Open AccessRhizobium meliloti chromosomal loci required for suppression of exopolysaccharide mutations by lipopolysaccharide
Author(s) -
Michèle Williams,
Rawle I. Hollingsworth,
Pius Brzoska,
Ethan R. Signer
Publication year - 1990
Publication title -
journal of bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.652
H-Index - 246
eISSN - 1067-8832
pISSN - 0021-9193
DOI - 10.1128/jb.172.11.6596-6598.1990
Subject(s) - biology , mutant , rhizobium , lipopolysaccharide , bacteria , genetics , phenotype , sinorhizobium meliloti , gene , rhizobiaceae , microbiology and biotechnology , mutation , extracellular , strain (injury) , root nodule , nitrogen fixation , symbiosis , anatomy , endocrinology
Mutants of alfalfa symbiont Rhizobium meliloti SU47 that fail to make extracellular polysaccharide (exo mutants) induce the formation of nodules that are devoid of bacteria and consequently do not fix nitrogen. This Fix- phenotype can be suppressed by an R. meliloti Rm41 gene that affects lipopolysaccharide structure. Here we describe mutations preventing suppression that map at two new chromosomal loci, lpsY and lpsX, present in both strains. Two other lps mutations isolated previously from SU47 also prevented suppression.