TheRhizobium melilotiregion located downstream of thenodbox n6 is involved in the specific nodulation ofMedicago lupulina

Autor:	Claire Plazanet, Charles Rosenberg, Guislaine Refrégier, Nathalie Demont, Georges Truchet
Rok vydání:	1995
Předmět:	Genetics Sinorhizobium meliloti Medicago biology Molecular Sequence Data food and beverages Locus (genetics) Gene Expression Regulation Bacterial Nod biology.organism_classification Microbiology Genes Bacterial Regulatory sequence Rhizobium ORFS Molecular Biology Gene Medicago sativa
Zdroj:	FEMS Microbiology Letters. 133:285-291
ISSN:	1574-6968 0378-1097
DOI:	10.1111/j.1574-6968.1995.tb07898.x
Popis:	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.
Databáze:	OpenAIRE
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