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Registros recuperados: 6
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Adaptive evolution of the symbiotic gene NORK is not correlated with shifts of rhizobial specificity in the genus Medicago Inra
De Mita, S.; Ronfort, J.; Santoni, S.; Bataillon, T..
Background: The NODULATION RECEPTOR KINASE (NORK) gene encodes a Leucine-Rich Repeat(LRR)-containing receptor-like protein and controls the infection by symbiotic rhizobia andendomycorrhizal fungi in Legumes. The occurrence of numerous amino acid changes driven bydirectional selection has been reported in this gene, using a limited number of messenger RNAsequences, but the functional reason of these changes remains obscure. The Medicago genus, wherechanges in rhizobial associations have been previously examined, is a good model to test whetherthe evolution of NORK is influenced by rhizobial interactions.Results: We sequenced a region of 3610 nucleotides (encoding a 392 amino acid-long region ofthe NORK protein) in 32 Medicago species. We confirm that...
Tipo: Journal Article Palavras-chave: EVOLUTION ADAPTATIVE; NODULATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200998efe6eb&uri=/notices/prodinra1/2010/12/
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Contrasting patterns of genetic diversity in neutral markers and agromorphological traits in wild and cultivated populations of Medicago sativa L. from Spain Inra
Jenczewski, E.; Angevain, M.; Charrier, A.; Génier, G.; Ronfort, J.; Prospéri, J.M..
L’existence d’un flux génique entre des populations cultivées et sauvages joue souvent un rôle prépondérant dans l’évolution de la diversité génétique de ces dernières. Nous présentons ici une vue générale des niveaux, et de l’organisation de la diversité génétique mesurée sur la base de marqueurs neutres et de caractères agromorphologiques dans des populations sauvages et cultivées de luzerne (M. sativa L.)en Espagne. La plupart des populations sauvages maintiennent une claire originalité agronomique et morphologique bien qu’elles soient parapatriques de populations cultivées et qu’elles fassent parfois l’objet d’introgressions régulières de leur part. Néanmoins notre étude a permis de mettre en évidence un ensemble de populations sauvages moins...
Tipo: Journal Article Palavras-chave: DIVERSTITE GENETIQUE; PLANTE CULTIVEE; MARQUEUR GENETIQUE; ALLOZYME; POLYMORPHISME; SELECTION NATURELLE.
Ano: 1998 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9900008585078467&uri=/notices/prodinra1/2007/07/
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Crop-to-wild gene flow, introgression and possible fitness effects of transgenes Inra
Jenczewski, E.; Ronfort, J.; Chèvre, A.M..
Tipo: Journal Article Palavras-chave: FLUX DE GENE; INTROGRESSION; TRANSFERT DE GENE; PLANTE TRANSGENIQUE; DISPERSION DU POLLEN; RECOMBINAISON GENETIQUE; COMPATIBILITE.
Ano: 2003 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300006768096731&uri=/notices/prodinra1/2009/12/
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How multilocus genotypic pattern helps to understand the history of selfing populations: a case study in Medicago truncatula Inra
Siol, M.; Prosperi, J.M.; Bonnin, I.; Ronfort, J..
The occurrence of populations exhibiting high genetic diversity in predominantly selfing species remains a puzzling question, since under regular selfing genetic diversity is expected to be depleted at a faster rate than under outcrossing. Fine-scale population genetics approaches may help to answer this question. Here we study a natural population of the legume Medicago truncatula in which both the fine-scale spatial structure and the selfing rate are characterized using three different methods. Selfing rate estimates were very high (B99%) irrespective of the method used. A clear pattern of isolation by distance reflecting small seed dispersal distances was detected. Combining genotypic data over loci, we could define 34 multilocus genotypes. Among those,...
Tipo: Journal Article Palavras-chave: MEDICAGO TRUNCATULA.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20093c95b76a&uri=/notices/prodinra1/2009/03/
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Microsatellite diversity and broad scale geographic structure in a model legume: building a set of nested core collection for studying naturally occurring variation in Medicago truncatula Inra
Ronfort, J.; Bataillon, T.; Santoni, S.; Delalande, M.; David, J.L.; Prosperi, J.M..
Background: Exploiting genetic diversity requires previous knowledge of the extent and structure of the variation occurring in a species. Such knowledge can in turn be used to build a corecollection, i.e. a subset of accessions that aim at representing the genetic diversity of this species with a minimum of repetitiveness. We investigate the patterns of genetic diversity and population structure in a collection of 346 inbred lines representing the breadth of naturally occurring diversity in the Legume plant model Medicago truncatula using 13 microsatellite loci distributed throughout the genome.Results: We confirm the uniqueness of all these genotypes and reveal a large amount of genetic diversity and allelic variation within this autogamous species....
Tipo: Journal Article Palavras-chave: MEDICAGO TRUNCATULA.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007b7fe3f4e&uri=/notices/prodinra1/2010/12/
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Molecular evolution and positive selection of the symbiotic gene NORK in Medicago truncatula Inra
De Mita, S.; Santoni, S.; Hochu, I.; Ronfort, J.; Bataillon, T..
Understanding the selective constraints of partner specificity in mutually beneficial symbiosis is a significant, yet largely unexplored, prospect of evolutionary biology. These selective constraints can be explored through the study of nucleotide polymorphism at loci controlling specificity. The membrane-anchored receptor NORK (nodulation receptor kinase) of the legume Medicago truncatula controls early steps of root infection by two symbiotic microorganisms: nitrogen-fixing bacteria (rhizobia) and endomycorrhizal fungi (Glomales). We analyzed the diversity of the gene NORK by sequencing 4 kilobases in 28 inbred lines sampled from natural populations. We detected 33 polymorphic sites with only one nonsynonymous change. Analysis based on Tajima’s D and Fay...
Tipo: Journal Article Palavras-chave: POLYMORPHISME SYMBIOSIS; MEDICAGO TRUNCATULA; RHIZOBIUM; NEUTRAL THEORY; POSITIVE SELECTION; NODULATION RECEPTOR KINASE.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007dfa472fb&uri=/notices/prodinra1/2010/11/
Registros recuperados: 6
Primeira ... 1 ... Última
 

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