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Dissertations / Theses on the topic 'Wheat Disease and pest resistance'

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Published: 4 June 2021

Last updated: 21 February 2023

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1

Golegaonkar, Prashant G. "Genetic and molecular analysis of resistance to rust diseases in barley." Thesis, The University of Sydney, 2007. http://hdl.handle.net/2123/3549.

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The responses of 92 barley genotypes to selected P. hordei pathotypes was assessed in greenhouse tests at seedling growth stages and in the field at adult plant growth stages to determine known or unknown resistances. On the basis of multipathotype tests, 35 genotypes were postulated to carry Rph2, Rph4, Rph5, Rph12, RphCantala alone or combinations of Rph2 + Rph4 and Rph1 + Rph2, whereas 52 genotypes lacked detectable seedling resistance to P. hordei. Five genotypes carried seedling resistance that was effective to all pathotypes tested, of which four were believed to carry uncharacterised re

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2

Golegaonkar, Prashant G. "Genetic and molecular analysis of resistance to rust diseases in barley." University of Sydney, 2007. http://hdl.handle.net/2123/3549.

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Doctor of Philosophy<br>The responses of 92 barley genotypes to selected P. hordei pathotypes was assessed in greenhouse tests at seedling growth stages and in the field at adult plant growth stages to determine known or unknown resistances. On the basis of multipathotype tests, 35 genotypes were postulated to carry Rph2, Rph4, Rph5, Rph12, RphCantala alone or combinations of Rph2 + Rph4 and Rph1 + Rph2, whereas 52 genotypes lacked detectable seedling resistance to P. hordei. Five genotypes carried seedling resistance that was effective to all pathotypes tested, of which four were believed to

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3

Wilkes, Meredith Ann. "The Role Of Hydroxamic Acids In Take-all Resistance." Thesis, The University of Sydney, 1997. https://hdl.handle.net/2123/27618.

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The occurrence of hydroxamic acids (Hx) and their affects on take-all have been investigated in this study. An improved HPLC procedure for the separation and quantification of Hx in wheat, rye and triticale roots was established. This method completely separated 2,4-Dihydroxy—1,4— benzoxazin—3-one (DIBOA), 2 , 4-Dihydroxy - 7- methoxy - 1 4- benzoxazin -3-one (DIMBOA), 2(3)-benzoxazolinone (BOA) and 6- methoxybenzoxazolinone (MBOA) within 17 min. DIMBOA was the only Hx found in wheat roots, whereas both DIMBOA and DIBOA were present in the roots of triticale and rye. The Hx content o

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4

Wellings, Colin Ross. "Host: pathogen studies of wheat stripe rust in Australia." Thesis, Department of Agricultural Genetics and Biometry, 1986. http://hdl.handle.net/2123/14544.

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5

Horn, Marizanne. "Transfer of genetic resistance to the Russian wheat aphid from rye to wheat." Thesis, Stellenbosch : Stellenbosch University, 1997. http://hdl.handle.net/10019.1/55770.

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Thesis (MSc.) -- Stellenbosch University, 1997.<br>ENGLISH ABSTRACT: An octoploid triticale was derived from the F1 of a Russian wheat aphid resistant rye, 'Turkey 77', and 'Chinese Spring' wheat. The alloploid was crossed (a) to common wheat, and (b) to the 'Imperial' rye to 'Chinese Spring' disomic addition lines. F2 progeny from these crosses were tested for Russian wheat aphid resistance and C-banded. Resistance was found to be associated with chromosome arm 1RS of the 'Turkey 77' rye genome. This initial work was done by MARAIS (1991) who made a RWA resistant, monotelosomic 1RS (

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6

Galagedara, Nelomie Nayanathara. "Identification of Quantitative Trait Loci for Resistance to Tan Spot in Durum Wheat." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28765.

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Tan spot, caused by Pyrenophora tritici-repentis (Ptr), is a major foliar disease on wheat. The pathosystem involves three pairs of necrotrophic effector (NE) and host sensitivity (S) gene interactions, namely Ptr ToxA-Tsn1, Ptr ToxB-Tsc2 and Ptr ToxC-Tsc1. Additionally, genetic factors conferring race-nonspecific resistance have been identified. The objectives of this study were to map tan spot resistance QTL and investigate the role of NE-S interactions in disease in durum using association and bi-parental mapping. Evaluation of a worldwide collection of durum accessions allowed identifying

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7

Njom, Henry Akum. "Mechanism and synchronicity of wheat (Triticum aestivum) resistance to leaf rust (Puccinia triticina) and Russian wheat aphid (Duiraphis noxia) SA1." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/2700.

