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Articles

Metabolism of ³H-Gibberellin A₁ and ³H-Gibberellin A₄ by Phaseolus coccineus Seedlings

Richard C. Durley^b, David M. Reid^b,2 and Richard P. Pharis^b,3

^a Department of Botany, The University, Glasgow G12 8QQ, Scotland, ^b Department of Biology, University of Calgary, Calgary, Alberta T2N 1N4, Canada

[³H]-Gibberellin A₁ (GA₁) and ³H-GA₄ were applied separately to Phaseolus coccineus seedlings grown under red light. ³H-GA₁ was converted to a compound with gas-liquid radiochromatography retention times identical to those of GA₈. ³H-GA₄ underwent conversion to at least three metabolites, none of which corresponded to GA_1-38. The rate of metabolism of ³H-GA₄ was significantly higher than that of ³H-GA₁.

² Supported by National Research Council (Canada) Grant A-5727.

³ Supported by National Research Council (Canada) Grant A-2585.