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. 1986 Mar;51(3):477–480. doi: 10.1128/aem.51.3.477-480.1986

Restriction Endonuclease and nif Homology Patterns of Bradyrhizobium japonicum USDA 110 Derivatives With and Without Nitrogen Fixation Competence †

James N Mathis 2,‡, L David Kuykendall 2, Gerald H Elkan 2,*
PMCID: PMC238904  PMID: 16347007

Abstract

DNAs from Bradyrhizobium japonicum USDA 110 derivatives that differ in nitrogen-fixing ability produced similar electrophoretic patterns with five different restriction enzymes. Our data support the hypothesis of common ancestry for these derivatives. Derivatives I-110 and L1-110 differed as much as 100-fold in acetylene reduction activity when they were tested with several soybean cultivars in both greenhouse and field experiments. While possessing nodulating ability, derivative L1-110 is deficient in symbiotic nitrogen-fixing ability, whereas derivative I-110 is symbiotically competent. Hybridization of nifDK and nifH probes from B. japonicum to Southern blots of restricted DNAs from strain USDA 110 derivatives produced similar patterns. This finding indicates similar structural gene organization for both derivative I-110 and derivative L1-110 and implies that the difference in symbiotic nitrogen fixation is probably not due to structural gene rearrangements. However, our hybridization data do not rule out the possibility of differences in expression of structural nif genes or alterations in the structure or expression of other genes required for symbiotic nitrogen fixation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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