Abstract
2- cis-[2- 14C]Xanthoxic acid prepared from natural violaxanthin was supplied to a sliced ripening avocado ( Persea americana cv. Hass) fruit together with “cold traps” of the 1′,4′- cis- and 1′,4′- trans-diols of ABA. 16% of the labelled xanthoxic acid was recovered as ABA and its diols (which, it was found later can be formed in vivo by reduction of added [ 14C]ABA). The recent finding that xanthoxal is the substrate of the molybdenum containing aldehyde oxidase in avocado fruit makes 2- cis-xanthoxic acid one of the last precursors on the biosynthetic pathway to ABA. The results reported here establish that 2- cis-xanthoxic acid is readily converted into ABA in avocado fruit.
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