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 72 for “"Plant defense"”.
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Mechanisms Promoting Spatial and Temporal Variability in Plant Defense
Mechanisms responsible for the diversity of plant defenses in natural populations are poorly understood. This dissertation examines how environmental heterogeneity and succession influence the distribution, expression, and adaptive value of resistance and tolerance of goldenrod (Solidago …
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Characterization and Expression of Plant Defense Genes in Peach and Tomato
… tomato fungal pathogen Alternaria solani. The plants were assessed for pathogen susceptibility. Selected beta-glucanase and Mj-AMP lines were more resistant to early blight than non-transformed lines.
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Characterization of Host Plant Defense Responses to Parasitization by <I>Orobanche aegyptiaca</I>
<I>Orobanche</I> (spp.) are parasitic plants that attack the roots of many important crops. <I>O. aegyptiaca</I> penetrates the host root (aided by digestive enzymes) and forms connections to the host vascular tissue, from which it will withdraw all of its water and nutrient requirements. In order …
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Specificity in the ecology and evolution of plant defense against herbivores: Identity and history
… biotic interactions among native and introduced plant ranges may account for the spectacular success of some invasive species. For example, in novel environments plants may experience ecological release from coevolved specialist enemies and may in turn evolve allocation away from costly defense …
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Evaluation of bactericides and plant defense inducers in the presence and absence of onion pathogens Pantoea spp. and Burkholderia gladioli in Colorado
… biological microorganisms (BlightBan A506), and plant defense inducing productions (Actigard and Lifegard). At harvest in year one, the incidence of bacterial rot was not significantly impacted by bactericide treatment since rot was not present in 2020. In 2021, for 'Vaquero' onion, the Kocide …
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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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Hypersensitive Response in Live Oak: Characterization and Efficacy Against a Host of Specific Gall-Forming Wasp
The establishment and spread of host-plant-specific pathogens and insect herbivores are fundamentally affected by plant defenses. Hypersensitive response (HR) is a plant defense classically recognized as resulting from a gene-for-gene interaction between pathogens and plants. More recently HR …
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Molecular Definition of Cytochrome P450 -Mediated Multiple Resistance in Helicoverpa Zea
… levels in midgut and/or fatbody by the plant defense signaling molecules jasmonate and salicylate, by plant defense end products xanthotoxin, idole-3-carbinol, chlorogenic acid, and flavone, and by a synthetic chemical not naturally encountered, phenobarbital. Molecular modeling …
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Isolation and characterization of latex-specific promoters from Papaver somniferum L.
… and analyzed for regulatory elements using the Plant cis-acting regulatory DNA elements database, PLACE (http://www.dna.affrc.go.jp/PLACE). Knowledge of the cis-elements and regulatory regions of LSPs would serve as a tool for metabolic engineering of poppy alkaloids. Sixty-five elements were …
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Phytoecdysteroid accumulation in plants and bioactivities in animal models
Phytoecdysteroids are plant-produced polyhydroxylated steroidal compounds that have valued bioactivities including plant defense against herbivorous insects, and growth and performance-enhancing properties in mammals. In this program of research, phytoecdysteroid accumulation was investigated in …
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HOOKLESS1 REGULATES RESPONSES TO PATHOGENS AND ABSCISIC ACID THROUGH INTERACTION WITH MEDIATOR18 AND ACETYLATION OF WRKY33 AND ABI5 CHROMATIN
… that the loss of function hls1 mutant plants have broad effects on the plant development such as early senescence and flowering, seed insensitivity to ABA as well as plant defense responses including enhanced susceptibility to the necrotrophic pathogen Botrytis cinerea and the …
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A Role for Inositol Pyrophosphates in Arabidopsis Defense Against Herbivorous Insects
… discovered to be implicated in a number of plant pathways such as auxin regulation, phosphate (Pi) sensing, and jasmonate-(JA)-regulated plant defense. Transgenic plants that overexpress inositol tetrakisphosphate 1-kinase (ITPK1) and the kinase domain of the dual domain diphosphoinositol …
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Understanding the impact of Russian wheat aphid-associated microbes on plants
Plant-insect-microbe interactions shape the outcome of plant defense responses, yet the role of aphid-associated bacteria in modulating host susceptibility remains largely unexplored. This dissertation investigates the influence of bacterial communities associated with the Russian wheat aphid (RWA, …
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Alfalfa Aphids From Pixel to Picture: Deciphering Symbiotic and Predatory Interactions Across Scales
… their hosts and modulate the expression of host plant defense. Yet, the potential nutrient- or plant defense-mediated effects of rhizobia on Buchnera have never been examined. The experiments described in chapter 2 show that nutrient-mediated processes can affect Buchnera , and pave the way for …
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Identification and characterization of an adenosine triphosphate binding cassette (ABC) transporter EcABCB1 involved in the transport of alkaloids in Eschscholzia californica
… biotic and abiotic elicitors, which activates plant defense responses. Sanguinarine accumulated in the media is taken up into the cell through a potential active transport process. A large and widely distributed superfamily of proteins found in bacteria, fungi, plants and animals called …
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Determining Putative Secondary Product Glucosyltransferase Expression During <em>Citrus paradisi</em> Growth and Development.
… metabolites that have significant roles in plant defense and human nutrition. Glucosyltransferases (GTs) transfer sugars from high energy sugar donors to other substrates. Several different kinds of flavonoid GTs exist in the tissues of grapefruit making it a model plant for studying their …
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Micromachined Electrochemical Sensors For Hydrogen Peroxide And Chlorine Detection
… important roles in a variety of fields including plant physiology, medical, environmental and biochemical applications. Its role in plant defense and signal transduction, diseases such as Parkinson's and Alzhemier's, industrial processes such as disinfection and wastewater treatment and …
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Role of the COP9 Signalosome In Defense Responses In tomato
… the involvement of the CSN in the regulation of defense responses is largely unknown. It was shown that silencing of the CSN subunit <em>CSN5</em> resulted in reduced wound-and herbivory-induced levels of jasmonic acid and reduced expression of wound-response genes. Unexpectedly, these plants …
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Functional analysis of soybean dirigent genes
… the soybean dirigent genes and their effect on plant defense to pathogens was studied. Dirigent proteins, present in all of the major land plants, have been hypothesized to work in concert with oxidative enzymes to direct the synthesis of stereospecific lignans, such as (+) or (-)-pinoresinol, …
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Investigating behaviors of zoonotic and human pathogens on plants
… within the phyllosphere and rhizosphere of these plants is an extremely complex issue. In addition, the CDC estimates that unspecified agents are responsible for 38.4 million out of the 48 million (80 %) cases of foodborne illnesses. It is hypothesized that environmental E. coli not typically …
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