Journal Article

Control of abscisic acid synthesis

Ian B. Taylor, Alan Burbidge and Andrew J. Thompson

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 51, issue 350, pages 1563-1574
Published in print September 2000 | ISSN: 0022-0957
Published online September 2000 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jexbot/51.350.1563
Control of abscisic acid synthesis

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The abscisic acid (ABA) biosynthetic pathway involves the formation of a 9‐cis‐epoxycarotenoid precursor. Oxidative cleavage then results in the formation of xanthoxin, which is subsequently converted to ABA. A number of steps in the pathway may control ABA synthesis, but particular attention has been given to the enzyme involved in the oxidative cleavage reaction, i.e. 9‐cis‐epoxycarotenoid dioxygenase (NCED). Cloning of a gene encoding this enzyme in maize was first reported in 1997. Mapping and DNA sequencing studies indicated that a wilty tomato mutant was due to a deletion in the gene encoding an enzyme with a very similar amino acid sequence to this maize NCED. The potential use of this gene in altering ABA content will be discussed together with other genes encoding ABA biosynthetic enzymes.

Keywords: Abscisic acid biosynthesis; mutants; cloning; plant stress; over‐expression.; ABA, abscisic acid; ABAld, abscisic aldehyde; ABAO, abscisic aldehyde oxidase; AO, aldehyde oxidase; AX, antheraxanthin; CaMV, cauliflower mosaic virus; DAP, days after pollination; EST, expressed sequence tag; IPP, isopentenyl pyrophosphate; LHC, light harvesting complex; LSD, lignostilbene‐α,β‐dioxygenase; MoCo, molybdenum cofactor; MPT, molybdopterin; Mu, mutator transposon; NCE, 9‐cis‐epoxycarotenoid; NCED, 9‐cis‐epoxycarotenoid dioxygenase; NR, nitrate reductase; NX, neoxanthin; ORF, open reading frame; PCR, polymerase chain reaction; TAO, tomato aldehyde oxidase; VX, violaxanthin; XAN, xanthoxin or xanthoxal; XDH, xanthine dehydrogenase; ZEP, zeaxanthin epoxidase; ZX, zeaxanthin.

Journal Article.  8739 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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