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Articles

Metabolism of Tritiated Gibberellin A₂₀ in Immature Seeds of Dwarf Pea, cv. Meteor ¹

^a Department of Biology, University of Calgary, Calgary, Alberta T2N 1N4 Canada

Tritium-labeled gibberellin A₂₀ ([³H]GA₂₀) was applied via the pedicel to immature pods and seeds of dwarf peas and three harvests were made at days 5, 10, and 23 (mature) after application. Of the five metabolites of [³H]GA₂₀, the three in highest yield were GA₂₉, an ,-unsaturated ketone, and a compound (B), whose structure was only tentatively assigned. The metabolic sequence GA₂₀ GA₂₉ compound B the ketone was indicated. The amount of [³H]GA₂₉ in both seeds and pods was highest at day 5 and declined to its lowest level at maturity. The amount of the [³H]ketone in the seed increased with time to its highest level at maturity. It is suggested that compound B and the ketone represent the major pathway of catabolism of GA₂₉, a 2-hydroxylated GA of low biological activity, and that the ketone is not metabolized, or only slowly metabolized, during seed maturation.

³ Present address: Department of Agricultural Chemistry, Yamagata University, Tsuruoka, Yamagata, Japan.

⁴ To whom requests for reprints should be addressed.

¹ This work was supported by National Research Council of Canada Grant A-2585 to R. P. P.