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Dissertations / Theses on the topic 'Wild oats'

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Published: 4 June 2021
Last updated: 12 February 2022

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1

Mansooji, Ali Mohammad. "Herbicide resistance in wild oats, Avena spp." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phm289.pdf.

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2

Maneechote, Chanya. "Mechanisms of herbicide resistance in wild oats (Avena spp.)." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phm274.pdf.

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Bibliography : leaves 159-184. This study found at least three mechanisms of resistance to the acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicides. A modified target -site was responsible for moderate and high resistance to herbicides at the whole plant level. Enhanced herbicide metabolism and reduced translocation of herbicide to the target site was observed in one resistant biotype each.
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3

Dixon, Peter Allan. "Herbicide resistance in wild oats : genetic variation and ecology." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343857.

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4

Manlove, R. J. "On the population ecology of Avena fatua L." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377141.

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5

Tilsner, Heidy Rose. "Studies on the induction and release of seed dormancy in wild oats (Avena fatua L.)." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26092.

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The induction and release of secondary dormancy by anaerobiosis in genetically pure dormant (AN-51, Mont 73) and nondormant (CS-40, SH-430) lines of Avena fatua L. and the role of alternative respiration in the regulation of its primary and secondary dormancy were studied. These lines differed with regard to the optimal period of anaerobiosis necessary for induction of dormancy and/or the degree (% of seeds acquiring dormancy) and duration of dormancy induced. Secondary dormancy could be induced more effectively in after-ripened seeds of dormant lines than in nondormant lines where only a short-term dormancy could be induced (in 5-7 week old seeds). As with primary dormancy, wild oat biotypes exhibit genetic variability in their secondary dormancy behaviour and factors such as temperature can modify the expression of this trait. The germination stimulants kinetin, isopentenyl adenine, sodium azide, potassium nitrate and ethanol, which break primary dormancy in wild oats, stimulated germination of secondarily dormant seeds (line AN-51). Since these chemicals are structurally diverse, primary and secondary dormancies appear to be regulated by similar mechanism(s). Salicylhydroxamate (SHAM), an inhibitor of alternative respiration, did not inhibit: 1. the respiration of embryos excised from after-ripened or secondarily dormant seeds, 2. the spontaneous release of secondary dormany in nondormant lines or 3. the release of secondary dormancy by a variety of chemicals (except azide), suggesting that alternative respiration is not involved in the induction or release of secondary dormancy. Azide and cyanide released seed dormancy at similar concentrations and treatment durations. While cyanide released primary dormancy in seeds with little after-ripening, azide was effective only in secondarily dormant seeds or seeds with more extensive after-ripening. Both inhibitors stimulated seed respiration to a similar extent. The release of dormancy by cyanide was always preceded by respiratory stimulation, but the latter appeared to be independent of germination. SHAM inhibited both the release of seed dormancy and the stimulation of seed respiration by azide but not by cyanide. Respiration was inhibited only when SHAM was applied concurrently with azide. When applied subsequent to azide treatment, SHAM had no effect. The respiration of seed pre-treated with azide and cyanide was insensitive to SHAM and therefore cannot be alternative. Studies were performed to determine the effect of pH on the stimulation of germination and respiration by cytochrome oxidase inhibitors. Although pH had little effect on seed respiration and germination in controls and in the presence of cyanide, it strongly affected the activity of azide. At pH 5, 1 mM azide inhibited both seed respiration and germination whereas at pH 7 it stimulated both. SHAM at pH 7 did not affect the stimulation of respiration by azide, but inhibited it in the unbuffered system and at pH 5. Thus, SHAM appears to alter azide activity by lowering pH, increasing the concentration of undissociated (active) azide, which then completely inhibits cytochrome oxidase and consequently, seed respiration and germination. The release of dormancy and the stimulation of respiration by cyanide and azide do not appear to be related to the inhibition of cytochrome-mediated respiration or the stimulation of alternative respiration.
Land and Food Systems, Faculty of
Graduate
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6

Antony, Thomas. "Evaluation of black oat (Avena strigosa Schreb) germplasm." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/ANTONY_THOMAS_35.pdf.

