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Analysis of Rhizobium meliloti nodulation mutant WL131: novel insertion sequence ISRm3 in nodG and altered nodH protein product.

Nodulation (nod) genes are required for invasion of legumes by Rhizobium bacteria. Mutant WL131 is a derivative of 102F51 that has a severe Nod- phenotype on alfalfa. Upon examination of the extended DNA region containing host-specific nodulation genes nodFEG and nodH, we found that the nodG gene of WL131 bears a novel insertion sequence, ISRm3. Complementation studies implied, however, that the phenotype on alfalfa correlated with the nodH locus. We found that nodH in WL131 encodes an altered gene product. Correlation of the WL131 defect with nodH was also supported by phenotypic behavior. Each mutation affected nodulation more severely on alfalfa (Medicago sativa) than on sweet clover (Melilotus albus). However, we found that the degree of requirement for nodH in nodulation varied with the conditions under which the plant was grown.[1]

References

  1. Analysis of Rhizobium meliloti nodulation mutant WL131: novel insertion sequence ISRm3 in nodG and altered nodH protein product. Ogawa, J., Brierley, H.L., Long, S.R. J. Bacteriol. (1991) [Pubmed]
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