Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 51, Issue 350, Pages 1563-1574Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jexbot/51.350.1563
Keywords
abscisic acid biosynthesis; mutants; cloning; plant stress; over-expression
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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.
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