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Descripción
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| The formation of symbiotic nitrogen-fixing nodules on the roots of leguminous plants induced by rhizobia involves a complex signal exchange between both partners. Since many microorganisms are present in the soil, legumes and rhizobia must specifically recognize each other to establish symbioses. Among the signals interchanged there are bacterial proteins (effectors) transported to the plant cytoplasm by means of specific devices called secretion systems. Recently, a new secretion system was recognized, and was named type VI secretion system (T6SS). In general, the structural elements of T6SSs are encoded by a cluster with a variable number that are conserved in different bacteria (Nelson et al., 2015). This system is very important in animal and plant pathogen but its function in rhizobial symbiosis is unknown. The analysis of genomic sequences of some Bradyrhizobium strains isolated from Lupinus spp. in our group allowed the identification of one or two copies of T6SS per genome. The strain Bradyrhizobium sp. LmicA16 induces formation of nitrogen-fixing nodules with their host L. micranthus and with many other legumes as L. angustifolius and Spartium junceum. This strain contains one T6SS encoded in a cluster of 16 genes named imp. Mutagenesis of structural genes impC and impO, produced abundant nodules but less effective than the wild type strain on L. micranthus symbiosis, but induced the formation of few white, non-fixing nodules in the roots of L. angustifolius and Spartium junceum. These results suggest that T6SS has an effect on host specificity and simbiosis. | |
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Internacional
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Si |
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Nombre congreso
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Workshop New Frontiers in Plant Biology |
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Tipo de participación
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970 |
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Lugar del congreso
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Centro de Biotecnología y Genómica de Plantas |
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Revisores
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Si |
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ISBN o ISSN
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0000-0000 |
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DOI
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Fecha inicio congreso
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15/06/2016 |
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Fecha fin congreso
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17/06/2016 |
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Desde la página
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4 |
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Hasta la página
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4 |
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Título de las actas
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Analysis of type VI secretion system from Bradyrhizobium sp. LmicA16 in symbiosis with Lupinus micranthus |