Abscisic Acid Biosynthesis in Isolated Embryos of Zea mays L.

Abstract:

:Previous labeling experiments with (18)O(2) have supported the hypothesis that stress-induced abscisic acid (ABA) is synthesized through an indirect pathway involving an oxygenated carotenoid (xanthophyll) as a precursor. To investigate ABA formation under nonstress conditions, an (18)O(2) labeling experiment was conducted with isolated embryos from in vitro grown maize (Zea mays L.) kernels. Of the ABA produced during the incubation in (18)O(2), three-fourths contained a single (18)O atom located in the carboxyl group. Approximately one-fourth of the ABA synthesized during the experiment contained two (18)O atoms. These results suggest that ABA synthesized in maize embryos under nonstress conditions also proceeds via the indirect pathway, requiring a xanthophyll precursor. It was also found that the newly synthesized ABA was preferentially released into the surrounding medium.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Gage DA,Fong F,Zeevaart JA

doi

10.1104/pp.89.4.1039

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

1039-41

issue

4

eissn

0032-0889

issn

1532-2548

journal_volume

89

pub_type

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