Promotion by Gibberellic Acid of Polyamine Biosynthesis in Internodes of Light-Grown Dwarf Peas 1
AUTOR(ES)
Dai, Yao-Ren
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=426154Documentos Relacionados
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