Abscisic Acid and C10Dicarboxylic Acids in Wilty Tomato Mutants

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Abstract
Linforth, R. S. T., Taylor, I. B. and Hedden, P. 1987. Abscisic acid and C10 dicarboxylic acids in wilty tomato mutants.—J. exp. Bot. 38: 1734–1740. The concentration of C10 dicarboxylic acids in wilty tomato mutants was investigated. Three of the genotypes studied (flacca, sitiens and the double mutant homozygote flacca/sitiens) were found to have higher concentrations of 2,7-dimethyl-2,4-octadienedioic acid (ODA) than the isogenic normal form. In contrast, the other genotypes (notabilisand the double mutant homozygotes notabilis/flacca and notabilis/sitiens) were found to have lower concentrations of ODA than the isogenic normal form. The concentration of ODA in flacca plants was increased by water stress and reduced by exogenously applied abscisic acid (ABA). A second structurally related compound, 2,7-dimethyl-4-octenedioic acid (OEA) was also quantified, but it showed no clear genotype-related pattern. The concentration of ABA in the wilty tomato mutants was also investigated. As expected in the light of previously published results, it was reduced in the single mutants relative to the isogenic control plants. In the double mutant flacca/sitiens ABA levels were similar to those of the single mutant sitiens. However, in the two double mutants notabilis/flacca and notabilis/sitiens ABA was substantially lower than those in any other genotype investigated.