Abstract
Ontogenetic changes in glutamine synthetase were studied in relation to dinitrogen fixation in chickpea ( Cicer arietinum L.) nodules. Two GS isoforms (designated as GS n1 and GS n2 ) were observed during active stages of nitrogen fixation whereas mainly one GS isoform (GS n2 ) was observed in the degenerating nodules. There was a substantial increase in the activity of GS n1 during active nitrogen fixation, suggesting that GS n1 plays an important role in ammonia assimilation in chickpea nodules. In contrast to other legume nodules, electrophoretic mobility of GS n1 in chickpea nodules was faster than that of GS n2 . These observations suggest that GS n1 appears to be quite different than the GS n1 reported in the other legume nodules.
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