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Effects of some growth regulators on poly amine biosynthetic enzymes in etiolated pea pisum sativum cultivar alaska seedlings



Effects of some growth regulators on poly amine biosynthetic enzymes in etiolated pea pisum sativum cultivar alaska seedlings



Plant & Cell Physiology 25(4): 541-546



This study was designed to examine possible links between polyamine biosynthesis and effects of growth regulatory compounds. An auxin (IAA), a cytokinin [benzyladenine; benzylaminopurine (BAP)], an ethylene source (ethephon) and abscisic acid (ABA) were individually applied to terminal buds of excised etiolated or red light (R)-exposed pea epicotyls. Effects were noted on bud fresh weight and on the 2 main enzymes of putrescine biosynthesis, arginine decarboxylase (ADC; EC 4.1.1.19) and ornithine decarboxylase (ODC; EC 4.1.1.17). As previously reported, both bud growth and ADC activity are increased by R light. In such buds, ADC is raised further by 1-10 .mu.M BAP or ABA and inhibited by 1-10 .mu.M IAA or ethylene (50 mg/l or more of ethephon). In all cases, effects of R-irradiation plus 1 mM growth regulators on ODC activity was the inverse of their effects on ADC, indicating independent control of these pathways. These results do not support the view that putrescine biosynthetic activity is correlated with growth in etiolated pea seedlings.

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Accession: 005326395

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