diameter, and shoot dry weight were unaffected by regime, but root dry weight was reduced in seedlings from the MS and SD+MS regimes compared with the SD regime. At this time, morphogenesis was completed in all terminal buds of seedlings from both SD regimes, whereas it continued in all terminal buds of seedlings from the MS regime. Furthermore, 25% to 88% of terminal buds from the SD regimes were endodormant, but none from the MS regime were endodormant. In March, budbreak occurred at the same time in seedlings from the two SD regimes and was earlier than in seedlings from the MS regime; root growth capacity was unaffected by regime. After one growing season, there were no regime differences in seedling survival, root collar diameter, shoot dry weight, root dry weight, length of the current-year leader, or number of needles on the leader.
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Mota, C. S., Fabiano Guimarães Silva, Paulo Dornelles, Mariângela Brito Freiberger, Daniele Nogueira dos Reis, and Giselle Camargo Mendes. "Parameters of Physiology, Nutrition and Quality of Eugenia dysenterica DC Seedlings Grown in Organic Substrates from the Agricultural Industry." Journal of Agricultural Science 10, no. 1 (2017): 73. http://dx.doi.org/10.5539/jas.v10n1p73.

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Residues from agricultural activities might be used as substrates for production of seedlings. In this study it was aimed to evaluate the physiology, nutrition and quality of Eugenia dysenterica DC. seedlings grown in substrates derived from agricultural organic wastes. The wastes used were as follows: rice husks (RHs); fermented cattle manure (FCM); cattle manure compost (CMC), which contained corn silage and FCM; sugarcane bagasse (SCB); filter cake from sugar-alcohol mills (FC); and subsoil (SB). Four substrates were formulated from the wastes, namely SB+RH (1:1; v:v), SB+CMC (1:1), SB+FCM (3:1) and SCB+FC (3:2) and BioplantÒsubstrate was also used. The following characteristics were evaluated: the emergence and vigor percentages, biometric characteristics, seedling quality indices, gas exchange, chlorophyll a fluorescence and leaf nutrient levels. The seedling emergence was similar for all the substrates. The highest vigor was found in seedlings that were cultivated in SCB+FC, which was equal to the vigor observed in BioplantÒ. In general, the use of the SB+CMC substrate gave better seedling results for the biometric and nutritional characteristics, followed by SCB+FC. Most of the biometric characteristics showed a correlation with photosynthesis, electron transport rate and effective quantum yield of photosystem II, thus showing that these characteristics can be alternatives to the traditional quality indexes used for seedlings. The use of CMC, SCB and FC was shown to be appropriate for the production and nutritional supply of seedlings’ specie. The composition SB (subsoil)+CMC (1:1) proved to be the most suitable to produce E. dysenterica seedlings.
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Li, Yang, Juanqi Li, Guoxiu Wu, et al. "Design of an Air Blowing Device Above Seedbed: The Effect of Air Disturbance on the Microenvironment and Growth of Tomato Seedlings." HortScience 55, no. 8 (2020): 1308–14. http://dx.doi.org/10.21273/hortsci15136-20.

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In recent years, air circulation has been used in protected cultivation to improve the microenvironment around seedlings, which in turn enhances photosynthesis and seedling growth. However, a practical and precise air circulation device has not yet been reported, especially one for growing seedlings in a greenhouse. Considering the use of a seedbed in seedling cultivation, a blower that can move back and forth on the seedbed and accurately control the air velocity is designed. In this experiment, we take the nonblowing treatment as the control (CK); three air velocities (0.3, 0.6, and 0.9 m/s) were selected to investigate the effect of interval blowing on the microenvironment of the canopy, physiology of seedling growth, stomatal characteristics of leaves, and stem mechanics of tomato seedlings. The three air velocities were found to significantly reduce the canopy temperature by 0.44, 0.78, and 1.48 °C lower than the CK, respectively, and leaf temperature by 0.83, 1.57, and 2.27 °C lower than the CK, respectively, in cultivated seedlings during summer. The relative humidity of the tomato seedling canopy decreased by 2.7% to 7.0%. Compared with the CK, the plant height of tomato seedlings decreased by 13.54% and root dry mass, root-shoot ratio, and seedling quality index (SQI) increased by 34.63%, 21.43%, and 14.29%, respectively, at 0.6 m/s. In addition, mechanical indexes such as hardness and elasticity of the tomato seedling stem were higher under air disturbance than those of the CK. The best effect was seen in the treatment with the air velocity of 0.6 m/s, in which the hardness and elasticity of the stem base and the first node were significantly higher than that of the CK. In conclusion, air disturbance generated by the air blowing device we designed effectively improved the microenvironment around the plants, enhanced the physiological activity of the seedlings, and thereby promoted seedling growth.
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MacDonald, Joanne E., and John N. Owens. "Physiology and Growth of Containerized Coastal Douglas Fir Seedlings Given Different Durations of Short Days to Induce Dormancy." HortScience 45, no. 3 (2010): 342–46. http://dx.doi.org/10.21273/hortsci.45.3.342.

