Kazmierczak, T. and Nagymihaly, M. and Lamouche, F. and Barriére, Q. and Guefrachi, I. and Alunni, B. and Ouadghiri, M. and Ibijbijen, J. and Kondorosi, E. and Mergaert, P. and Gruber, V. (2017) Specific host-responsive associations between medicago truncatula accessions and sinorhizobium strains. Molecular Plant-Microbe Interactions, 30 (5). pp. 399-409.

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Legume plants interact with rhizobia to form nitrogen-fixing root nodules. Legume-rhizobium interactions are specific and only compatible rhizobia and plant species will lead to nodule formation. Even within compatible interactions, the genotype of both the plant and the bacterial symbiont will impact on the efficiency of nodule functioning and nitrogen-fixation activity. The model legume Medicago truncatula forms nodules with several species of the Sinorhizobium genus.However, the efficiency of these bacterial strains is highly variable. In this study, we compared the symbiotic efficiency of Sinorhizobium meliloti strains Sm1021, 102F34, and FSM-MA, and Sinorhizobium medicae strain WSM419 on the two widely used M.Truncatula accessions A17 and R108. The efficiency of the interactions was determined by multiple parameters. We found a high effectiveness of the FSM-MA strain with both M.Truncatula accessions. In contrast, specific highly efficient interactions were obtained for the A17-WSM419 and R108-102F34 combinations. Remarkably, the widely used Sm1021 strain performed weakly on both hosts. We showed that Sm1021 efficiently induced nodule organogenesis but cannot fully activate the differentiation of the symbiotic nodule cells, explaining its weaker performance. These results will be informative for the selection of appropriate rhizobium strains in functional studies on symbiosis using these M.Truncatula accessions, particularly for research focusing on late stages of the nodulation process. © 2017 The American Phytopathological Society.

Item Type: Article
Uncontrolled Keywords: barrel medic; cell differentiation; ecotype; gene expression regulation; genetics; growth, development and aging; kinetics; microbiology; nitrogen fixation; nodulation; phenotype; physiology; ploidy; Sinorhizobium; symbiosis, Cell Differentiation; Ecotype; Gene Expression Regulation, Plant; Kinetics; Medicago truncatula; Nitrogen Fixation; Phenotype; Ploidies; Root Nodules, Plant; Sinorhizobium; Symbiosis
Subjects: Agricultural and Biological Sciences
Divisions: SCIENTIFIC PRODUCTION > Agricultural and Biological Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:44
URI: http://eprints.umi.ac.ma/id/eprint/1333

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