The Rhizobium meliloti region located downstream of the nod box n6 is involved in the specific nodulation of Medicago lupulina.
FEMS Microbiol Lett
; 133(3): 285-91, 1995 Nov 15.
Article
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| MEDLINE
| ID: mdl-8522144
Six nod box regulatory sequences are present in the Rhizobium meliloti genome. We have analysed the DNA region located downstream of nod box n6, and identified three open reading frames, designated nolQa, nolQb and nolS. LacZ fusions in these ORFs are not induced by classical nod gene inducers, which indicates that their expression either is not under the control of the nod box, or involves another regulatory mechanism acting in conjunction with the NodD/nod box regulatory circuit. Mutations in this n6 locus result in a delay in nodule formation on a particular host, Medicago lupulina. As this region is not strictly conserved among different R. meliloti strains, nolQa, nolQb and nolS may constitute auxiliary nodulation genes, for which the selection pressure is limited to particular host plants.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sinorhizobium meliloti
/
Genes Bacterianos
Idioma:
En
Revista:
FEMS Microbiol Lett
Año:
1995
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Reino Unido