Abstract
Abstract Two wilty tomato mutants, flacca and sitiens, fail to increase their endogenous ABA concentration in response to water stress. Instead, a compound accumulates which has been identified as 2‐trans‐ABA alcohol. Levels of this compound have been estimated for three wilty mutants and the control; both before and after water stress. When the compound was biosynthesized in the presence of 18O2, one atom appeared to be incorporated into the primary alcohol group. The possible implications of this for the ABA biosynthetic pathway are discussed.
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