Early symbiotic responses induced by Sinorhizobium meliloti ilvC mutants in alfalfa
A mutation in the <i>ilv</i>C gene of <i>Sinorhizobium meliloti</i> 1021 determines a symbiotically defective phenotype, <i>ilv</i>C mutants obtained from different <i>S. meliloti</i> wild-type strains are able to induce root hair deformation on alfalf...
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| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2001
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/83450 |
| Aporte de: |
| Sumario: | A mutation in the <i>ilv</i>C gene of <i>Sinorhizobium meliloti</i> 1021 determines a symbiotically defective phenotype, <i>ilv</i>C mutants obtained from different <i>S. meliloti</i> wild-type strains are able to induce root hair deformation on alfalfa roots and show variable activation of the common nodulation genes <i>nod</i>ABC. All of these mutants are noninfective. The presence of extra copies of <i>nod</i>D3-<i>syr</i>M in an IlvC<SUP>‒</SUP> background does not promote <i>nod</i> expression but allows the detection of low levels of Nod factor production. The sulphation of the Nod factor metabolites, however, is not affected. Furthermore, IlvC<SUP>‒</SUP> strains induce a specific pattern of starch accumulation on alfalfa roots as well as of early nodulin expression. Hence, the pleiotropic action of the <i>ilv</i>C gene in <i>S. meliloti</i> may reveal novel complexities involved in the symbiotic interaction. |
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