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Role of hsfA gene on host-specificity by Bradyrhizobium japonicum in a broad range of tropical legumes

Authors
Oh, HSChun, JYLee, MSMin, KHLee, SHCheon, CI
Issue Date
Jan-2000
Publisher
NATL RESEARCH COUNCIL CANADA
Keywords
host-specific nitrogen fixation; legume-Rhizobium symbiosis; hsfA gene; host-specificity
Citation
CANADIAN JOURNAL OF MICROBIOLOGY, v.46, no.1, pp.81 - 84
Journal Title
CANADIAN JOURNAL OF MICROBIOLOGY
Volume
46
Number
1
Start Page
81
End Page
84
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/16795
DOI
10.1139/w99-111
ISSN
0008-4166
Abstract
Bradyrhizobium japonicum mutant strain NAD163, containing a 30-kb deletion mutant encompassing the hsfA gene, was inoculated onto a broad range of legume species to test host-specificity. Most legume species formed ineffective nodules except Vigna angularis var. Chibopat and Glycine max var. Pureunkong. A hsfA insertion mutant, BjjC211, gave similar results to strain NAD163, implying that many legume species require HsfA for host-specific nitrogen fixation. To determine whether other genes in the deleted region of NAD163 are also necessary, the hsfA gene was conjugally transferred into the NAD163 mutant. The transconjugant formed effective nodules on the host legume plants, which earlier had formed ineffective nodules with mutant NAD163. Thus, we conclude that the hsfA gene in the 30-kb region is the only factor responsible for host-specific nitrogen fixation in legume plants.
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