Search

Your search keyword '"Ansan-Melayah, D."' showing total 15 results
Start Over Author "Ansan-Melayah, D."
15 results on '"Ansan-Melayah, D."'

2. Analysis of molecular markers genetically linked to the leptosphaeria maculans avirulence gene AvrLm1 n field populations indicates a highly conserved event leading to virulence on Rlm1 genotypes

Author

Attard, Agnès, Gout, Lilian, Gourgues, M., Kuhn, M.L., Schmit, Jacques, Laroche, Sandrine, Ansan-Melayah, D., Billault, Arnaud, CATTOLICO, L., Balesdent, Marie-Helene, Rouxel, Thierry, ProdInra, Migration, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), and Institut National de la Recherche Agronomique (INRA)

Subjects
[SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, ComputingMilieux_MISCELLANEOUS, RESISTANCE
Abstract

International audience

Published
2002

3. Genetic control and host range of avirulence toward Brassica napus cultivars Quinta and Jet Neuf in Leptosphaeria maculans

Author

Balesdent, Marie-Helene, Attard, Agnès, Ansan-Melayah, D., Delourme, Régine, Renard, M., Rouxel, Thierry, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), UMR 0118 UMR INRA / ENSAR : Génétique et amélioration des plantes, Institut National de la Recherche Agronomique (INRA)-Génétique et amélioration des plantes (G.A.P.)-UMR INRA / ENSAR : Génétique et amélioration des plantes (RENN UMR GENET AMELIOR PLANTES), and ProdInra, Migration

Subjects
POUVOIR PATHOGENE, [SDV.BV.PEP] Life Sciences [q-bio]/Vegetal Biology/Phytopathology and phytopharmacy, ComputingMilieux_MISCELLANEOUS, [SDV.BV.PEP]Life Sciences [q-bio]/Vegetal Biology/Phytopathology and phytopharmacy
Abstract

International audience

Published
2001

4. Gene-for-gene interaction in the Leptosphaeria maculans-Brassica napus pathosystem

Author

Ansan-Melayah, D., Balesdent, Marie-Helene, Delourme, Régine, Pilet-Nayel, Marie-Laure, Tanguy, X., Renard, M., Rouxel, Thierry, Pathologie Végétale (PaVé), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), UMR 0118 UMR INRA / ENSAR : Génétique et amélioration des plantes, and Institut National de la Recherche Agronomique (INRA)-Génétique et amélioration des plantes (G.A.P.)-UMR INRA / ENSAR : Génétique et amélioration des plantes (RENN UMR GENET AMELIOR PLANTES)

Subjects
[SDV]Life Sciences [q-bio], RELATION HOTE PATHOGENE, COLZA, RESISTANCE GENETIQUE, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1998

5. Carte génétique et marquage moléculaire du gène d'avirulence AvrLm1 chez l'ascomycète phytopathogène, Leptosphaeria maculans

Author

Balesdent, Marie-Helene, Ansan-Melayah, D., Olivier, M.L., Rouxel, Thierry, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], POUVOIR PATHOGENE, [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1997

6. Phoma du colza. Des résistances spécifiques exploitables chez le colza

Author

Ansan-Melayah, D., Balesdent, Marie-Helene, Bertrandy, Jean, LETARNEC, Bruno, MENDES-PEREIRA, E., Rouxel, Thierry, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], POUVOIR PATHOGENE, [SDV]Life Sciences [q-bio], RELATION HOTE PATHOGENE, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
1997

7. Field efficiency of Brassica napus specific resistance correlates with Leptosphaeria maculans population structure

Author

Ansan-Melayah, D., Rouxel, Thierry, Bertrandy, Jean, LETARNEC, Bruno, MENDES-PEREIRA, E., Balesdent, Marie-Helene, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], POUVOIR PATHOGENE, [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1997

