Abstract
Polyamines (PAs) and their major metabolic enzymes were studied under different modes of salinity stress in Brassica. Long stress caused only small changes in PA level, arginine (EC 4.1.1.19) and ornithine decarboxylases (EC 4.1.1.17) and polyamine oxidase (EC 1.5.3.3.) activity. However, short stress increased PA level and enzyme activities. Diamine oxidase (EC 1.4.3.6) activity, unlike other PA metabolic enzymes, increased significantly during long stress.
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