Abstract
Rhizobium bacteria can secrete large amounts of extracellular Polysaccharides (EPS), depending on the growth conditions. For example, nitrogen and phosphate limitation stimulate EPS production, whereas carbon deficit limits EPS production. Previous research, especially with Sinorhizobium meliloti, has shown that EPS is involved in establishment of a successful symbiosis of rhizobia with legumes forming indeterminate root nodules (Leigh, Walker 1994). Here we summarize results of our studies on genetics of EPS biosynthesis by R. leguminosarum and on the biological importance of these EPS in the root nodule symbiosis with vetch (see also Van Workum et al. 1995, 1997).
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