Diversion of Carbon to Polysaccharide Synthesis by Bradyrhizobium Japonicum and B. Elkanii Bacteroids

摘要: Rhizobia are typical of Gram-negative bacteria in their production copious amounts extracellular polysaccharide (EPS) (see Carlson 1982). For the fast-growing species Rhizobium, EPS plays a vital role infection host plant, but similar for EPSs slow-growing rhizobia is not apparent. (Actually, it may be more appropriate to say that formation indeterminate nodules determinate (Diebold, Noel 1989).) synthesized soil, we know no direct evidence on this point. In addition EPS, produce cyclic periplasmic s-glucans Bhagwat, Keister 1992). These lower molecular weight polysaccharides probably play osmoregulation. Finally, recent indicates lipopolysaccharides (LPS) rhizobial outer membrane some nodule development (Stacey et al. 1991; Lagares