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Wheat (Triticum aestivum and T. Durum) is an extremely important agronomic crop produced worldwide. Wheat consumption has doubled in the last 30 years with approximately 600 million tons consumed per annum. According to the International Maize and Wheat Improvement Center, worldwide wheat demand will increase over 40 percent by 2020, while land as well as resources available for the production will decrease significantly if the current trend prevails. The wheat industry is challenged with abiotic and biotic stressors that lead to reduction in crop yields. Increase knowledge of wheat’s biochemi

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8

Ramburan, Viresh Premraj. "Genetic mapping of adult plant stripe rust resistance in the wheat cultivar Kariega." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53438.

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Thesis (PhD (Agric)) -- Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: Stripe (yellow) rust of wheat, caused by Puccinia striiformis f.sp. tritici, was first detected as a single introduction into South Africa in 1996. Two additional pathotypes have since been identified. Control of the disease may be achieved by use of genetic adult plant resistance (APR) as is present in the local cultivar 'Kariega'. The aim of this project was to understand the genetic basis of the APR in 'Kariega' to facilitate breeding of new varieties with genetic resistance to stripe rust. A partial linkage

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9

Bierman, Anandi. "Mapping and survey sequencing of Dn resistance genes in Triticum aestivum L." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96912.

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Thesis (PhD)--Stellenbosch University, 2015<br>ENGLISH ABSTRACT : Diuraphis noxia Kurdjumov (Russian Wheat Aphid; RWA) is a pest of wheat and barley that has spread from its home range in the fertile crescent to most wheat producing countries except Australia. Since its first introduction to South Africa and the USA in the late 20th century, breeding programs for wheat phenotypes resistant to the aphid were put in place. Conventional breeding practices rely on phenotypic screening to verify traits carried by offspring and genetic tools such as marker assisted selection (MAS) have greatly aide

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10

Khan, Imtiaz Ahmed. "Utilisation of molecular markers in the selection and characterisation of wheat-alien recombiant chromosomes." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phk451.pdf.

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Bibliography: leaves 137-163. his is a comprehensive study of induced homoeologous recombination along most of the complete genetic length of two homoeologous chromosomes in the Triticeae (7A of common wheat and 7Ai of Agropyron intermedium), using co-dominant DNA markers. Chromosome 7Ai was chosen as a model alien chromosome because is has been reported to carry agronomically important genes conferring resistance to stem rust and barley yellow dwarf virus on its short and long arms, respectively.

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11

Sharma, Sapna. "Genetics of Wheat Domestication and Septoria Nodorum Blotch Susceptibility in Wheat." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/29767.

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T. aestivum ssp. spelta Iranian type has long been thought to potentially be the direct non-free threshing hexaploid progenitor. I evaluated a RIL population derived from a cross between CS and Iranian spelta accession P503 to identify loci suppressing free-threshabilty in P503. Identification of QTL associated with threshability in region known to harbor the Tg2A gene, and an inactive tg2D allele supported the hypothesis of Iranian spelta being derived from a more recent hybridization between free-threshing hexaploid and emmer wheat. Parastagonospora nodorum is an important fungal pathogen an

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12

Barnett, Stephen J. "Directed evolution of disease suppressive bacteria : the role of root lesions on take - all diseased wheat." Title page, contents and abstract only, 1998. http://hdl.handle.net/2440/37768.

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Take - all disease ( caused by Gaeumannomyces graminis var tritici, Ggt ) can be suppressed by soil microorganisms after continuous monoculture of wheat ( take - all decline, TAD ). Fluorescent pseudomonads have been implicated in this suppression. Two strategies for controlling take - ail are the in situ development of disease suppressive soil, and / or the application of a biocontrol agent. However, TAD takes up to 10 years to develop after initially high levels of disease, and the performance of bacterial biocontrol agents has been inconsistent. It is not known what environmental factors se

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13

Williams, Kevin John. "Biological and genetic studies of wheat resistance to Heterodera avenae." Title page, summary and contents only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phw7238.pdf.

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14

Scharf, Peter C. "Nitrogen loss inhibitors in intensively managed winter wheat." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52072.

