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ABSCISIC ACID BIOSYNTHESIS AND CATABOLISM

ABSCISIC ACID BIOSYNTHESIS AND CATABOLISM The level of abscisic acid ( ABA abscisic acid ) in any particular tissue in a plant is determined by the rate of biosynthesis and catabolism of the hormone. Therefore, identifying all the genes involved in the metabolism is essential for a complete understanding of how this hormone directs plant growth and development. To date, almost all the biosynthetic genes have been identified through the isolation of auxotrophic mutants. On the other hand, among several ABA catabolic pathways, current genomic approaches revealed that Arabidopsis CYP707A genes encode ABA 8′-hydroxylases, which catalyze the first committed step in the predominant ABA catabolic pathway. Identification of ABA metabolic genes has revealed that multiple metabolic steps are differentially regulated to fine-tune the ABA level at both transcriptional and post-transcriptional levels. Furthermore, recent ongoing studies have given new insights into the regulation and site of ABA metabolism in relation to its physiological roles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

ABSCISIC ACID BIOSYNTHESIS AND CATABOLISM

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Publisher
Annual Reviews
Copyright
Copyright © 2005 by Annual Reviews. All rights reserved
ISSN
1543-5008
eISSN
1545-2123
DOI
10.1146/annurev.arplant.56.032604.144046
pmid
15862093
Publisher site
See Article on Publisher Site

Abstract

The level of abscisic acid ( ABA abscisic acid ) in any particular tissue in a plant is determined by the rate of biosynthesis and catabolism of the hormone. Therefore, identifying all the genes involved in the metabolism is essential for a complete understanding of how this hormone directs plant growth and development. To date, almost all the biosynthetic genes have been identified through the isolation of auxotrophic mutants. On the other hand, among several ABA catabolic pathways, current genomic approaches revealed that Arabidopsis CYP707A genes encode ABA 8′-hydroxylases, which catalyze the first committed step in the predominant ABA catabolic pathway. Identification of ABA metabolic genes has revealed that multiple metabolic steps are differentially regulated to fine-tune the ABA level at both transcriptional and post-transcriptional levels. Furthermore, recent ongoing studies have given new insights into the regulation and site of ABA metabolism in relation to its physiological roles.

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 2, 2005

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