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We compared the effects of different durations of short days (SDs) as a dormancy-induction regime on bud development, bud endodormancy, and morphology of first-year containerized coastal douglas fir [Pseudotsuga menziesii (Mirb.) Franco var. menziesii] seedlings in the nursery together with seedling survival and growth after one growing season in a common garden. In early July, four durations of 8-h SDs were applied: 3, 4, 5, and 6 weeks. During the first week of SDs, budscale initiation started and was completed; then initiation of needles for next year's leading shoot (leader) began. Needle initiation was completed 10 weeks after the start of the regime in seedlings given 5 or 6 weeks of SDs and 13 weeks for those given 3 or 4 weeks of SDs. In early October, duration of SDs had no effect on bud endodormancy; 50% to 88% of terminal buds were endodormant. On this date, seedling height and shoot dry weight were unaffected by duration of SDs, whereas root dry weight and shoot diameter were significantly reduced in seedlings given 6 weeks of SDs compared with other durations. After one growing season, duration of SDs had no effect on seedling survival, leader length, shoot dry weight, root dry weight, or shoot diameter. We recommend the 3-week duration of SDs for coastal douglas fir crops.
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Bi, Yinli, Linlin Xie, Zhigang Wang, Kun Wang, Wenwen Liu, and Wenwu Xie. "Arbuscular mycorrhizal symbiosis facilitates apricot seedling (Prunus sibirica L.) growth and photosynthesis in northwest China." International Journal of Coal Science & Technology 8, no. 4 (2021): 473–82. http://dx.doi.org/10.1007/s40789-021-00408-6.

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AbstractArbuscular mycorrhizal (AM) fungi can successfully enhance photosynthesis (Pn) and plants growth in agricultural or grassland ecosystems. However, how the symbionts affect species restoration in sunlight-intensive areas remains largely unexplored. Therefore, this study’s objective was to assess the effect of AM fungi on apricot seedling physiology, within a specific time period, in northwest China. In 2010, an experimental field was established in Shaanxi Province, northwest China. The experimental treatments included two AM fungi inoculation levels (0 or 100 g of AM fungal inoculum per seedling), three shade levels (1900, 1100, and 550 µmol m−2 s−1), and three ages (1, 3, and 5 years) of transplantation. We examined growth, Pn, and morphological indicators of apricot (Prunus sibirica L.) seedling performances in 2011, 2013, and 2015. The colonization rate in mycorrhizal seedlings with similar amounts of shade is higher than the corresponding controls. The mycorrhizal seedling biomass is significantly higher than the corresponding non-mycorrhizal seedling biomass. Generally, Pn, stomatal conductance (Gs), transpiration rate (Tr), and water use efficiency are also significantly higher in the mycorrhizal seedlings. Moreover, mycorrhizal seedlings with light shade (LS) have the highest Pn. WUE is increased in non-mycorrhizal seedlings because of the reduction in Tr, while Tr is increased in mycorrhizal seedlings with shade. There is a significant increase in the N, P, and K fractions detected in roots compared with shoots. This means that LS had apparent benefits for mycorrhizal seedlings. Our results also indicate that AM fungi, combined with LS, exert a positive effect on apricot behavior.
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Goulart, Roseli dos R., Willian C. Terra, Sônia M. de L. Salgado, et al. "Meloidogyne paranaensis and M. exigua alter coffee physiology." Nematology 21, no. 5 (2019): 459–67. http://dx.doi.org/10.1163/15685411-00003226.

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Summary Root-knot nematodes, Meloidogyne spp., cause great losses to coffee crops in Brazil and worldwide. However, little is known about the physiological changes that these pathogens induce in coffee plants. The present work aimed to compare the physiological variables of coffee seedlings (Coffea arabica ‘Catuaí Vermelho IAC 144’) infected with Meloidogyne paranaensis or M. exigua with healthy coffee plants. Nematode-infected plants showed reductions in height and starch content in roots compared to healthy plants. In addition, the infected plants had a reduction in transpiration, stomatal conductance and CO2 concentration. However, only the coffee seedlings infected with M. paranaensis showed reduction in the rate of photosynthesis. Nematode-infected plants had lower leaf contents of P, K, Mn and Fe when compared to healthy plants. However, only coffee seedlings parasitised by M. paranaensis exhibited lower levels of Ca in the leaves. Therefore, M. paranaensis and M. exigua, with emphasis on M. paranaensis, alter the normal coffee seedling physiology.
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Feret, Peter P., and Richard E. Kreh. "Effect of Undercutting on Loblolly Pine Seedling Size and Its Relation to Root Growth Potential." Southern Journal of Applied Forestry 10, no. 1 (1986): 24–27. http://dx.doi.org/10.1093/sjaf/10.1.24.

