The Effects of Nonionic Hyperosmolarity and of Hight Temperature on Cell-Associated Low Molecular Weight Saccharides from Two Peanut Rhizobia Strains

DARDANELLI M.S.; WOELKE M.R.; GONZÁLEZ P.S.; BUENO M.A.; GHITTONI N.E.

SYMBIOSIS

Balaban Publishiers

Lugar: Balaban; Año: 1997 vol. 23 p. 73 - 84

0334-5114

The adaptation to nonionic hyperosmolarity and to high temperature was examined in two rhizobia strains which nodulate Arachis hypogaea (peanut). When grown under hyperosmolarity, the pattern of periplasmic low molecular weight saccharides was noticiably changed. The cellular content of this saccharide species was also modified by the tested conditions of stress: it was decreased by the species was also modified by the presence of a nonpermeating osmoticum (PEG) in the growth medium, but it was augmented either under hyperosmolarity imposed by a readily permeating solute /glycerol) or by high temperature. Futhermore, in the strain ATCC 10317 grown at 37ªC, trehalose was the major component of the increased low molecular weight saccharides.