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7

Smith, Sally Jane. "A study of gibberellin signalling in wild oat (Avena fatua) aleurone." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388030.

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8

Waterworth, Wanda Melody. "Gibberellin perception in aleurone : photoaffinity labelling and subcellular fractionation studies." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337067.

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9

Dhaliwal, Baljinder Kaur. "Physiological basis of competition between spring barley and wild oat (Avena fatua.L)." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386984.

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10

Mehta, Sonali. "Genetic Investigation of Wild Oat with Acetyl-Coa Carboxylase Gene Sequence Variation." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/27052.

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Wild oat (Avena fatua) is a grass weed species that infests cropland. Common post-emergent herbicides for controlling wild oat are those that inhibit acetyl-CoA carboxylase (ACCase) and acetolactate synthase (ALS). Variation among plastidic ACCase gene sequences of herbicide-susceptible wild oat biotypes USDA96 and KYN119 revealed ACCase gene diversity consistent with possible separate diploid ancestry, with KYN119 more likely to share diploid ancestry with herbicide-resistant UM1. USDA96 wild oat shows low-level tolerance to the ALS-inhibiting herbicide flucarbazone, and the inheritance of this tolerance was studied among F3 families generated from KYN119 and USDA96 reciprocal crosses. Quantitative inheritance was observed at the below-label flucarbazone rate of 1.81 g ai/ha. Some F3 families had higher post-treatment main shoot dry weights than either parent, which may be due to heterosis and/or genetic contributions from both parents. No evidence for association between the Acc1;1 ACCase gene and low-level tolerance to flucarbazone was observed.
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11

Nietschke, Brett Steven. "Integrated strategies for wild oat (Avena spp.) management in southern Australian farming systems." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phn677.pdf.

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Bibliography: leaves 128-146. Study was undertaken to determine the occurence and species incidence of wild oats in a major cropping region of southern Australia. Population dynamic studies were undertaken at two sites to define the seed bank decline and emergence pattern of several wild oat populations over a three year period. Management studies were conducted to determine appropriate strategies for the control of wild oats in southern Australian farming systems.
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12

Shepherd, Sophie. "Genotype and environment interactions of seed dormancy in wild oat (Avena fatua L.)." Thesis, University of Reading, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427855.

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13

Anaka, Kurt James. "A study of wild oat, green foxtail, and barnyardgrass associations in an arable field." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0028/MQ51681.pdf.

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14

Leckie, Debra. "The genetical control of the response of wheat to the wild oat herbicide difenzoquat." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315045.

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15

Rajapakse, Janakie Chintha. "Comparison of ACCase inhibitor resistance levels in five wild oat populations (Avena sterilis L. ludoviciana Durieu) /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18868.pdf.

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16

Jones, Huw Dylan. "The role of G-proteins in intracellular signalling mechanisms of wild oat (Avena fatua) aleurone." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337173.

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17

Shirtliffe, Steven J. "The effect of chaff collection on the combine harvester dispersal of wild oat (Avena fatua L.)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ41627.pdf.

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18

Rethwisch, Michael D., and Nelson John E. "Evaluation of Raptor 1AS and Other Herbicides for Sowthistle, Canarygrass, and Wild Oat Control in Alfalfa." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/204094.

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Two rates of Raptor herbicide were evaluated for late winter weed control in alfalfa in combination with various types of surfactancts, the insecticide Furadan, and other alfalfa herbicides with known limited control spectrums. Herbicides that were combined with Raptor were also evaluated separately, as was Pursuit. Effects of treatments on wild oats, littleseed canarygrass and annual sowthistle were obtained. Treatments containing the active ingredient clethodim (Select/Prism) reduced canarygrass height and reproduction, while Raptor treatments increased numbers of inflorescences. No treatment provided effective control of sowthistle although some activity was noted from the Raptor treatments when numbers of reproductive structures and height were examined. Surfactants/ adjuvants greatly increased Raptor activity. Wild oat control was noted in treatments containing clethodim and several Raptor treatments when utilizing a surfactant/adjuvant.
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19

Hanson, Morgan D'Ann. "Triallate Efficacy to Suspected Herbicide Resistant Wild Oat (Avena fatua L.) in Spring Wheat (Triticum aestivum L.)." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28145.