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Several potential pathways exist for significant nitrogen loss from nitrogen fertilizer applied to winter wheat in Virginia. A number of materials have been previously identified which inhibit steps in one or more of these loss pathways. Ammonium polyphosphate, ammonium thiosulfate, dicyandiamide, potassium chloride, and monoammonium phosphate were chosen for use in the present study. They were mixed, singly and in combinations, with UAN solution or urea solution and spring top-dressed on soft red winter wheat. Experiments were conducted over two growing seasons at two locations each season. N

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15

Wessels, Willem Gerhardus. "Mapping genes for stem rust and Russian wheat aphid resistance in bread wheat (Triticum aestivum)." Thesis, Stellenbosch : Stellenbosch University, 1997. http://hdl.handle.net/10019.1/55580.

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Thesis ( MScAgric) -- Stellenbosch University, 1997.<br>ENGLISH ABSTRACT: Stem rust is considered the most damaging of the wheat rusts causing yield losses of more than 50% in epidemic years. Similarly, Russian wheat aphids (RWA) can be regarded as one ofthe most devastating insect pests of wheat. Yield losses due to R W A primarily result from a reduction in plant resources (sucking plant sap). Secondary losses are incurred by viruses transmitted during feeding. Mapping disease and insect resistance genes that are effective against prevailing pathotypes and biotypes of South Africa will

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16

Harilal, Vibin Eranezhath. "Genetics and Quantitative Trait Loci Mapping of Septoria Tritici Blotch Resistance, Agronomic, and Quality Traits in Wheat." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/26478.

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Most breeding programs aim at developing superior germplasm and better cultivars that combine high yield, disease and pest resistance, and end-use quality to satisfy the requirements of the growers as well as industry. A population, consisting of 138 F2-8 recombinant inbred lines (RILs) derived from a cross between ‘Steele-ND’ and ND 735, was evaluated to study the inheritance pattern of the septoria tritici blotch (STB)-resistant genes, agronomic and quality traits. The framework map made of 392 markers, including 28 simple sequence repeat (SSR) markers and 364 DArT markers, spanned a total d

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17

Smit, Corneli. "Pyramiding of novel rust resistance genes in wheat, utilizing marker assisted selection and doubled haploid technology." Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85613.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Wheat rust, caused by the Puccinia spp., is a global biotic cause of wheat yield losses. This disease can effectively be combatted by implementing rust resistant wheat cultivars. The release of new resistant wheat cultivars is however prolonged due to the time needed to fix resistance genes in a good quality background and develop pure breeding wheat lines. The aim of this study was the pyramiding of novel species derived leaf and stripe rust resistance genes in bread wheat lines through the utilization of high throughput marker

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18

Springfield, Lezaan Sevone. "Pyramiding of rust resistance genes in wheat utilizing male sterility mediated marker-assisted recurrent selection." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96086.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Wheat production is globally affected by several different wheat rust diseases. The rust diseases can effectively be controlled by the deployment of multiple resistance genes that confer durable resistance. One of the most effective strategies to incorporate resistance genes is by the implementation of recurrent mass selection as it maximizes opportunities for gene pyramiding. The implementation of a recurrent mass selection program in wheat can effectively be enhanced with the use of genetic male sterility and the incorporation

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19

Heyns, I. C. "Mapping and restructuring of an Ae. kotschyi derived translocation segment in common wheat." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5172.

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Thesis (PhD (Genetics))--University of Stellenbosch, 2010.<br>Includes bibliography.<br>ENGLISH ABSTRACT: The wild relatives are an important source of new genes for the genetic improvement of wheat. At Stellenbosch University the leaf and stripe rust resistance genes Lr54 and Yr37 were transferred from Aegilops kotschyi to chromosome 2DL of wheat. In an attempt to reduce the size of the whole-arm translocation on which the resistance genes occur, homoeologous pairing was induced between the wheat and corresponding Ae. kotschyi chromatin. The purpose of this study was to: (i) Evaluate th

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Eksteen, Aletta. "Ontwikkeling van molekulere merkers vir wilde-spesie-verhaalde weerstandsgeenkomplekse van gewone koring." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2087.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2009.<br>Worldwide, the rust diseases cause significant annual wheat yield losses (Wallwork 1992; Chrispeels & Sadava 1994). The utilization of host plant resistance to reduce such losses is of great importance particularly because biological control avoids the negative environmental impact of agricultural chemicals (Dedryver et al. 1996). The wild relatives of wheat are a ready source of genes for resistance to disease and insect pests. A large degree of gene synteny still exists among wheat and its wild relatives (Newbury & Paterson 2003).

