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Volume 153, Issue 12

A mutant with reduced glucan content shows defective invasion of its host plant Free

Abstract

Random transposon mutagenesis led to the isolation of a novel mutant that is defective in nitrogen fixation during symbiosis with . The mutated locus, designated , encodes a putative cell-envelope protein displaying no significant sequence similarity to proteins with known functions. This mutant elicits the formation of nodule-like bumps and root-hair curling, but not the elongation of infection threads, on roots. This is reminiscent of the phenotypes of rhizobial mutants impaired in cyclic -glucan biosynthesis. The mutant exhibits partially reduced content of cell-associated glucans and intermediate deficiency of motility under hypo-osmotic conditions as compared to a glucan-deficient mutant. Second-site pseudorevertants of the mutant were isolated by selecting for restoration of symbiotic nitrogen fixation. A subset of pseudorevertants restored both symbiotic capability and glucan content to levels comparable to that of the wild-type. These results suggest that the Cep product acts on a successful symbiosis by affecting cell-associated glucan content.

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  • Accepted:
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  • Published Online:
Keyword(s): Gm, gentamicin , IT, infection thread , MDO, membrane-derived oligosaccharide , Nm, neomycin , Sm, streptomycin , Sp, spectinomycin and XP, 5-bromo-4-chloro-3-indolyl phosphate
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2007-12-01
2024-04-19
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A Mesorhizobium loti mutant with reduced glucan content shows defective invasion of its host plant Lotus japonicus
Microbiology 153, 3983 (2007); https://doi.org/10.1099/mic.0.2007/008631-0
/content/journal/micro/10.1099/mic.0.2007/008631-0
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