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Abstract Loblolly pine seedlings undercut using five different treatments extending from July to September exhibited significant alteration of shoot and root biomass. Root growth potential (RGP) (measured by number of new elongating roots) was not significantly altered by undercutting. Undercutting did significantly alter the RGP/root weight ratio and the RGP/shoot weight ratio because of both concomitant changes in root and shoot biomass and changes in seedling physiology. Root growth potential and efficiency of existing old roots to produce new roots were not well correlated with seedling size.
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Smith, Alistair M. S., Alan F. Talhelm, Daniel M. Johnson, et al. "Effects of fire radiative energy density dose on Pinus contorta and Larix occidentalis seedling physiology and mortality." International Journal of Wildland Fire 26, no. 1 (2017): 82. http://dx.doi.org/10.1071/wf16077.

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Climate change is projected to exacerbate the intensity of heat waves and drought, leading to a greater incidence of large and high-intensity wildfires in forested ecosystems. Predicting responses of seedlings to such fires requires a process-based understanding of how the energy released during fires affects plant physiology and mortality. Understanding what fire ‘doses’ cause seedling mortality is important for maintaining grasslands or promoting establishment of desirable plant species. We conducted controlled laboratory combustion experiments on replicates of well-watered nursery-grown seedlings. We evaluated the growth, mortality and physiological response of Larix occidentalis and Pinus contorta seedlings to increasing fire radiative energy density (FRED) doses created using natural fuels with known combustion properties. We observed a general decline in the size and physiological performance of both species that scaled with increasing FRED dose, including decreases in leaf-level photosynthesis, seedling leaf area and diameter at root collar. Greater FRED dose increased the recovery time of chlorophyll fluorescence in the remaining needles. This study provides preliminary data on what level of FRED causes mortality in these two species, which can aid land managers in identifying strategies to maintain (or eliminate) woody seedlings of interest.
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Margolis, Hank A., and David G. Brand. "An ecophysiological basis for understanding plantation establishment." Canadian Journal of Forest Research 20, no. 4 (1990): 375–90. http://dx.doi.org/10.1139/x90-056.

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Forest plantations in the early stages of establishment are considered as hierarchical biological systems, and some implications for the design of research projects and the education of regeneration foresters and scientists are discussed. Since less than optimum environmental conditions convey stress to seedlings, seedlings will in turn exhibit a strain response at either the biochemical, physiological, or morphological level. Environmental conditions in a clear-cut are contrasted with other regeneration niches, and implications for the performance of different plantation species are discussed. The important physiological and biochemical limitations on the absorption of water, nitrogen, and carbon by seedlings during their establishment phase are described. Methods of quantifying stress at the plantation site, including simple ways to separate seedling growth into its different physiological components, are shown. An example of an eastern white pine (Pinusstrobus L.) plantation grown under different levels of soil temperature, fertilization, and brush control is presented to illustrate the concepts. An approach to silvicultural research is proposed that determines the effects of silvicultural treatment on the seedling environment and then relates these environmental conditions to seedling biochemistry, physiology, and growth.
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Dissertations / Theses on the topic "Seedling physiology"

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Logsdon, Charles A. "Mutants of Arabidopsis thaliana exhibiting abnormal gravitropism and seedling plastid development." [Bloomington, Ind.] : Indiana University, 2005. http://wwwlib.umi.com/dissertations/fullcit/3162266.

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Thesis (Ph.D.)--Indiana University, Dept. of Biology, 2005.<br>Title from PDF t.p. (viewed Dec. 2, 2008). Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0146. Chair: Roger P. Hangarter.
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Mahwood, T. "Physiology of metal ion-induced effects on germination and seedling growth in cereals." Thesis, University of Edinburgh, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.657209.