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21

Chung, Young-Soo. "Inheritance of powdery mildew resistance genes in 10 winter wheat lines." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/38655.

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22

Vanstone, Vivien Alison. "The role of fungi and the root lesion nematode, Pratylenchus neglectus, in damaging wheat roots in South Australia." Title page, summary and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phv281.pdf.

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Includes bibliographical references (leaves 265-296). Pathogens associated with root damage were investigated in the Murray Mallee region of South Australia over the 1987-1989 growing seasons. Occurence of fungal species and the root lesion nematode (Pratylenchus neglectus) was assessed, and related to the appearance and severity of symptoms on the roots. Field experiments were supplemented with innoculation tests in the glasshouse and laboratory.

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Heyns, I. C. "Mapping of chromosome arm 7DL of Triticum aestivum L." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1584.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2005.<br>The Russian wheat aphid, Diuraphis noxia (Mordvilko), is a serious insect pest of wheat and barley. It affects the quality and yield of grain by sucking plant sap from the newest growth whilst toxic substances are injected that destroy plant tissue. The Russian wheat aphid also acts as a vector of plant viruses. The cultivation of aphid resistant cultivars is the preferred control strategy and nine resistance genes, designated Dn1 to Dn9, have been identified. Another undesignated gene, Dnx, was found in the wheat accession PI2

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Groenewald, Johannes Zacharias. "Tagging and mapping of prominent structural genes on chromosome arm 7DL of common wheat." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52474.

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Thesis (PhD (Agric)) -- Stellenbosch University, 2001.<br>ENGLISH ABSTRACT: Chromosome arm 7DL of common wheat carries genes for agronomically important traits such as leaf rust, stem rust, Russian wheat aphid and eye spot resistance. Some of these genes occur on introgressed foreign chromatin, which restricts their utility in breeding. The 7DL genetic maps are poorly resolved, which seriously hampers attempts to manipulate the genes and introgressed regions in breeding. This dissertation represents an attempt to improve our knowledge of the relative map positions of three resistance gen

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Sacranie, Sattar Farouk. "An investigation on the effect of Russian wheat aphid (Diuraphis noxia Kurdjumov) population growth and feeding damage on selected barley (Hordeum vulgare L.) cultivars under ambient and elevated CO2." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/50311.

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The Russian wheat aphid (RWA) (Diuraphis noxia Kurdjumov) is a major pest of cultivated small grains. It is particularly devastating because of is high reproductive rate which results in the growth of large populations which become damaging to its host plants. Development of resistant barley (Hordeum vulgare L.) cultivars is complicated as resistance is polygenic. As a result, the industry remains at risk now that the RWA has spread throughout South Africa. It has, as recently as, 2013, been identified in the SW Cape, which was previously geographically isolated. This is South Africa‟s princip

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Ntushelo, Khayalethu. "Comparative studies on genetic variability and fungicide resistance in Tapesia yallundae." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/55834.

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Thesis (MScAgric)--Stellenbosch University, 1998.<br>ENGLISH ABSTRACT: Eyespot is an important disease of spring wheat (Triticum aestivum L.). Four species of Ramulispora are associated with this disease, of which Tapesia yallundae and T. acuformis. are common. This thesis investigates the broader subjects of genetic variability, reproductive dynamics and fungicide resistance in Tapesia yallundae. Each of the chapters treats specific but related topics. T. yallundae, which is the only species thus far reported from South Africa, has been associated with yield losses of up to 50%. To ena

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Wessels, Elsabet. "Ontwikkeling van ’n koringkwekery met gestapelde, spesie-verhaalde roesweerstand." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5459.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2010.<br>Includes bibliography.<br>ENGLISH ABSTRACT: Wheat rust is a significant contributor to the total impact of diseases on sustainable wheat production. Genetic resistance, produced by using resistance genes from wheat and other related wild species, is the simplest and most cost-effective way to guard against these diseases. The pyramiding of resistance genes in a single line is a vital practice in bringing about durable resistance. This study aimed to develop a series of doubled haploid (DH) wheat lines containing combination's of wi

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Willey, N. J. "Rust Resistance in Wheat-Diversity and Genetic Studies." Thesis, The University of Sydney, 2011. https://hdl.handle.net/2123/29227.

