Osmotically-regulated trehalose accumulation and cyclic β-(1,2)-glucan excretion by Rhizobium leguminosarum biovar trifolii TA-1

The Rhizobiaceae

“…Alterations of osmotic pressure induce modifications of EPS production in S. meliloti (Breedveld et al, 1990b;Zevenhuizen and Faleschini 1991). A difference in the relative production of high molecular weight and low molecular weight EPS I depending on the environmental osmolarity was reported for S. meliloti SU47 but not for A. tumefaciens (Breedveld et al, 1990b).…”

“…nitrogen, phosphate and sulfur, was found to stimulate EPS I production of S. meliloti SU47 Doherty et al, 1988), whereas phosphate limitation stimulated EPS II production (Zhan et al, 1991). Low osmotic pressure resulted in the predominant production of low molecular weight EPS I (Breedveld et al, 1990b). Low osmotic pressure resulted in the predominant production of low molecular weight EPS I (Breedveld et al, 1990b).…”

“…However, this conclusion is complicated by observations that the level of cellassociated cyclic j3-glucans in several strains of R. leguminosarum is independent of growth medium osmolarity (Breedveld et al, 1991). However, this conclusion is complicated by observations that the level of cellassociated cyclic j3-glucans in several strains of R. leguminosarum is independent of growth medium osmolarity (Breedveld et al, 1991).…”

“…However, this conclusion is complicated by observations that the level of cellassociated cyclic j3-glucans in several strains of R. leguminosarum is independent of growth medium osmolarity (Breedveld et al, 1991). It is important to note that these R. leguminosarum strains synthesize only neutral, unsubstituted cyclic j3-(1,2)-glucans (Breedveld et al, 1991;Zevenhuizen et al, 1990). It is important to note that these R. leguminosarum strains synthesize only neutral, unsubstituted cyclic j3-(1,2)-glucans (Breedveld et al, 1991;Zevenhuizen et al, 1990).…”

Plant Microbes Symbiosis: Applied Facets

“…The growth of many rhizobial species is inhibited by 100 mM NaCl ); however, Mohammad et al ( 1991 ) have reported that a few can tolerate NaCl concentration of 300-700 mM. Breedveld et al ( 1991 ) reported that R. leguminosarum can tolerate up to 350 mM NaCl. The fast-growing strains of soybean and chickpea rhizobia can also tolerate up to 340 mM NaCl compared to slow-growing strains (Elsheikh and Wood 1995 ).…”