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The effects of zinc, lead and copper ions, at concentrations up to 10 mM, on germination and seedling vigour of wheat, barley and rice were investigated. Percentage germination was unaffected by lead and zinc ions in the three species tested. The highest concentration of copper ions (10 mM) decreased the percentage germination in rice. Rice seedlings were grown in controlled environment cabinets using a nutrient culture technique. A copper ion concentration of 8 μM in the culture solution was found to inhibit the elongation of the longest root. Seedlings were grown in nutrient solutions at pH 5.5, 5.0 and 4.5, and three concentrations of copper ions. The reduction in all the growth parameters was highest at pH 4.5 in all copper ion treatments. The amount of chlorophyll in the uppermost fully-expanded leaves of the seedlings grown at pH 4.5, was considerably less than that in comparable leaves of the control seedlings. The effect of copper ions on root plasma membranes of the seedlings was estimated by measuring K<SUP>+</SUP> leakage from intact roots. A larger amount of K<SUP>+</SUP> leaked from roots when seedlings were incubated with high (16 μM) copper ion concentrations than when seedling roots were incubated in water. Similarly, the effect of copper ions on root lipid peroxidation as measured by TBA-rm(2-thiobarbituric acid-reactive material) accumulation, showed that more TBA-rm was accumulated in copper ion treated roots than in control roots. The effect of various copper ion concentrations on the morphology and ultrastructure of the roots was studied using light and scanning electron microscopy. The results showed that copper ions caused a reduction in the length of the root hair zone and of root hair length, a reduction in the size of the root cells, and initiation of lateral root closer to the root tip, compared to seedlings grown in control solutions.
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Mahmood, Tariq. "Physiology of metal ion-induced effects of germination and seedling growth in cereals." Thesis, University of Edinburgh, 1995. http://hdl.handle.net/1842/12550.

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Bigley, Richard Ernest. "Ecological physiology of conifer seedling and sapling suppression by, and release from, competing vegetation." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28625.

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The overall objective of this thesis was to improve our understanding of the light environment associated with two of the major deciduous competitors of commercial conifer seedlings in low elevation coastal British Columbia, and the physiological response of young conifers to specific environments and changes in the environment. Studies were conducted to investigate: 1) seasonal and herbicide-induced changes in the light regimes beneath the canopies of two brush species, 2) growth and physiology of seedlings of three conifer species in several different deciduous brush environments throughout the year, and 3) changes in the physiology and growth of suppressed conifer saplings when different methods and schedules were used to reduce shading from an overtopping red alder canopy. Seasonal changes in the light quantity and quality were documented within salmonberry (Rubus spectabilis Pursch) and below red alder (Alnus rubra Bong.) canopies. The prediction of light attenuation within salmonberry canopies using the Beer-Lambert law was good for foliated canopies using leaf area index, and defoliated canopies using stem area index. As salmonberry leaf area increased, the ratio of red to far-red light declined exponentially. Growth of grand fir (Abies qrandis (Dougl.) Forbes), western hemlock (Tsuga heterophylla (Raf.) Sarg.) and Douglas-fir (Pseudetsuga menziesii (Mirbel) Franco) seedlings decreased with increases in the canopy density of overtopping deciduous species. Physiological differences between conifer species and differences between overtopping canopy treatments declined in the autumn and winter. Based on the physiological measurements, suppression of the shade intolerant Douglas-fir seedlings was greatly reduced during the period that overtopping deciduous canopies were leafless. Animal damage reduces growth and probably increases the duration seedlings are under overtopping canopies. Suppressed Douglas-fir saplings released from overtopping by red alder canopies showed the greatest growth response when the alder canopies were removed in the spring; complete removal of the alder canopy during the summer had a predictably deleterious effect on the sapling physiology and growth. Herbicide injections resulted in a slower but predictable increase in conifer growth.<br>Forestry, Faculty of<br>Graduate
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Sekharan, Soja. "Aged soybean (Glycine max [L.] Merrill) seeds – their physiology and vigor assessment." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135809134.

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MacAllister, Sarah Louise. "Regeneration of Scots pine (Pinus sylvestris L.) under drought." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/19560.

