Open AccessEffect of root exudates on the exopolysaccharide composition and the lipopolysaccharide profile of Azospirillum brasilense Cd under saline stress
Author(s) -
Fischer Sonia Elizabeth,
Miguel Marioli Juan,
Mori Gladys Beatriz
Publication year - 2003
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1016/s0378-1097(02)01194-1
Subject(s) - azospirillum brasilense , xylose , rhamnose , galactose , arabinose , fucose , chemistry , microbiology and biotechnology , exudate , saline , bacteria , food science , biochemistry , microbial inoculant , biology , botany , fermentation , genetics , endocrinology
The effect of wheat root exudates on the exopolysaccharide (EPS) composition and the lipopolysaccharide (LPS) profile of Azospirillum brasilense Cd under saline stress was studied. EPS of A. brasilense Cd was composed of glucose (47%), mannose (3%), xylose (4%), fucose (28%), rhamnose (6%), arabinose (1%) and galactose (11%). Under saline stress, A. brasilense produced a totally different EPS, composed mainly of galactose. Root exudates induced changes in A. brasilense EPS composition only under normal conditions, consisting of higher amounts of arabinose and xylose compared with EPS of bacteria grown without root exudates. No changes were induced by root exudates when A. brasilense was grown under saline stress. Additionally, root exudates induced changes in the LPS profile, both under normal and stress conditions.