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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1985 Apr;162(1):335–343. doi: 10.1128/jb.162.1.335-343.1985

Isolation and characterization of transposon Tn5-induced symbiotic mutants of Rhizobium loti.

K Y Chua, C E Pankhurst, P E Macdonald, D H Hopcroft, B D Jarvis, D B Scott
PMCID: PMC218994  PMID: 2984178

Abstract

Rhizobium loti NZP2037 and NZP2213, each cured of its single large indigenous plasmid, formed effective nodules on Lotus spp., suggesting that the symbiotic genes are carried on the chromosome of these strains. By using pSUP1011 as a vector for introducing transposon Tn5 into R. loti NZP2037, symbiotic mutants blocked in hair curling (Hac), nodule initiation (Noi), bacterial release (Bar), and nitrogen fixation (Nif/Cof) on Lotus pedunculatus were isolated. Cosmids complementing the Hac, Noi, and Bar mutants were isolated from a pLAFR1 gene library of NZP2037 DNA by in planta complementation and found to contain EcoRI fragments of identical sizes to those into which Tn5 had inserted in the mutants. The cosmids that complemented the mutants of these phenotypic classes did not share common fragments, nor did cosmids that complemented four mutants within the Noi class, suggesting that these symbiotically important regions are not tightly linked on the R. loti chromosome.

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Selected References

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