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 Physioljournal_title
Plant physiologyauthors
Gage DA,Fong F,Zeevaart JAdoi
10.1104/pp.89.4.1039subject
Has Abstractpub_date
1989-04-01 00:00:00pages
1039-41issue
4eissn
0032-0889issn
1532-2548journal_volume
89pub_type
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