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Experimental study reveals intact nitrogen fixation in peas inoculated with proline-mutant Rhizobium leguminosarum, indicating proline is not an essential host-supplied energy source.
The potential role of proline in bacteroid metabolism of Rhizobium leguminosarum biovar viciae strain C1204b was investigated. Proline auxotrophic, catabolic, and overproducing mutants were generated and used as inoculants of pea (Pisum sativum L. cv Alaska). Cytosolic and bacteroid levels of glutamate and proline determined for the nodular tissue did not support the role of proline as a key metabolite supplied by the host. Furthermore, a R. leguminosarum proline catabolic mutant had a negligible impact on nitrogenase activity as evaluated by acetylene reduction.
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Chien et al. (1991) studied this question.
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