The fatty acid (FA) composition of bacteroid and peribacteroid membranes was studied in the symbiotic pairs differing in their nitrogen-fixing efficiency; the results are compared with the FA composition of plasmalemma and free-living rhizobia. The experiments involved lupine plants inoculated with strains of Bradyrhizobium lupini359a (Nod+Fix+) and 400 (Nod+Fix L) manifesting high and low nitrogen-fixing efficiency, respectively, and broad bean plants inoculated with strains of Rhizobium leguminosarum97 (Nod+Fix+) and 87 (Nod+Fix L) of high and low nitrogen-fixing efficiency, respectively. We showed that the rhizobia of the strains 359a and 97 were able to form nodules with peribacteroid membranes containing FA mainly or exclusively of plant origin. These strains were able to develop effective symbiotic pairs with legume plants. The use of strains 400 and 87 resulted in the formation of nodules with peribacteroid membranes containing typical bacterial (branched-chain) FAs; these strains were characterized by an ineffective symbiosis.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 10, 2004
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