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Herbicide-resistant weed populations have increased because of continuous use of the same grass herbicides. Several collections of wild oat with resistance to ACCase and ALS herbicides have been documented in North Dakota, leaving limited options for control. Two field experiments were conducted to evaluate the efficacy of triallate to control wild oat and determine spring wheat cultivar tolerance to triallate. Injury was not observed until twice the field rate of triallate was applied. Two greenhouse experiments were conducted to characterize 56 suspected resistant wild oat samples and determine triallate efficacy. Wild oat samples were characterized into three subgroups. Triallate provided at least 92% control of all wild oat samples within each subgroup; therefore, integrating triallate back into North Dakota cropping systems is an option to control wild oat in cereal production.
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20

Gray, Myron Crowley. "An investigation into the role of genetics in the tolerance of Texas live oaks to Ceratocystis fagacearum." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1360.

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21

Allvin, Elin. "Dubbla brott : Kvinnan som mördar hos Joyce Carol Oates/Rosamond Smith." Thesis, Uppsala universitet, Litteraturvetenskapliga institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155293.

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22

O'Donnell, Chris. "The response of Avena fatua to the enhanced greenhouse effect /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17124.pdf.

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23

Marginet, Anastasia Maria. "Effect of tillage system and eco-regional field location cluster on the emergence periodicity of wild oat and green foxtail." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62789.pdf.

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24

Callow, Kristen Aileen. "Performance of wild oat (Avena fatua L.), wheat and flax in direct-seeding systems in relation to monoammonium phasphate and potassium chloride rate and placement." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ41685.pdf.

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25

Redai, Haile Ghiorghis. "Nutritional aspects of the interaction between winter wheat (Triticum aestivum L.) and the weeds wild oat (Avena patua L.) and barren brome (Bromus sterilis L.)." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46523.

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26

Taylor, Joseph Michael. "Establishing a membership class that will introduce new and prospective members of Southern Oaks Baptist Church to foundational biblical doctrines and membership expectations." Theological Research Exchange Network (TREN), 1994. http://www.tren.com.

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27

Lepais, Olivier. "Dynamique d'hybridation dans le complexe d'espèces des chênes blancs européens : chênes pédonculés - Quercus robur L., sessiles - Q. petraea (Matt.) Liebl., pubescents - Q. pubescens Willd. et tauzins - Q. pyrenaica Willd." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13624/document.

