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| Gérard, P.R.; Husson, C.; Pinon; Frey, P.. |
| The aims of this study were, first, to compare the genetic and virulence diversity between populations of the rust fungus Melanipsora larici-populina on wild and cultivated poplar stands and, second, to investigate the influence of the presence of the alternate host of the pathogen, larch, on which its sexual reproduction occurs, on these diversities. Nine French M. larici-populina populations collected from poplar trees in autumn and four. populations collected from larch trees during the following spring were analyzed using both virulence factors and neutral markers. In all, 30 pathotypes were identified within the 13 populations studied. The pathotypic structure clearly distinguished the cultivated stands with high richness and complexity from the wild... |
| Tipo: Journal Article |
Palavras-chave: GENETIQUE DES POPULATIONS; ROUILLE; MALADIE DES PLANTES; POUVOIR PATHOGENE; DIVERSITE GENETIQUE; PATHOTYPE; HOTE ALTERNATIF; EPIDEMIOLOGIE BLACK POPLAR; DOMINANT MARKERS; POPULATION GENETICS; RUST EPIDEMICS. |
| Ano: 2006 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007e8ace244&uri=/notices/prodinra1/2007/03/ |
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| Wang, Y.; Tan, Z.; Zhang, D.C.; Murat, C.; Jeandroz, S.; Le Tacon, F.. |
| Phylogenetic relationships between Tuber pseudoexcavatum and other Tuber species were investigated by studying the sequences of four genes: 5.8S-ITS2, btubulin, protein kinase C and elongation factor 1a. The four phylogenetic trees allowed to differentiate the black truffle clade, composed of two subclades, one comprising the Asian black truffles (T. indicum, T. sinense, T. himalayense) and the Perigord black truffle (T. melanosporum), the second comprising T. pseudoexcavatum and T. brumale. These two subclades diverged relatively early. We propose a common ancestor, located between Europe and China, to all the black truffles. The T. brumale/pseudoexcavatum subclade would have started to diverge and migrate first, T. brumale towards Europe through a... |
| Tipo: Journal Article |
Palavras-chave: GENETIQUE DES POPULATIONS; SEQUENCE NULCEOTIDIQUE; BIOGEOGRAPHIE TUBER PSEUDOEXCAVATUM; ITS; BETA-TUBULIN; EF-1ALPHA GENE; PROTEIN KINASE C; PHYLOGENY; BIOGEOGRAPHY. |
| Ano: 2006 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007d3a4a50d&uri=/notices/prodinra1/2008/03/ |
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| Augustin, S.; Bethenod, M.T.; Bourguet, D.; Chaufaux, J.; Courtin, C.; Frerot, B.; Genestier, G.; Genissel, A.; Pelozuelo, L.; Rejasse, A.; Thomas, Y.. |
| Un des risques environnementaux le plus souvent évoqué lors de l'utilisation des plantes transgéniques exprimant une toxine de Bacillus thuringiensis est la sélection d'insectes ravageurs résistants à cette toxine. Dans le cadre de cette ACI, plusieurs paramètres permettant un meilleur ajustement des stratégies de gestion de ces résistances ont été estimés. Nous avons ainsi montré que les fréquences des allèles de résistance aux toxines produites par les maïs Bt dans les populations naturelles de pyrale du maïs du sud de la France et dans celles de la Corn Belt américaine sont < 10-3. En revanche, sur un autre modèle d'étude, la chrysomèle du tremble, nos études montrent que les fréquences d'allèles de résistance aux toxines produites par les peupliers... |
| Tipo: Report section |
Palavras-chave: PLANTE TRANSGENIQUE; RAVAGEUR; RELATION PLANTE INSECTE; RESISTANCE AUX ORGANISMES NUISIBLES; ALLELE DE RESISTANCE; GENETIQUE DES POPULATIONS; BACILLUS THURINGIENSIS; OSTRINIA NUBILALIS; CHRYSOMELA TREMULAE . |
| Ano: 2004 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009febdd9c0&uri=/notices/prodinra1/2009/08/ |
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