Journal of Experimental Botany, Vol. 51, No. 350, pp. 1563-1574,
September 2000
© 2000 Oxford University Press
Control of abscisic acid synthesis
1 Plant Science Division, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK
2 Plant Genetics and Biotechnology Department, Horticulture Research International, Wellesbourne, Warwickshire CV35 9EF, UK
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.
Key words: Abscisic acid biosynthesis, mutants, cloning, plant stress, over-expression.
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