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Drought-induced tree mortality is a phenomenon affecting many forest ecosystems and is predicted to increase under ongoing climate change. Forest stability partly depends on regeneration: the process of renewing mature forest with subsequent generations. As seedlings are more susceptible to drought effects than mature trees, mortality of the seedling bank can represent a major bottleneck controlling forest structure and species composition. Scots Pine (Pinus sylvestris L.) is the most widely distributed of the Pinus species, covering a broad latitudinal gradient of ecological conditions. The thesis aims to deepen understanding of drought-induced mortality, while analysing intra-specific variation in the phenotypic and metabolic profile of Pinus sylvestris seedlings subjected to drought stress. I also consider the relevance of the results to the broader conceptual framework of drought-induced mortality. The experiments utilise seeds from different populations of origin (provenances) across the north-south axis of the European range of Pinus sylvestris, in order to determine the extent of regeneration capacity in this species under drought. Seeds were collected from different populations (provenances) that, along with other climatic and edaphic differences, span a gradient of water availability: from wet (Scotland) to intermediate (Austria, Poland) to dry (Spain). In Chapter 2, the effects of osmotic stress on the initial seedling establishment stage were studied by comparing phenotypic responses across provenances. Seedling germination, early growth, osmotic stress tolerance and survival were investigated using a polyethylene glycol irrigation treatment as a proxy for rapid and severe drought. Treatment, provenance and interaction effects were found for rate of germination, final proportion of seeds germinated, seedling size, and superoxide dismutase activity (an antioxidant enzyme). Root investment was affected by both provenance and time to germination. Although there was no significant effect of provenance on survival, a trend towards increased probability of survival under osmotic stress was indicated for the southernmost (driest) as compared with the northernmost (wettest) provenance. Chapter 3 investigates the responses of older seedlings (at 10 months) to a drying down of soil moisture for 40 days. Morphological and physiological data were collected to assess intra-specific and intra-population variation in the seedling stress response under drought. A metabolomics analysis using Ultra performance Liquid chromatography followed by mass spectrometry (UPLC/MS) was carried out to investigate whether metabolic markers could be identified that are suggestive of heightened oxidative stress and whether populations in different climatic and edaphic environments show variation in metabolic activity under drought. Preliminary results suggest large intra-population variability yet clear differentiation in metabolic responses to drought over the time course of the experiment. Univariate and multivariate analyses indicated that among the most significant increases in response to drought were those involved in osmoprotective and antioxidant capabilities, including the free amino acid proline and a quercetin derivative (a flavonoid). Interestingly, provenances, either under experimental drought or not, did not show significantly different metabolite profiles, even though provenance and its interaction with drought treatment did significantly affect seedling biomass and photochemical efficiency. In Chapter 4 the effects of provenance, maternal parentage and seed weight on germination rate, final germination percentage, as well as seedling drought responses in biomass allocation and the expression of selected antioxidant genes were analysed. Seed weights were measured individually and seed weight was found to have a strong positive effect on: germination rate, seedling dry weights, and number of needles. Expression of two antioxidant enzymes increased under drought. Seed weight was strongly determined by provenance and maternal parentage as well as their interaction. However, root to shoot biomass allocation depended on provenance and maternal effects that were not mediated by seed weight effects. Principal component analysis indicated that the Spanish provenances could be characterised by a higher root to shoot ratio and stem weight. Specific leaf area was also found to be lowest for the Spanish provenances.
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Sparks, Aaron, Crystal Kolden, Alan Talhelm, et al. "Spectral Indices Accurately Quantify Changes in Seedling Physiology Following Fire: Towards Mechanistic Assessments of Post-Fire Carbon Cycling." MDPI AG, 2016. http://hdl.handle.net/10150/621493.

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Fire activity, in terms of intensity, frequency, and total area burned, is expected to increase with a changing climate. A challenge for landscape-level assessment of fire effects, often termed burn severity, is that current remote sensing assessments provide very little information regarding tree/vegetation physiological performance and recovery, limiting our understanding of fire effects on ecosystem services such as carbon storage/cycling. In this paper, we evaluated whether spectral indices common in vegetation stress and burn severity assessments could accurately quantify post-fire physiological performance (indicated by net photosynthesis and crown scorch) of two seedling species, Larix occidentalis and Pinus contorta. Seedlings were subjected to increasing fire radiative energy density (FRED) doses through a series of controlled laboratory surface fires. Mortality, physiology, and spectral reflectance were assessed for a month following the fires, and then again at one year post-fire. The differenced Normalized Difference Vegetation Index (dNDVI) spectral index outperformed other spectral indices used for vegetation stress and burn severity characterization in regard to leaf net photosynthesis quantification, indicating that landscape-level quantification of tree physiology may be possible. Additionally, the survival of the majority of seedlings in the low and moderate FRED doses indicates that fire-induced mortality is more complex than the currently accepted binary scenario, where trees survive with no impacts below a certain temperature and duration threshold, and mortality occurs above the threshold.
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MacKintosh, Hamish. "Developing the silviculture of continuous cover forestry : using the data and experience collected from the Glentress Trial Area." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7943.

