Analysis of the role of the two flagella of Bradyrhizobium japonicum in competition for nodulation of soybean.

Abstract:

:Bradyrhizobium japonicum has two types of flagella. One has thin filaments consisting of the 33-kDa flagellins FliCI and FliCII (FliCI-II) and the other has thick filaments consisting of the 65-kDa flagellins FliC1, FliC2, FliC3, and FliC4 (FliC1-4). To investigate the roles of each flagellum in competition for nodulation, we obtained mutants deleted in fliCI-II and/or fliC1-4 in the genomic backgrounds of two derivatives from the reference strain USDA 110: the streptomycin-resistant derivative LP 3004 and its more motile derivative LP 3008. All mutations diminished swimming motility. When each mutant was co-inoculated with the parental strain on soybean plants cultivated in vermiculite either at field capacity or flooded, their competitiveness differed according to the flagellin altered. ΔfliCI-II mutants were more competitive, occupying 64-80% of the nodules, while ΔfliC1-4 mutants occupied 45-49% of the nodules. Occupation by the nonmotile double mutant decreased from 55% to 11% as the water content of the vermiculite increased from 85% to 95% field capacity to flooding. These results indicate that the influence of motility on competitiveness depended on the water status of the rooting substrate.

journal_name

FEMS Microbiol Lett

authors

Althabegoiti MJ,Covelli JM,Pérez-Giménez J,Quelas JI,Mongiardini EJ,López MF,López-García SL,Lodeiro AR

doi

10.1111/j.1574-6968.2011.02280.x

subject

Has Abstract

pub_date

2011-06-01 00:00:00

pages

133-9

issue

2

eissn

0378-1097

issn

1574-6968

journal_volume

319

pub_type

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