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Article

Acidic conditions permit effective nodulation of alfalfa by invasion-deficient Rhizobium meliloti exoD mutants.

Genes & development - 1 Dec 1991

Reed J W, Walker G C

Abstract excerpt

Rhizobium meliloti exoD mutants are deficient in invasion of alfalfa nodules and, as a consequence, the nodules that exoD strains induce fail to fix nitrogen. These nodules appear to be arrested at the same stage as nodules induced by other exo mutants, which do not make an acidic exopolysaccharide called EPS I, or by ndv mutants, which do not produce a periplasmic cyclic beta(1,2) glucan. However previous...

Topics

Amino Acid Sequence
Bacterial Proteins
Base Sequence
Cloning, Molecular
DNA, Bacterial
Genes, Bacterial
Hydrogen-Ion Concentration
Medicago sativa
Membrane Proteins
Molecular Sequence Data
Mutation

Methodology Data sources Editorial policy Privacy About Contact Helena Bioinformatics

Nitrogen Fixation

Sinorhizobium meliloti

Source

Identifiers

PMID: 1748284
DOI: 10.1101/gad.5.12a.2274

Provenance

PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 29 Aug 2026. Prepared record publication-1748284-2026-08-29.1. Manifest publication-graph-cohort-2026-08-29.1.

Source receipt: PubMed via Helena Literature Corpus, retrieved 29 Aug 2026.

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Acidic conditions permit effective nodulation of alfalfa by invasion-deficient Rhizobium meliloti exoD mutants.PMID 1748284Read ↗

The exoD gene of Rhizobium meliloti encodes a novel function needed for alfalfa nodule invasion.Semantic proximity Read ↗

Regulation of Rhizobium meliloti exo genes in free-living cells and in planta examined by using TnphoA fusions.Semantic proximity Read ↗

Novel Genes and Regulators That Influence Production of Cell Surface Exopolysaccharides in Sinorhizobium meliloti.Semantic proximity Read ↗

The regulation of exopolysaccharide production is important at two levels of nodule development in Rhizobium meliloti.Semantic proximity Read ↗

Genetic analyses of Rhizobium meliloti exopolysaccharides.Semantic proximity Read ↗

ndvF, a novel locus located on megaplasmid pRmeSU47b (pEXO) of Rhizobium meliloti, is required for normal nodule development.Semantic proximity Read ↗

Exogenous suppression of the symbiotic deficiencies of Rhizobium meliloti exo mutants.Semantic proximity Read ↗

Second site mutations specifically suppress the Fix- phenotype of Rhizobium meliloti ndvF mutations on alfalfa: identification of a conditional ndvF-dependent mucoid colony phenotype.Semantic proximity Read ↗

The symbiotic defect of Rhizobium meliloti exopolysaccharide mutants is suppressed by lpsZ+, a gene involved in lipopolysaccharide biosynthesis.Semantic proximity Read ↗

Analysis of the Rhizobium meliloti genes exoU, exoV, exoW, exoT, and exoI involved in exopolysaccharide biosynthesis and nodule invasion: exoU and exoW probably encode glucosyltransferases.Semantic proximity Read ↗

Multiple genetic controls on Rhizobium meliloti syrA, a regulator of exopolysaccharide abundance.Semantic proximity Read ↗

Exopolysaccharide production in response to medium acidification is correlated with an increase in competition for nodule occupancy.Semantic proximity Read ↗

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