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Continuous Cover Forestry (CCF) has become increasingly popular since the early 1990s. CCF utilises several silvicultural techniques in order to promote and enhance forest structural diversity and favours natural regeneration. As CCF is relatively new to the UK there are still areas of knowledge regarding management interventions that need to be improved upon. This study utilises simple models, seedling physiology and a hybrid gap model and applies them to the Glentress Trial Area which has been under transformation from even-aged forestry since 1952. These efforts have led to an improved understanding of thinning interventions and the effects they may have on future stand structure. Since the formation of the Forestry Commission in 1919, clearfell-replant forestry has been the main form of management practiced in the UK. CCF management differs in several respects and is commonly practiced using expert knowledge in Continental Europe. In the UK the knowledge-base is still growing and therefore simple models can prove useful for guiding management. This study investigated the use of the idealised reverse-J and the Equilibrium Growing Stock (EGS). This study found that the reverse-J shaped diameter distribution is maintained at the Trial, Block and sub- Block scale indicating that an irregular structure is being approached. In addition, the diminution coefficient, a parameter of the reverse-J distribution, falls within values typical of continental Europe. Comparison of the actual diameter-frequency distribution against an ideal reverse-J distribution can inform both thinning intensity and which diameter classes to target. The EGS, which is a volume–diameter distribution, examines standing volume and how that volume is distributed across three broad diameter classes. Typical distributions from the Swiss Jura indicate that percentage volume should be split 20:30:50 across diameter classes. The EGS analysis showed that standing volume in the Trial Area is much lower than European values at just 174 m3 ha-1. In addition, the classic 20:30:50 percent split was not observed. The 1990 data set showed a 49:43:8 distribution but by 2008 it was 40:41:19. As natural regeneration is favoured in CCF a better understanding of seedling physiology is essential. This study established open (15-35 m2 ha-1) and closed canopy plots (>35 m2 ha-1). Plot characteristics were recorded and then seedlings were selected for physical measurements, chlorophyll fluorescence and gas-exchange measurements. There were clear differences between the physical characteristics with a mean Apical Dominance Ratio (APR) of 1.41 for the open plots and 0.9 for the closed plots which is consistent with previous studies suggesting an APR of 1 is needed for successful regeneration. The chlorophyll fluorescence measurements showed a linear relationship with PAR. However, although the results of the gas-exchange measurements showed an increase in photosynthetic rates with PAR for open plots, there was no obvious relationship in the closed plots. As a result, the study did not find a linear relationship between photosynthetic rate and chlorophyll fluorescence. Finally a complex, hybrid gap model was used to investigate the effects of management on predicted future stand structure. The hybrid gap model, PICUS v1.41, was parameterised for Sitka spruce. The model was used to explore different management scenarios on stand structure over two time periods; 1954-2008 and 1952- 2075. The output from the group selection with underplanting scenario, which resembled the actual management, produced realistic output that was comparable to the stand characteristics measured during the 2008 assessment. The output from the 1952-2075 runs suggested that thinning to a residual basal area suitable to allow natural regeneration (<30 m2 ha-1) or a group selection with underplanting were the best management options for maintaining structural diversity.
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Roberts, Jessica Jaye Edna. "Incorporating low relative humidity and low temperatures into tree nursery growing regimes, effects on white spruce seedling growth, morphology and physiology." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ34408.pdf.

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Ertle, John Michael. "Effects of Short-term Chilling Stress on Seedling Quality and Post-transplanting Growth of Grafted and Nongrafted Watermelon." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594742774066127.

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Books on the topic "Seedling physiology"

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Workshop on Seedling Physiology and Growth Problems in Oak Plantings (8th 2001 Hiawassee, Ga.). Eighth Workshop on Seedling Physiology and Growth Problems in Oak Plantings: Hiawassee, Georgia, September 9-12, 2001. North Central Research Station, USDA Forest Service, 2001.

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Workshop on Seedling Physiology and Growth Problems in Oak Plantings (6th 1995 University of Wisconsin--Stevens Point). Sixth Workshop on Seedling Physiology and Growth Problems in Oak Plantings, Rhinelander, Wisconsin, September 18-20, 1995: Abstracts. The Station, 1996.

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Workshop on Seedling Physiology and Growth Problems in Oak Plantings (4th 1989 Columbus, Ohio). Fourth Workshop on Seedling Physiology and Growth Problems in Oak Plantings, Columbus, Ohio, March 1-2, 1989 (abstracts). North Central Forest Experiment Station, USDA Forest Service, 1990.

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Workshop on Seedling Physiology and Growth Problems in Oak Plantings (3rd : 1986 (1986 Carbondale, Ill.). Third Workshop on Seedling Physiology and Growth Problems in Oak Plantings, Carbondale, Illinois, February 12-13, 1986 (abstracts). The Station, 1988.

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Point), Workshop on Seedling Physiology and Growth Problems in Oak Plantings (6th 1995 University of Wisconsin-Stevens. Sixth Workshop on Seedling Physiology and Growth Problems in Oak Plantings, Rhinelander, Wisconsin, September 18-20, 1995: Abstracts. The Station, 1996.

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Duryea, Mary L., and Gregory N. Brown. Seedling physiology and reforestation success: Proceedings of the Physiology Working Group Technical Session. Martinus Nijhoff Publishers, 2011.

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Omi, Steven Katsu. Effects of fall lifting and long-term freezer storage on ponderosa pine seedling physiology and quality. 1990.

