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Radioactive Gibberellin $\text{A}_{5}$ and Its Metabolism in Dwarf Peas

Alan Musgrave and Hans Kende
Plant Physiology
Vol. 45, No. 1 (Jan., 1970), pp. 56-61
Stable URL: http://www.jstor.org/stable/4261925
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Radioactive Gibberellin $\text{A}_{5}$ and Its Metabolism in Dwarf Peas
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Abstract

Radioactive gibberellin $\text{A}_{5}$ (${}^{3}\text{H-GA}{}_{5}$) was synthesized from gibberellic acid. When it was applied to dwarf peas grown in the dark, an average of 3% was converted to another acid gibberellin within 48 hours. The biological activity of the metabolite did not account for the response to applied $\text{GA}_{5}$. $\text{GA}_{5}$ is therefore assumed to be biologically active per se. ${}^{3}\text{H-GA}{}_{5}$ did not appear to form a stable complex with a macromolecule in pea shoots. When injected into dwarf pea pods, ${}^{3}\text{H-GA}{}_{5}$ was readily metabolized by maturing seed to more water-soluble substances and to two other acidic compounds. This metabolism continued even throughout germination of the seed without reconversion of the metabolites to $\text{GA}_{5}$. It is concluded that "bound" $\text{GA}_{5}$ plays no part in the germination of dwarf pea seeds.

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