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Effects of water stress on enzymes of ammonia assimilation in root nodules of alfalfa (Medicago sativa)

AuthorsBecana Ausejo, Manuel ; Aparicio-Tejo, Pedro María ; Sánchez-Díaz, Manuel
KeywordsGlutamate synthase
Glutamine synthetase
NAD+-glutamate dehydrogenase
NADH-glutamate dehydrogenase
Issue DateAug-1984
PublisherJohn Wiley & Sons
CitationPhysiologia Plantarum 61 (4): 653–657 (1984)
AbstractProtein content and activities of the enzymes glutamine synthetase (EC, NADH-glutamate synthase (EC, NADH-glutamate dehydrogenase (reductive amination (EC and NAD+-glutamate dehydrogenase (oxidative deamination) (EC from the plant fraction of root nodules of alfalfa (Medicago sativa L. cv. Aragon) were determined under water stress. Only NADH-glutamate synthase activity was inhibited during drought. The results indicate that the glutamine synthetase/NADH-glutamate synthase cycle was fully operational in alfalfa nodules of control or even mildly stressed plants when N2-fixation was not inhibited, but that the coupling between glutamine synthetase and NADH-glutamate synthase was lost as drought progressed. Patterns of glutamine synthetase and NADH-/NAD+-gluta-mate dehydrogenase activities reflect changes in ammonia content of nodules and/or availability of carbon substrates, and indicate that nodules maintain sufficient enzyme activity for ammonia assimilation throughout water stress.
Description5 Pags.
Publisher version (URL)http://dx.doi.org/10.1111/j.1399-3054.1984.tb05186.x
Appears in Collections:(EEAD) Artículos
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