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1943-, Isebrands J. G., McCreary D. D, and United States. Forest Service. North Central Research Station, eds. Seventh Workshop on Seedling Physiology and Growth Problems in Oak Plantings, South Lake Tahoe, California, September 27-29, 1998. North Central Research Station, USDA Forest Service, 1999.

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Fifth Workshop on Seedling Physiology and Growth Problems in Oak Plantings: Ames, Iowa, March 4 and 5, 1992 (abstracts). North Central Forest Experiment Station, USDA Forest Service, 1993.

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Shainsky, Lauri J. Competitive interactions between Douglas-fir and red alder seedlings: Growth analysis, resource use, and physiology. 1988.

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Book chapters on the topic "Seedling physiology"

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Bradow, Judith M., and Philip J. Bauer. "Germination and Seedling Development." In Physiology of Cotton. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3195-2_5.

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McDonald, Miller B. "Seed Germination and Seedling Establishment." In Physiology and Determination of Crop Yield. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/1994.physiologyanddetermination.c3.

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Spaeth, Stephen C. "Germination and Seedling Establishment: Discussion." In Physiology and Determination of Crop Yield. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/1994.physiologyanddetermination.c4.

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Bass, L. N., C. R. Gunn, O. B. Hesterman, and E. E. Roos. "Seed Physiology, Seedling Performance, and Seed Sprouting." In Agronomy Monographs. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/agronmonogr29.c31.

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Turley, Rickie B., and Kent D. Chapman. "Ontogeny of Cotton Seeds: Gametogenesis, Embryogenesis, Germination, and Seedling Growth." In Physiology of Cotton. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3195-2_29.

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Rerkasem, B., R. W. Bell, and J. F. Loneragan. "Effects of seed and soil boron on early seedling growth of black and green gram (Vigna mungo and V. radiata)." In Plant Nutrition — Physiology and Applications. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0585-6_47.

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Sung, Shi-Jean S., and Paul P. Kormanik. "Sucrose metabolism, growth and transplanting stress in sweetgum seedling taproots and stems." In The Supporting Roots of Trees and Woody Plants: Form, Function and Physiology. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-3469-1_26.

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Thompson, Gregory A., and Chingying Li. "Altered Fatty Acid Composition of Membrane Lipids in Seeds and Seedling Tissues of High-Saturate Canolas." In Physiology, Biochemistry and Molecular Biology of Plant Lipids. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-017-2662-7_99.

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Quilloy, Fergie Ann, Benedick Labaco, Carlos Casal, and Shalabh Dixit. "Crop Establishment in Direct-Seeded Rice: Traits, Physiology, and Genetics." In Rice Improvement. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66530-2_6.

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Abstract:
AbstractThe changing climate and water availability strongly affect the current state of agricultural production. While the global temperature rises, the occurrence of extreme climatic conditions becomes erratic. This current scenario has driven the development of rice varieties and cultivation practices that require less water and favor mechanization. Although puddled transplanted rice has been more widely used in the past, direct seeding has been gaining popularity in recent years, especially due to its water- and labor-saving features. This technique allows full crop establishment from seeds that were directly sown in the field, thus avoiding puddling, transplanting, and maintaining standing water. Consequently, it offers promising positive environmental effects including decreasing the release of greenhouse gases and increasing water-use efficiency. Historically, rice varieties bred for transplanting are also used in direct seeding, which limits the maximum yield potential of field trials. The success of direct seeding relies strongly on the development of rice varieties with robust crop establishment. Anaerobic germination, seed longevity, and early seedling vigor are the key traits required to achieve this. This chapter expounds on the physiology, molecular mechanisms, genetics, and relevance of the enumerated traits for direct seeding. A brief discussion of breeding for rice varieties with improved germination under direct seeding is also provided.
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Nable, R. O., and J. G. Paull. "Effect of excess grain boron concentrations on early seedling development and growth of several wheat (Triticum aestivum) genotypes with different susceptibilities to boron toxicity." In Plant Nutrition — Physiology and Applications. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0585-6_49.

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Conference papers on the topic "Seedling physiology"

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Kazakova, O. V., L. A. Lomovatskaya, and A. M. Goncharova. "Effect of hydrogen peroxide on the activity of adenylatecyclase signaling components system of cells of the growth zones of root of pea seedling by infection of pathogenic or mutualistic microorganisms." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-244.

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Xie, Yongdong, Guochao Sun, Huiping Liao, and Yi Tang. "Effects of Exogenous Melatonin on Photosynthetic Physiology of Lettuce Seedlings under Salt Stress." In Proceedings of the 2018 3rd International Conference on Advances in Materials, Mechatronics and Civil Engineering (ICAMMCE 2018). Atlantis Press, 2018. http://dx.doi.org/10.2991/icammce-18.2018.18.

