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 18 of 18 for “"brassinosteroid"”.
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Molecular Characterisation of the Brassinosteroid, Phytosulfokine and cGMP-dependent Responses in Arabidopsis thaliana
… exogenous application of both Phytosulfokine and Brassinosteroid increase changes of intracellular cGMP levels in Arabidopsis mesophyll protoplast demonstrating that these molecules have GC activity in vivo and therefore provide a link as second messenger between the hormones and down-stream …
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Can plant survive without steroids: Modulation of plant architecture and sex determination through brassinosteroid biosynthesis and signaling
… maize. Among the major plant growth regulators, brassinosteroids (BRs) affect multiple developmental processes and plant architecture traits, including organ size, sex determination, and leaf angle. However, genetic mechanisms by which BRs regulate plant architecture traits in maize remain poorly …
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Crosstalk of protein phosphorylation and lysine acetylation on 14-3-3 proteins and their applications in brassinosteroid signaling and photosynthesis
… the phosphorylation of 14-3-3ω by the brassinosteroid receptor kinase BRI1 and its co-receptor BAK1. We identified eight novel Ser/Thr residues that were phosphorylated by BRI1 and/or BAK1 in vitro. Four of these phosphorylation sites (Thr-41, Thr-83, Thr94 and Thr-140) were confirmed …
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Computational investigation of early events in plant growth signaling
Brassinosteroids are a class of plant hormones critical for control of growth and development. While the signaling pathway through which brassinosteroid signals are processed has been the subject of intense study for the past 50 years, relatively little is known about the precise nanoscopic events …
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Exploiting crosstalk between growth and immunity in plants : the role of the <i>Phytophthora infestans</i> effector AVR2 in potato late blight
… phosphatases in potato, the BSLs, implicated in brassinosteroid pathway signalling – a major hormone signalling pathway in plants associated with growth and development. This work investigates the role of AVR2 and its host targets in pathogen virulence, with focus on the link between the …
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ANALYSIS OF VARIATIONS IN SUSCEPTIBILITY AND TRANSCRIPTOME RESPONSES IN TOMATO TO TWO-SPOTTED SPIDER MITE FEEDING
… and presented in this thesis. MicroTom (a brassinosteroid biosynthesis mutant) was found to be resistant to mite feeding, while MicroTom-D (a near isogenic line with increased brassinosteroid biosynthesis) was susceptible indicating that brassinosteroids may have a role in defences against …
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Molecular cloning and characterization of two Arabidopsis thaliana sulfotransferases
… specificity for various stereoisomers of brassinosteroids and their immediate precursors. AtST6 was found to sulfonate a wide range of primary and secondary alcohols with unknown kinetics. Molecular characterization of AtST4a and AtST6 revealed that the deduced protein sequence of both …
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Computational investigation of molecular recognition in plant hormone signal transduction
… been identified, including abscisic acid, auxin, brassinosteroid, cytokinin, ethylene, giberellin, jasmonic acid, salicylic acid and strigolactone. Plant hormones are specifically recognized by their receptor proteins, and then initiate downstream protein-protein interactions to trigger a variety …
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Mapping signaling networks and rapidly evolving genes in the developing Arabidopsis seed at single-nucleus resolution
… are rapidly evolving, and that genes underlying brassinosteroid biosynthesis and response are expressed in adjacent tissues, among other findings. This thesis illuminates potentially new mechanisms for inter-tissue coordination and provides a transcriptional reference for future seed studies.
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Avoiding trade-off when enhancing Fusarium head blight resistance of barley
… using barley BRI1 mutation lines, which display brassinosteroid (BR) insensitivity and a semi-dwarf phenotype. Interestingly, bri1 semi-dwarf lines did not display increased susceptibility to FHB. Additionally, bri1 mutation provided advantageous resistance to necrotrophs but did not increase …
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Brachypodium distachyon as a genetic model pathosystem to study resistance against fungal pathogens of small grain cereals
… of Fusarium resistance. Mutation of the main brassinosteroid (BR) receptor (BRI1) was characterized and validated. Other mutants defective in auxin or ET responsiveness and jasmonic acid (JA) biosynthesis were investigated. Results suggest that JA and BRI1 promote disease susceptibility. …
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Investigation of the recognition and host target of the Phytophthora infestans effector PiAVR2
… phosphatases which function as activators of the brassinosteroid signal transduction pathway. It was shown that silencing of the BSL1 and BSL2a genes within plants results in the attenuation of PiAVR2 recognition by R2. In the case of BSL1 it was further shown that an interaction between R2 and …
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Molecular and biochemical characterization of steroid sulfotransferases from Brassica napus and Arabidopsis thaliana
… . Recombinant BNST3 catalyzes the sulfonation of brassinosteroids and of mammalian estrogenic steroids. The enzyme is stereospecific for 24-epibrassinosteroids, with a substrate preference for 24-epicathasterone, a metabolic precursor of 24-epibrassinolide. The bean second internode bioassay was …
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Circadian regulation and phytohormone responses of cytochrome P450 monooxygenase genes in Arabidopsis
… carotenoid, oxylipin, glucosinolate and brassinosteroid biosynthese pathways are circadian-regulated. The next phase of my research investigated the circadian rhythms of P450 genes under different phytohormone treatments including methyl jasmonate (MeJ), salicylic acid (SA), abscisic acid …
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Physiological and Molecular Dissection of Salinity Tolerance in Arabidopsis and Maize and Nitrogen Uptake in Wheat
… that the prt6 mutation enhances ethylene and brassinosteroid responses, resulting in restricted Na+ accumulation in roots and shoots as well as increased expression of dehydrin genes such as RD29A and RD29B. Maize prt6 mutant plants, contrary to our observation in Arabidopsis, showed lower …
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The Role of the Ubiquitin-Proteasome Pathway During Xylem Differentiation in <I>Zinnia elegans</I> Mesophyll Cells and <I>Arabidopsis thaliana</I>
… Auxin (naphthaleneacetic acid, NAA) and a brassinosteroid (2,4-epibrassinolide, BI) stimulate only cell elongation. Cytokinin (N-6-benzyladenine, BA) has a greater effect on growth in cell girth rather than length. Gibberellic acid (GA₃) has equivalent effects on expansion in both …
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Female sterility and carpel development in plants
… 5 (RRP5), PRESEQUENCE PROTEASE 1 (PREP1) AND BRASSINOSTEROID-SIGNALING KINASE 2 (BSK2), all of which are known to play roles in female reproductive development.
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Characterization of theWound-Induced Signaling Pathway In Tomato
<p>Plants must defend themselves from a wide array of biotic stresses, including herbivorous insects, phytopathogenic fungi, bacteria, and viruses. The varied nature of these stressors requires that the plant recognize a specific stress and mount an appropriate defense response. The defense …