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L’hybridation est un processus aux conséquences diverses sur l’évolution des espèces qui est difficile à étudier lorsque les espèces se distinguent mal au niveau morphologique. Afin de comprendre le rôle de l'hybridation dans l’évolution du complexe d’espèces des chênes blancs européen, nous avons utilisé des outils de la génétique des populations pour quantifier les flux de gènes interspécifiques contemporains et étudier le système de reproduction de quatre espèces. Un protocole d'analyse génétique rapide a été développé et des méthodes d’assignations génétiques, permettant de déterminer l’espèce de chaque arbre et d’identifier les hybrides, ont été testées par simulations. Cette méthode a été appliquée en populations naturelles révélant un pourcentage d'hybrides variant de 10 à 30% en fonction des populations et impliquant tous les couples d'espèces. Nous avons montré que les effectifs des espèces dans les parcelles influencent la dynamique d'hybridation et la directionalité de l'introgression. Nous avons étudié le système de reproduction de ces espèces en croisements contrôlées et en forêt pour expliquer le maintien des espèces malgré la présence de flux de gènes interspécifiques. L'existence de plusieurs barrières reproductives contribue à un isolement partiel des espèces qui dépend principalement de barrières pré-reproductives et prézygotiques. Une analyse de paternité pratiquée sur des descendances récoltées en forêt montre que l'hybridation de première génération est rare mais que ces hybrides F1 sont fertiles et se reproduisent principalement avec l'une des espèces parentales, produisant de nombreux rétrocroisements qui expliquent le fort pourcentage d'hybrides observé dans les populations naturelles étudiées. L'hybridation et l'introgression sont donc des processus à l'œuvre chez les chênes qui contribuent à l'évolution du complexe d'espèces
Hybridisation is a complex process with diverse consequences on species evolution. Hybridisation is difficult to study when species are not clearly morphologically distinguished. Our aim was to study the role of hybridisation in the evolution of the European white oak species complex. We used population genetic tools to quantify contemporary interspecific gene flow and to study the mating system of four oak species. A fast genetic analysis protocol was developed and genetic assignment methods were first tested by simulation and then used to determine the species of each tree and to identify hybrids. These methods revealed that hybrid percentages were between 10 to 30% depending on the natural population studied and that all species pairs were involved. We showed that the census number of species in the stands had an influence on hybridisation dynamics and on introgression direction. We studied the mating system of these species in controlled crosses and in the forest to understand the maintenance of species despite interspecific gene flow. Several reproductive barriers contribute to a partial isolation of species, mostly pre-reproductive and prezygotic. A paternity analysis of maternal progenies sampled in the forest showed that first generation hybridisation was rare but that F1 hybrids were fertile and were mating mostly with one of the two parental species, creating numerous backcrosses that explain the high percentages of hybrids observed in the natural populations studied. Hybridisation and introgression are active processes in oaks and contribute to the evolution of the species complex
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28

Fox, Stephen L. "Crown rust resistance in wild oats : presence, inheritance, and interspecific gene transfer to common oats." 1989. http://hdl.handle.net/1993/17104.

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29

Zegeye, Taye. "Crown rust resistance in wild oats : inheritance and screening study." 1994. http://hdl.handle.net/1993/18626.

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30

Pfleeger, Thomas G. "Effects of single and multiple stressors on communities of wheat and wild oats." Thesis, 1998. http://hdl.handle.net/1957/33721.

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Most plant toxicology tests developed in support of environmental laws use a single stress applied to an individual plant. While tests using individual species or stresses require fewer resources and are easier to interpret, they are under increasing criticism for being unrealistic and missing important ecological interactions. The objective of this research was to increase our understanding of how plants and plant communities respond to a variety of stressors. Model plant communities of spring wheat (Triticum aestivum) and wild oats (Avena fatua) were planted at three densities and five proportions in the field. Puccinia recondita, the causal agent of wheat leaf rust, was inoculated on half of the plots. Disease severity was estimated as percent of wheat flag leaves covered by rust lesions. Plants were harvested at maturity and measured. Seeding density rarely had a significant influence on rust severity, probably because tiller density differed little as a result of compensation due to increased tillering at low seeding densities. In contrast, increasing the proportion of wheat in mixtures with wild oats consistently increased wheat leaf rust severity. There was no evidence to suggest that wild oats acted as a barrier to inoculum movement. Wild oats' effect on wheat leaf rust was probably through its competitive reduction of wheat tiller density. Both wheat and wild oats seed weight decreased as the proportion of wild oats increased in mixtures. This indicates that intraspecific competition was stronger in wild oats than was intraspecific competition with wheat in these mixtures. Wild oats generally did not respond to the presence of leaf rust on wheat, while wheat was negatively impacted. Thus, there was little competitive advantage to wild oats when its competitor (wheat) was diseased. A small subset of the field treatments was treated with ozone, because of the limited space available in the open-top ozone exposure chambers. Wheat height and aboveground biomass generally decreased with ozone exposure and with increasing disease severity in both years, while total grain weight decreased significantly only with disease and only in one year. There was no interaction between ozone and disease, regardless of cultivar, density, or plant response variable measured. There was little evidence that ozone exposure affected the severity of wheat leaf rust. In general, there seemed to be a lack of interactions among the different stressors and the results varied considerably depending on year and wheat cultivar.
Graduation date: 1998
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31

Polziehn, Kristina. "Wild oat population dynamics within integrated weed management systems." Master's thesis, 2011. http://hdl.handle.net/10048/1690.

