Archives of Microbiology

, Volume 156, Issue 6, pp 501–506 | Cite as

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

  • Michaël W. Breedveld
  • Ludovicus P. T. M. Zevenhuizen
  • Alexander J. B. Zehnder
Original Papers


Rhizobium leguminosarum biovar trifolii TA-1 produced high molecular weight extracellular (EPS) and capsular polysaccharides (CPS) as the main carbohydrate products in a medium (10 g of mannitol and 1 g of glutamic acid per liter) with low osmotic pressure of 0.20 MPa. By increasing the osmotic pressure of the medium with the addition of NaCl or other osmolytes up to 1.44 MPa, the synthesis of EPS and CPS was suppressed. Cyclic β-(1,2)-glucans were excreted instead. Concentrations of over 1500 mg of glucans/l medium were produced by a biomass of 520 mg protein at 200 mM NaCl (1.20 MPa). Intracellular cyclic β-(1,2)-glucan concentrations remained at 45 to 100 mg/g protein during the stationary phase, independent of the osmotic strength of the medium. Parallel to the increasing osmotic pressure of the medium, the disaccharide trehalose accumulated in the cells as osmo-protectant. Concentrations of up to 130 mg/g protein were reached. Strain TA-1 could tolerate 350 mM NaCl.

Key words

Osmotic pressure Osmoregulants Cyclic β-(1,2)-glucans Extracellular polysaccharides Capsular polysaccharides Trehalose Rhizobium leguminosarum biovar trifolii 



capsular polysaccharide


extracellular polysaccharide


low molecular weight


high molecular weight


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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Michaël W. Breedveld
    • 1
  • Ludovicus P. T. M. Zevenhuizen
    • 1
  • Alexander J. B. Zehnder
    • 1
  1. 1.Department of MicrobiologyAgricultural UniversityWageningenThe Netherlands

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