Horizontal Transfer of Nodulation Genes in Soils and Microcosms from Bradyrhizobium japonicum to B. elkanii

Autor:	Masako Suzuki, Tsuyoshi Isawa, Kazunori Ichige, Ken-Ichi Yuhashi, Kiwamu Minamisawa, Manabu Itakura, Hisayuki Mitsui
Rok vydání:	2002
Předmět:	Soil Science Plant Science General Medicine Nod Biology biology.organism_classification Microbiology Nod factor Plasmid Horizontal gene transfer Insertion sequence Gene Ecology Evolution Behavior and Systematics Bradyrhizobium elkanii Bradyrhizobium japonicum
Zdroj:	Microbes and Environments. 17:82-90
ISSN:	1347-4405 1342-6311
DOI:	10.1264/jsme2.2002.82
Popis:	We investigated the horizontal transfer of nodulation (nod) genes to a Bradyrhizobium elkanii strain, lacking common nod genes as a recipient, in soils and microcosms using selection systems of antibiotic resistance and legume nodulation. We observed the horizontal transfer of nod genes at 4C in Nakazawa soil where peculiar strains (HRS strains) of B. japonicum harboring high copy numbers of insertion sequences dominated. In microcosms containing HRS strains as donors, we detected a similar horizontal transfer from B. japonicum HRS strain NK5 to the B. elkanii recipient more efficiently at 4C, which was verified by examining hybridization, nodulation and Nod factor production. These traits were, however, gradually lost during successive cultures. Plasmid analysis indicated that this event was not due to the simple transfer of plasmid carrying common nod genes. These results suggest the potential for horizontal transfer of nod genes among bradyrhizobia and other bacterial populations in soil environments.
Databáze:	OpenAIRE
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