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Integrating cultural weed management practices with herbicides is an important strategy to reduce wild oat (Avena fatua L.) populations in Alberta, Canada. The purpose of this thesis is to expand the knowledge on wild oat seed banks and seedling emergence within integrated weed management systems. Field experiments were conducted from 2006-2007 to examine the impact of crop rotation, barley cultivar, barley seeding rate and herbicide rate on wild oat seed bank density, seed mortality, seedling emergence and seedling survivorship. Management systems consisting of diverse crop rotations, tall barley cultivars and increased barley seeding rates reduced wild oat seed bank density, seedling emergence and seedling survivorship, especially at low herbicide rates. Wild oat seed banks predicted subsequent wild oat emergence, whereas biomass and emergence strongly predicted seed banks. Lastly, 50% wild oat emergence was achieved at 537 and 509 growing degree days in 2006 and 2007, respectively, in Lacombe, Alberta.
Plant Science
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32

Bourgeois, Luc. "ACCase inhibitor resistant wild oat in Manitoba : prediction, identification, and characterization." 1997. http://hdl.handle.net/1993/7393.

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High use of aryloxyphenoxypropionate (APP) and cyclohexanedione (CHD), collectively referred to as acetyl coenzyme A carboxylase (ACCase) inhibiting or Group 1 herbicides, has led to the selection of resistant wild oat (Avena fatua) populations in some regions of Manitoba. The first objective of this thesis was to determine areas of Manitoba at low, medium, and high risk of developing Group 1 resistance. This objective was achieved by using data included in the Manitoba Crop Insurance Corporation (MCIC) database. Low, medium, and high risk areas were those in which Group 1 herbicides were sprayed on less than 30%, 30 to 50%, and over 50% of the sprayed fields, respectively. Results showed that Group 1 herbicide use increased from 15 to 50% of the sprayed fields between 1981 and 1993. Almost 40% of the townships were at high risk between 1989 and 1993. Wild oat seeds were collected in fields from different risk areas with the second objective of determining the proportion of fields infested with resistant wild oat. In a high risk township, resistant wild oat occurred in 20 out of 30 surveyed fields. In general, Group 1 resistant wild oat were more common in high risk townships than in medium or low risk townships. Finally, the third objective was to characterize resistant wild oat lines according to cross-resistance patterns and to determine which one, if any, is the most common. Cross-resistance levels were based on seed-bioassay, and more specifically on the coleoptile length. Three types of cross-resistance were established. The first type included wild oat lines with high levels of resistance to the APP and CHD chemical families. The second type included lines with low levels of resistance to both chemical families, while the third type included lines with high levels of resistance to APP's but almost no resistance to CHD's. More than one type was found in some fields which indicates independent selection of several mutants within a field. Overall wild oat types with high levels of resistance to both chemical families were the most common.
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33

Murray, Bruce Gordon. "Inheritance and pollen mediated gene flow of acetyl-CoA carboxylase inhibitor resistance in wild oat (Avena fatua)." 1996. http://hdl.handle.net/1993/19304.

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34

Gillespie, Scott. "Weed management in reduced-input no-till flax production." Thesis, 2006. http://hdl.handle.net/1993/278.

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The goal of the project was to enhance the period of weed growth prior to seeding in order to reduce weed emergence and weed competition after the crop has been planted. Weed growth was stimulated using either light tillage or by applying nitrogen fertilizer early in the spring. Light disturbance significantly increased pre-seed weed emergence while early applied nitrogen did not appear to have an effect. Post seeding weed emergence levels and weed biomass were similar among the light tillage and early nitrogen treatments. Therefore the goal of decreasing weed competition after seeding was not attained. Future research should focus on long-term strategies to reduce weed populations in field rather than seasonal strategies.
October 2006
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