Cloning and Mapping of a Novel Nodulation Region from Bradyrhizobium japonicum by Genetic Complementation of a Deletion Mutant.
Appl Environ Microbiol
; 54(1): 55-61, 1988 Jan.
Article
em En
| MEDLINE
| ID: mdl-16347539
ABSTRACT
The phenotypes of a set of Bradyrhizobium japonicum 110 mutants with large deletions in the region of symbiotic gene cluster I were tested. The majority of the mutants showed a delayed nodulation on soybean and, by mixed-infection experiments, were found to be strongly reduced in their competitiveness. Phenotypic comparison of mutants with different deletion endpoints allowed a preliminary localization of two genomic regions, called nod-1 and nod-2, which were required for normal nodulation on soybean. Loss of nod-1 was found to result in a Nod phenotype on cowpea, mung bean, and siratro. A recombinant cosmid was identified which fully restored nodulation ability of a mutant lacking nod-1. Using Tn5-containing derivatives and subclones of this cosmid for complementation, we delimited the nod-1 region to a DNA segment of 3.1 to 3.5 kilobase pairs.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
1988
Tipo de documento:
Article