8. Perspectives d'amelioration de la résistance du colza au phoma

Author

Renard, M., Chèvre, Anne-Marie, Delourme, Régine, Barret, P., Eber, Frédérique, Pilet-Nayel, Marie-Laure, Tanguy, X., Horvais, Raymonde, Pelletier, G., Primard, C., Beclin, Christophe, Brun, Hortense, Roussel, S., Somda, I., Levivier, S., Rouxel, Thierry, Balesdent, Marie-Helene, Ansan-Melayah, D., UMR 0118 UMR INRA / ENSAR : Génétique et amélioration des plantes, Institut National de la Recherche Agronomique (INRA)-Génétique et amélioration des plantes (G.A.P.)-UMR INRA / ENSAR : Génétique et amélioration des plantes (RENN UMR GENET AMELIOR PLANTES), Unité de recherche Génétique et amélioration des plantes (GAP), Institut National de la Recherche Agronomique (INRA), Biologie des organismes et des populations appliquées à la protection des plantes (BIO3P), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de la Recherche Agronomique (INRA), Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), and Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST

Subjects
PHOMA LINGUAM, [SDV]Life Sciences [q-bio], COLZA, RESISTANCE GENETIQUE, ComputingMilieux_MISCELLANEOUS
Abstract

*INRA, Rennes-Documentation, BP 29, 35653 Le Rheu Cedex Diffusion du document : INRA, Rennes-Documentation, BP 29, 35653 Le Rheu Cedex; International audience

Published
1996

9. Genetic analysis of two race-cultivar specific interactions in the leptosphaeria maculans / brassica napus pathosystem

Author

Ansan-Melayah, D., ProdInra, Migration, Station de pathologie végétale, Institut National de la Recherche Agronomique (INRA), Université Paris Sud - Paris 11, and Thierry Rouxel

Subjects
[SDV] Life Sciences [q-bio], POUVOIR PATHOGENE, [SDV]Life Sciences [q-bio], these
Abstract

non disponible, Leptosphaeria maculans est un ascomycete filamenteux responsable de la necrose du collet des cruciferes, maladie dommageable sur colza (brassica napus l. ). Depuis peu, des interactions specifiques sont decrites sur les cultivars de colza westar, quinta et glacier, discriminant les souches de l. Maculans en 3 pathogenicity groups (pg). Cette etude s'est proposee, en un premier temps, de caracteriser le determinisme genetique de deux interactions tant du cote de l'agent pathogene que de la plante. Par une analyse de tetrades, deux genes d'avirulence, avrlm1 et avrlm2, responsables des interactions incompatibles pg3-quinta et pg2-glacier sont mis en evidence. En parallele, l'analyse des descendances issues des croisements entre quinta, glacier et un cultivar sensible indique la presence de loci majeurs dominants de resistance, rlm1 et rlm2, correspondants a avrlm1 et avrlm2. Ces resultats demontrent pour la premiere fois chez le pathosysteme l. Maculans/b. Napus l'existence de relations gene-pour-gene. Dans un second temps, l'efficacite des resistances de quinta et glacier a ete eprouvee en conditions naturelles durant deux annees consecutives. Le bon niveau de resistance de quinta est correle a la predominance des souches pg3 dans la population locale du parasite. A l'oppose, la sensibilite de glacier est expliquee par l'absence de souches pg2. Enfin, en vue du clonage ulterieur du gene d'avirulence avrlm1 par marche chromosomique, une carte genetique de l. Maculans a ete initiee. La segregation d'avrlm1, mat, spp et 89 marqueurs rapd a ete examinee chez 88 descendants en vrac. Un groupe de liaison majeur associe avrlm1 avec 4 autres marqueurs, ad1-1,52 et j19-1,20 encadrant le locus a 4,8 cm et 1,5 cm. En complement, pour faire coincider a terme les cartes genetique et physique, les caryotypes des souches parentales ont ete etablis par pfge. L'hybridation de ad1-1,52 sur les electrocaryotypes suggere qu'avrlm1 est porte par le chromosome v du parent pg3