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This study covered three aspects, namely; assessment of genetic diversity for rust resistance genes among released cultivars, inheritance of adult plant resistance (APR) in two North American wheat cultivars and genetic association between the stern rust resistance gene Sr3 9 and the stripe rust resistance gene YrSp. Queensland and northern New South Wales cultivars carried more diverse gene combinations in comparison to rest of the nation. Genetic diversity for all three rust diseases is a concern in Victoria and South Australia. There is need to release cultivars carrying combinatio

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29

Zwart, Rebecca Susan. "Genetics of disease resistance in synthetic hexaploid wheat /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17369.pdf.

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Elahinia, S. A. "Resistance to wheat to Puccinia striiformis." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384166.

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Loots, Shilo. "Isolation and characterization of Diuraphis noxia induced sequences from wheat line PI 294994." Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/25763.

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Arraiano, Lia Susana. "Genetics of resistance of wheat to septoria tritici blotch." Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390648.

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The research described in this týesis was focused on achieving a better understanding of the genetics of resistance of wheat to septoria tritici blotch (Mycosphaerella graminicola). Firstly, a detached leaf technique that could be a useful complement to field trials and an alternative to whole seedling assays in assessing cultivar resistance and investigating the genetics of the host-pathogen interaction was developed. Sets of inter-varietal substitution lines, developed at the John Innes Centre, involving known and possible sources of resistance to septoria tritici blotch, were tested with se

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Singh, Rampal. "Characterization of virus disease resistance in Lactuca sativa." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55529.

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Little is known about the mechanism of virus disease resistance in plants. The aim of the work presented here was to answer whether disease resistance is offered within the cell or at the level of intercellular movement of the virus. The protoplast system was used for this purpose. Conditions were optimized to isolate viable protoplasts from the leaves of Lactuca sativa cultivars. Protoplasts and leaves from resistant and susceptible Lactuca sativa cultivars were inoculated separately with turnip mosaic virus (TuMV) and lettuce mosaic virus (LMV), Virus multiplication was examined over time us

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Hall, Marla Dale. "Genetic characterization and utilization of multiple Aegilops tauschii derived pest resistance genes in wheat." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/196.

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Pedler, Judith F. "Resistance to take-all disease by Mn efficient wheat cultivars /." Title page, table of contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09php371.pdf.

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Forsström, Per-Olov. "Broadening of mildew resistance in wheat /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences (Institutionen för växtvetenskap, Sveriges lantbruksuniv.), 2002. http://epsilon.slu.se/a336.pdf.

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Shrestha, Subidhya. "Histology of Spot Blotch Infection in Barley, QTL Mapping of Resistance to Fusarium Head Blight, and Characterization of Root Rot Diseases in Wheat." Diss., North Dakota State University, 2017. https://hdl.handle.net/10365/28391.

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Three independent studies were conducted for spot blotch (Bipolaris sorokiniana), Fusarium head blight (FHB) (Fusarium graminearum), and root rot diseases (Fusarium species and B. sorokiniana). Histopathology of compatible and incompatible interactions between different pathotypes of B. sorokiniana and different genotypes of barley was examined with red fluorescent protein-tagged fungal isolates. The fungus penetrated the host cell wall and developed multicellular globular infection hyphae (IH) in the lumen of epidermal cells, but infected epidermal cells appeared to be alive till 16 hours pos

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Wells, Vanessa. "Discovery and Molecular Mapping of Rust Resistance in Wheat." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18829.

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This investigation covers genetics of rust resistance in common wheat and durum wheat. Stripe rust resistance in AUS26615 was conferred by three QTL and these were temporarily named; QYr.sun-1B, QYr.sun-3D and QYr.sun-6B. QYr.sun-1B represented the previously named APR gene Yr29. The other two QTL appear to be new. The detection of QYr.sun-3D in late sown experiment points to its better expression at relatively higher temperature regimes. The all stage resistance gene, YrAW12, carried by AUS26674, was shown to be Yr34 based on its co-segregation with Yr34-linked marker sunKASP_112 and similar

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Bahlmann, Lieschen. "Factors affecting the resistance mechanisms of the Russian wheat aphid (Diuraphis noxia) on wheat." Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/28470.

