Abstract
Summary Seeds of flacca , the wilty tomato mutant deficient in abscisic acid (ABA), had a shorter mean germination time than those of the control cultivar, Rheinlands Ruhm. Applied ABA delayed germination of both control and mutant seeds, the latter appearing to be more sensitive to the hormone. Transfer from ABA to water allowed germination levels to reach those of controls within two or three days. It is speculated that low endogenous ABA levels in flacca seeds might result in the observed precocious germination. Viviparous germination was observed within ripe flacca fruit which may also have resulted from the hormone deficiency. Flacca seedlings exhibited normal gravitropic behaviour. This finding is discussed in regard to current theories of hormonal control of gravitropism.
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