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Yan, Caifeng, and Shijie Han. "Effects of sewage-sludge and drought stress on eco-physiology of mongolian pine seedlings." In 2011 International Conference on Consumer Electronics, Communications and Networks (CECNet). IEEE, 2011. http://dx.doi.org/10.1109/cecnet.2011.5769196.

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Lu, Qiyu, Guochao Sun, Ji Liu, and Yi Tang. "Effects of Abscisic Acid on Physiology and Ecology of Pea Seedlings under Cadmium Stress." In Proceedings of the 2018 3rd International Conference on Advances in Materials, Mechatronics and Civil Engineering (ICAMMCE 2018). Atlantis Press, 2018. http://dx.doi.org/10.2991/icammce-18.2018.15.

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Huang, LiNa, Shimin Cheng, Zhenrong Yang, Zengxian Zhao, Zisi Xie, and Shouxing Wei. "Effects of Plant Growth Regulators on the Growth and Resistance Physiology of Banana Planting Big Seedlings." In 7th International Conference on Education, Management, Information and Mechanical Engineering (EMIM 2017). Atlantis Press, 2017. http://dx.doi.org/10.2991/emim-17.2017.116.

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Li, Hongyan, Xun Wang, Lisha Zhong, and Lijin Lin. "Effects of Cutting after Continuous Grafting on Photosynthetic Physiology of Lycopersicon esculentum seedlings under Cadmium Stress." In 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.236.

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Butsanets, P. A., A. S. Baik, I. P. Generozova, and A. G. Shugaev. "Salicylic acid increases resistance to thermal stress of lupine seedlings." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-90.

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Valitova, Yu N. "Cold stress in wheat seedlings: membrane sterols, phospholipids and active oxygen forms." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-93.

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Generozova, I. P. "The protective effect of resveratrol on the morphology of mitochondria of pea seedlings." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-116.

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Kholoptseva, E. S., A. A. Ignatenko, N. S. Repkina, and V. V. Talanova. "The effect of salicylic acid on some physiological parameters wheat seedlings at optimal and low temperatures." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-457.

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Reports on the topic "Seedling physiology"

1

Lockhart, Brian R., Emile S. Gardiner, and Daniel C. (editors) Dey. Tenth workshop on seedling physiology and growth problems in oak plantings. U.S. Department of Agriculture, Forest Service, Northern Research Station, 2008. http://dx.doi.org/10.2737/nrs-gtr-32.

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Lockhart, Brian R., Emile S. Gardiner, and Daniel C. (editors) Dey. Tenth workshop on seedling physiology and growth problems in oak plantings. U.S. Department of Agriculture, Forest Service, Northern Research Station, 2008. http://dx.doi.org/10.2737/nrs-gtr-32.

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Thompson, Janette R., Richard C. Schultz, and J. W. Van Sambeek. Fifth workshop on seedling physiology and growth problems in oak plantings (abstracts). U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1993. http://dx.doi.org/10.2737/nc-gtr-158.

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Weigel, D. R., J. W. Van Sambeek, and C. H. Michler. Ninth workshop on seedling physiology and growth problems in oak plantings (abstracts). U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 2005. http://dx.doi.org/10.2737/nc-gtr-262.

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Sung, S., P. P. Kormanik, W. J. Ostrosina, and J. G. Isebrands. Eighth workshop on seedling physiology and growth problems in oak plantings (abstracts). 2001 September 9-12; Hiwassee, GA. U.S. Department of Agriculture, Forest Service, North Central Research Station, 2002. http://dx.doi.org/10.2737/nc-gtr-224.

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Van Sambeek, J. W., and Merlyn M. Larson. Fourth workshop on seedling physiology and growth problems in oak plantings (abstracts); 1989 March 1-2; Columbus, OH. U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1990. http://dx.doi.org/10.2737/nc-gtr-139.

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Teclaw, Ronald M. Sixth workshop on seedling physiology and growth problems in oak plantings (abstracts); 1995 September 18-20; Tomahawk, WI. U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1996. http://dx.doi.org/10.2737/nc-gtr-182.

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USDA FS. Third workshop on seedling physiology and growth problems in oak plantings, proceedings abstracts; 1986 February 12-13, Carbondale, IL. U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1988. http://dx.doi.org/10.2737/nc-gtr-121.

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McCreary, D. D., and J. G. Isebrands. Seventh workshop on seedling physiology and growth problems in oak plantings (abstracts); 1998 September 27-29; South Lake Tahoe, CA. U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1999. http://dx.doi.org/10.2737/nc-gtr-206.

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