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The pattern of assimilation of NH(4) (+) by Alnus glutinosa, a N(2)-fixing, nonleguminous angiosperm, was examined. Detached nodules, roots, and nodulated roots of intact plants were exposed to (13)NH(4) (+) for up to 15 minutes. Glutamine was the most highly labeled compound at all times; the only other compound labeled significantly was glutamate. Similar results were obtained after incubating soybean (L. merr) nodules and roots with (13)NH(4) (+). These observations and the results of pulse-labeling and inhibitor studies with nodules of Alnus were distinctly different from those predicted for the assimilation of NH(4) (+) via glutamine synthetase and glutamate synthase and suggest that glutamate dehydrogenase may play a major role in the assimilation of exogenously supplied NH(4) (+).

Ammonia Assimilation in Alnus glutinosa and Glycine max