Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 57 for “"Plant resistance"”.
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Deer impact and plant resistance traits
… wellbeing by foraging preferentially on certain plant species. Previous research has shown that high deer density can change the relative abundance of tree species in forest communities. Furthermore, some evidence shows that resistance traits of plants can influence plant photosynthetic ability …
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Constraints on plant resistance and tolerance trade-offs
Plant tissue loss due to herbivory is an important selective force for shaping plant phenotypes (Marquis 1992). Therefore, plants have evolved a variety of mechanisms to mitigate the negative effects of herbivory. Much of what we have learned, to date, on plant responses to their enemies …
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Host plant resistance and epidemiology of Fusarium ear rot in maize.
… rot epidemiology in maize (Zea mays L.) and host plant resistance to Fusarium species causing ear rot, in eastern Canada, through three major groups of experiments. A three-year disease survey that determines the causal agents of maize ear rot in Ontario; a three-year study on the stability of …
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Molecular marker analysis of adult plant resistance to powdery mildew in common wheat
… L.) worldwide. The use of cultivars with resistance to powdery mildew is an efficient, economical and environmentally safe way to control powdery mildew. Race-specific resistance has been extensively used in breeding programs; however, it is ephemeral. Adult plant resistance (APR) to …
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Strawberry Powdery Mildew Caused by Podosphaera aphanis: Fungicide Resistance and Host Plant Resistance
… affects leaves, fruit, and runners of strawberry plants. Infected leaves have reduced photosynthetic capability and infected fruit become unmarketable. Both of these factors translate to economic loss for the grower and therefore merit taking measures to control the disease. One objective of this …
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Validation of Loci Conferring Adult Plant Resistance to Powdery Mildew in Wheat Cultivar Massey and Identification of Diagnostic Molecular Markers
… of wheat (Triticum aestivum L.). Race-specific resistance is easily identified in the field due to its qualitative phenotype and it is easy to incorporate because it is inherited as a single gene. Unfortunately, this type of resistance is easily overcome by the pathogen. Traits associated with …
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Host Plant Resistance in Strawberries to Anthracnose and Colonization of Crown and Root Tissue by Verticillium dahliae and Macrophomina phaseolina
… roots, crowns and leaves which can result in plant mortality. As much as 50 to 60% mortality can occur in one field. Pathogens responsible for such losses include <em>Colletotrichum acutatum (</em>syn.<em>C. nymphaeae), Macrophomina phaseolina </em>and <em>Verticillium dahliae. </em>With the …
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The role of foliar glucosinolates in host plant resistance of oilseed rape and mustard to the Bertha armyworm and the diamondback moth
The relationships between host plant glucosinolates and feeding and growth of a polyphagous insect, the Bertha armyworm, Mamestra configurata Walker and field infestation levels of an oligophagous insect, the diamondback moth, Plutella xylostella L. were investigated. M. configurata reared on eight …
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Control of fusarium head blight in wheat: I. Evaluation of host plant resistance and fungicides II. Molecular markers associated with QTL for resistance
… essential tool for control of FHB. Breeding for resistance to FHB has become a very large part of wheat and barley breeding programs in temperate climates. Various sources of resistance have been used to develop new cultivars that have high levels of resistance. The primary objective of this …
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Validation, Saturation, and Marker-Assisted Selection of Quantitative Trait Loci Conferring Adult Plant Resistance to Powdery Mildew in an Elite Wheat Breeding Population
… have shifted to breeding for more durable resistance, such as "adult plant resistance" (APR). Molecular markers and quantitative trait loci (QTL) associated with APR to powdery mildew must first be validated and QTL effects evaluated in different genetic backgrounds and breeding populations …
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Introgression of the Genes for Sesquiterpene Carboxylic Acid Synthesis From a Wild Tomato, Lycopersicon Hirsutum, Into the Cultivated Tomato for Increased Host -Plant Resistance to Insect Pests
… SCA levels and the DNA combined of individual plants within the phenotypic classes. Bulk segregant analysis was used to identify polymorphic AFLP markers present in LA 1777 and absent in 'Chico III' and LA 1033. Comparisons of these polymorphic AFLP markers between high-SCA bulks and the …
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Evaluation of transgenic, Bt-containing corn hybrids
… control or manage this insect, such as polygenic plant resistance, introduced ECB predators, and chemical insecticides, have had some successes but economic loss to producers is still common. Advances in biotechnology have provided the tools to produce transgenic plants. Transgenic corn hybrids …
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The investigation of a novel proteinase inhibitor as a means to transfer insect resistance to plants
… and predators; utilisation of insect resistant plant varieties; and methods to maximise the advantages of pesticides and minimise their disadvantages. Insect-resistant crop varieties form an important part of IPM. There is usually no extra cost to the farmer once the resistant variety has been …
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Effects of Silicon -Based Fertilizer Applications on the Development and Reproduction of Insect Pests Associated With Greenhouse -Grown Crops
… poinsettia, and fiddleleaf fig did not increase plant growth and development parameters such as moisture content (g), plant height (cm), and the number of mature leaves. The results of these studies clearly demonstrate that applications of silicon-based fertilizers to certain plant species …
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Dissecting the Multifaceted Relationship Between Maize and Cochliobolus carbonum race 1
… virulence. The maize Hm1 gene confers complete resistance to CCR1 at all stages of development by encoding for an NADPH-dependent reductase that inactivates HC-toxin. Hm1A, Hm1-SM1, and Hm1-SM2 are alleles of Hm1 that exhibit an adult plant resistance (APR) phenotype, being fairly susceptible …
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Genetic architecture of multiple disease resistance in one maize chromosome segment substitution line population
… and is grown all over the world. Like other plants, maize is attacked by numerous pathogens. Diseases account for 2 to 15% of maize yield losses annually, and foliar diseases are the most destructive in terms of yield. With an increasing world population, utilizing host plant resistance is an …
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Integrated Multiple-tactic Management of the Redbanded Stink Bug on Soybeans in Louisiana
… to determine the combined effects of host plant resistance and insecticide application, on the abundance of stink bugs and their natural enemies. The soybean cultivar Pioneer 95Y20 had the least pest pressure, seed damage, and yields were higher from these plants. Insecticide application of …
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Molecular insights into arabidopsis response to Myzus persicae sulzer (green peach aphid)
… insects like aphids feed on a variety of crop plants and limit plant productivity. In addition they are vectors for important plant viruses. Efforts to enhance plant resistance to aphids have been hampered by lack of sufficient understanding of mechanisms of plant defense against aphids. I have …
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The dynamics of molecular components that regulate aphid-plant interactions
… losses of crop yield, through draining plant resources and vectoring over 275 plant viruses. In plant-pathogen interactions, basal plant defense involving pathogen associated molecular pattern (PAMP) triggered immunity (PTI) and effector triggered immunity (ETI) effectively fends off the …
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