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Hysing, Shu-Chin. "Genetic resources for disease resistance breeding in wheat : charaterization and utilization /." Alnarp : Department of Crop Science, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200709.pdf.

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Marchione, Wesley A. "Pathogen resistance genes and proteins in orchids." Virtual Press, 2003. http://liblink.bsu.edu/uhtbin/catkey/1260625.

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To study resistance (R) genes that are expressed when Sophrolaeliacattleya Ginny Champion 'Riverbend' orchid tissue was infected with the tobacco mosaic virus (TMV0), a subtraction library of cDNA clones was previously constructed using mRNA isolated before and after infection (Shuck, unpublished). From 200 clones collected, 5 clones were randomly selected, DNA was isolated, and the cDNA insert was sequenced. These sequences were imported into BLAST to search for homology to other R genes. This search revealed clone 4A to have an 84% homology to a 54 nucleotide region from the Arabidopsis thal

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Hague, Rachel Elise. "Genetics of quantitative resistance to powdery mildew in Fenman winter wheat." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267461.

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Parker, Garry David. "Identification of molecular markers linked to quantitative traits and disease resistance genes in wheat (Triticum aestivum L.) /." Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09php239.pdf.

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Ubalijoro, Eliane. "Characterization of resistance to lettuce mosaic virus in Lactuca sativa." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22821.

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Lettuce mosaic virus (LMV) is an economically important pathogen with worldwide distribution. LMV infection in L. sativa can cause significant yield losses. Resistance to LMV in L. sativa is conferred by the recessive gene mo. We attempted to position the mo gene on the L. sativa map. The ultimate goal is a better understanding of plant-virus interactions. To do so, Random Amplified Polymorphic DNA (RAPD) markers were screened in the near isogenic lines (NILs) Vanguard and Vanguard 75. These NILs differ in the presence of the mo gene in Vanguard 75. Polymorphic markers were screened for linkag

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Krenz, Jennifer E. "Specificity of quantitatively expressed host resistance to Mycosphaerella graminicola /." Connect to this title online, 2007. http://hdl.handle.net/1957/3813.

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Melander, Margareta. "Transgenic resistance to pathogens and pests /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a496.pdf.

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Byrne, Katharine. "Gene flow and insecticide resistance in the mosquito Culex pipiens." Thesis, Queen Mary, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244074.

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Reid, Lana M. (Lana Marie). "Resistance of maize silk to Fusarium graminearum." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70316.

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The characteristics and inheritance of maize silk resistance to Fusarium graminearum ear rot were investigated. In an in vitro test, genotypic differences in the degradation of detached silk tissue by F. graminearum were correlated to field evaluations of resistance. Susceptibility to infection decreased with silk age. Total phenolics of silk channel silk tissue increased in response to infection in resistant inbreds but decreased in susceptible inbreds. The flavones iso-orientin, iso-vitexin, maysin, luteolin, and apigenin were identified in the silk. No significant genotype by isolate intera

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Geddes, Jennifer M. H., and University of Lethbridge Faculty of Arts and Science. "Fusarium head blight of barley : resistance evaluation and identification of resistance mechanisms." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2006, 2006. http://hdl.handle.net/10133/399.

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An evaluation of nineteen barley lines using three artificial inoculation methods concluded that spray inoculation was the most reproducible method and provided the greatest discrimination of resistance. Six of the nineteen barley lines were used for proteomic studies to identify defense responses following F. graminearum infection. All lines responded by inducing an oxidative burst and pathogenesis-related proteins. Differences in response magnitude and the proteins activated could be attributed to varying levels of FHB resistance amongst the barley lines. RNA microarray profiling and iTRAQ t

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Wang, Hongxia. "Identification of Molecular Markers Linked to X-Disease Resistance in Chokecherry." Diss., North Dakota State University, 2012. https://hdl.handle.net/10365/26565.

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X-disease, caused by phytoplasmas, is one of the destructive diseases in stone fruit trees, causing yield loss and poor fruit quality. So far no effective methods are available to control X-disease. X-disease resistance has been first discovered in chokecherry (Prunus virginiana, 2n=4x=32), which is a native woody species of North America. To identify molecular markers linked to X-disease resistance, simple sequence repeat (SSR) markers were used to construct genetic linkage maps for chokecherry and to identify markers associated with X-disease resistance in chokecherry. In this research, thre

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