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Articles

Promotion by Gibberellic Acid of Polyamine Biosynthesis in Internodes of Light-Grown Dwarf Peas ¹

Department of Biology, Yale University, New Haven, Connecticut 06511

When gibberellic acid (GA₃; 5-35 micrograms per milliliter) is sprayed on 9-day-old light-grown dwarf Progress pea (Pisum sativum) seedlings, it causes a marked increase in the activity of arginine decarboxylase (ADC; EC 4.1.1.9) in the fourth internodes. The titer of putrescine and spermidine, polyamines produced indirectly as a result of ADC action, also rises markedly, paralleling the effect of GA₃ on internode growth. Ammonium (5-hydroxycarvacryl) trimethyl chloride piperidine carboxylate (AMO-1618; 100-200 micrograms per milliliter) causes changes in the reverse direction for enzyme activity, polyamine content, and growth. GA₃ also reverses the red-light-induced inhibition of ADC activity in etiolated Alaska pea epicotyls; this is additional evidence for gibberellin-light interaction in the control of polyamine biosynthesis. The enzyme ornithine decarboxylase (ODC; EC 4.1.1.17), an alternate source of putrescine arising from arginine, is not increased by GA₃ or by AMO-1618.

The results support the hypothesis that ADC and polyamine content are important regulators of plant growth.

¹ Supported by grants from the National Science Foundation and Binational Agricultural Research and Development Fund (to A. W. G.).

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