ABSTRACT
Nitrate or ammonium fertilization significantly increased glutamine synthetase (GS) activity in nonnodulated roots of French bean (Phaseolus vulgaris), soybean (Glycine max), and pea (Pisum sativum). Western analysis revealed substantial GS antibody-positive protein in root extracts that had minimal GS activity, indicating that an inactive form of GS may be present in nonfertilized plants.
ABSTRACT
The growth of rhizobia under 1% O(2) induced the accumulation of alpha,alpha-trehalose, and the effect of low O(2) was independent of medium composition and Rhizobium species. Trehalose concentration in cells declined rapidly when microaerobic cultures were supplied with 21% O(2). Trehalose formation in nodules may be induced by the microaerobic environment.
