Symbiotic pseudorevertants of Rhizobium meliloti ndv mutants
نویسندگان
چکیده
منابع مشابه
Synthesis of glycerophosphorylated cyclic beta-(1,2)-glucans by Rhizobium meliloti ndv mutants.
The periplasmic cyclic beta-(1,2)-glucans of Rhizobium spp. are believed to provide functions during hypoosmotic adaptation and legume nodulation. In Rhizobium meliloti, cyclic beta-(1,2)-glucans are synthesized at highest levels when cells are grown at low osmolarity, and a considerable fraction (> or = 35%) of these glucans may become substituted with phosphoglycerol moieties. Thus far, two c...
متن کاملMolecular characterization of Tn5-induced symbiotic (Fix-) mutants of Rhizobium meliloti.
To investigate the expression of specific symbiotic genes during the development of nitrogen-fixing root nodules, we conducted a systematic analysis of nodule-specific proteins and RNAs produced after the inoculation of alfalfa roots with a series of Rhizobium meliloti mutants generated by site-directed transposon Tn5 mutagenesis. The mutagenized region of the Rhizobium genome covered approxima...
متن کاملThe lipo-oligosaccharidic symbiotic signals of Rhizobium meliloti.
288 time to identify the carbohydrate-bearing structures. Recent examples of glycoproteins originally detected with lectins that have now been identified are desmosomal glycoproteins [ 151 and integrins [ 161. Changes in the carbohydrate moieties of adhesion molecules can alter their function [ 17-19] and thus the lectin patterns may turn out to provide new insights into the changes in the adhe...
متن کاملRhizobium meliloti exopolysaccharides: genetic analyses and symbiotic importance.
Genetic experiments have indicated that succinoglycan (EPS I), the acidic Calcofluor-binding exopolysaccharide, of the nitrogen-fixing bacterium Rhizobium meliloti strain Rm1021 is required for nodule invasion and possibly for later events in nodule development on alfalfa and other hosts. Fourteen exo loci on the second megaplasmid have been identified that are required for, or affect, the synt...
متن کاملAnalysis of Rhizobium meliloti Sym Mutants Obtained by Heat Treatment.
Deletions in the pSym megaplasmid of Rhizobium meliloti were produced at a high frequency, and their lengths varied according to incubation temperature. Morphological differentiation into large and small colonies occurred after heat treatment. Small colonies elicited pseudonodules on alfalfa roots.
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1990
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.172.3.1409-1417.1990