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Analysis of Aldoxime-Mediated Metabolic Network in Brassicales and Monocots- [electronic resource]
Analysis of Aldoxime-Mediated Metabolic Network in Brassicales and Monocots - [electronic ...
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Analysis of Aldoxime-Mediated Metabolic Network in Brassicales and Monocots- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214095917
ISBN  
9798379754860
DDC  
580
저자명  
Perez, Veronica Crista.
서명/저자  
Analysis of Aldoxime-Mediated Metabolic Network in Brassicales and Monocots - [electronic resource]
발행사항  
[S.l.]: : University of Florida., 2022
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2022
형태사항  
1 online resource(164 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
주기사항  
Advisor: Kim, Jeongim.
학위논문주기  
Thesis (Ph.D.)--University of Florida, 2022.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Aldoximes are amino acid derivatives that have been detected throughout the plant kingdom. Aldoximes can serve as precursors of defense compounds such as glucosinolates and cyanogenic glycosides, and recent findings have identified the tryptophan-derived indole-3-acetaldoxime (IAOx) as both a precursor of the growth hormone indole-3-acetic acid (IAA) and a modulator of phenylpropanoid production in the Brassicales species Arabidopsis thaliana and Camelina sativa. Despite these discoveries, many aspects of aldoxime metabolism remain unknown, including the components and distribution of aldoxime-derived auxin biosynthesis, the regulation and biological function of aldoxime-derived auxin and role played by other aldoximes, particularly phenylalanine-derived aldoxime in modulating phenylpropanoid biosynthesis and phenylalanine-derived auxin biosynthesis. The objective of this dissertation was to analyze the growth-related aspects of the aldoxime-mediated metabolic network (auxin biosynthesis and phenylpropanoid repression) in both A. thaliana and monocots, with a specific focus on analyzing the contributions of phenylalanine- and methionine-derived aldoximes. To accomplish this goal, aldoxime feeding assays were used to identify species and mutants capable of aldoxime-derived auxin biosynthesis. Genetic studies in A. thaliana were used to generate mutants lacking or accumulating specific aldoximes to determine their impact on plant growth and phenylpropanoid accumulation, while in maize (Zea mays) and sorghum (Sorghum bicolor) aldoxime metabolism was analyzed in vivo via feeding assays. These experiments resulted in the identification of the phenylalanine-derived aldoxime phenylacetaldoxime (PAOx) as a precursor of the auxin phenylacetic acid (PAA) and the identification of maize and sorghum as species capable of aldoxime-derived auxin biosynthesis. In A. thaliana, PAOx and methionine-derived aldoximes were shown to repress phenylpropanoid biosynthesis in an additive manner and utilizing the same mechanism as IAOx. These findings identify aldoximes as hub metabolites for the regulation of plant growth and defense and lay the framework for further elucidation of this network and its distribution as well as manipulation of this network for improved crop growth under stress conditions.
일반주제명  
Plant sciences.
일반주제명  
Biology.
키워드  
Aldoxime
키워드  
Auxin
키워드  
Crosstalk
키워드  
Phenylpropanoid
키워드  
Specialized metabolism
기타저자  
University of Florida Plant Molecular and Cellular Biology
기본자료저록  
Dissertations Abstracts International. 84-12B.
기본자료저록  
Dissertation Abstract International
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