Published
1996

10. Blackleg disease pathogens and their interactions with Brassicas

Author

Rouxel, Thierry, Ansan-Melayah, D., Balesdent, Marie-Helene, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], RELATION HOTE PATHOGENE, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1995

11. Genetic characterization of AvrLm1, the first avirulence gene of Leptosphaeria maculans

Author

Ansan-Melayah, D., Balesdent, Marie-Helene, Buee, Marc, Rouxel, Thierry, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], POUVOIR PATHOGENE, [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1995

12. Des résistances spécifiques à Leptosphaeria maculans exploitables chez le colza

Author

Ansan-Melayah, D., Balesdent, Marie-Helene, Renard, M., Tanguy, X., Rouxel, Thierry, Unité de recherche Phytopathologie et Méthodologies de la Détection (PMDV), Institut National de la Recherche Agronomique (INRA), UMR 0118 UMR INRA / ENSAR : Génétique et amélioration des plantes, Institut National de la Recherche Agronomique (INRA)-Génétique et amélioration des plantes (G.A.P.)-UMR INRA / ENSAR : Génétique et amélioration des plantes (RENN UMR GENET AMELIOR PLANTES), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], COLZA, RESISTANCE GENETIQUE, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1994

14. Analysis of molecular markers genetically linked to the Leptosphaeria maculans avirulence gene AvrLm1 in field populations indicates a highly conserved event leading to virulence on Rlm1 genotypes.

Author

Attard A, Gout L, Gourgues M, Kühn ML, Schmit J, Laroche S, Ansan-Melayah D, Billault A, Cattolico L, Balesdent MH, and Rouxel T

Subjects
Ascomycota pathogenicity, Base Sequence, Chromosomes, Artificial, Bacterial, DNA Primers, Molecular Sequence Data, Phenotype, Ascomycota genetics, Genes, Fungal, Genetic Linkage, Genetic Markers, Genotype, Virulence genetics
Abstract

Map-based cloning of the avirulence gene AvrLm1 of Leptosphaeria maculans was initiated utilizing a genetic map of the fungus and a BAC library constructed from an AvrLm1 isolate. Seven polymorphic DNA markers closely linked to AvrLm1 were identified. Of these, two were shown to border the locus on its 5' end and were present, with size polymorphism, in both the virulent and the avirulent isolates. In contrast, three markers, J19-1.1, J53-1.3 (in coupling phase with avirulence), and Vir1 (in repulsion phase with avirulence), cosegregated with AvrLm1 in 312 progeny from five in vitro crosses. J19-1.1 and J53-1.3 were never amplified in the virulent parents or progeny, whereas Vir1 was never amplified in the avirulent parents or progeny. J19-1.1 and J53-1.3 were shown to be separated by 40 kb within a 184-kb BAC contig. In addition, the 1.6-cM genetic distance between J53-1.3 and the nearest recombinant marker corresponded to a 121-kb physical distance. When analyzing a European Union-wide collection of 192 isolates, J53-1.3, J19-1.1, and Vir1 were found to be closely associated with the AvrLm1 locus. The results of polymerase chain reaction amplification with primers for the three markers were in accordance with the interaction phenotype for 92.2% (J53-1.3), 90.6% (J19-1.1), and 88.0% (Vir1) of the isolates. In addition, genome organization of the AvrLm1 region was highly conserved in field isolates, because 89.1% of the avirulent isolates and 79.0% of the virulent isolates showed the same association of markers as that of the parents of in vitro crosses. The large-scale analysis of field isolates with markers originating from the genetic map therefore confirms (i) the physical proximity between the markers and the target locus and (ii) that AvrLm1 is located in (or close to) a recombination-deficient genome region. As a consequence, map-based markers provided us with high-quality markers for an overview of the occurrence of race "AvrLm1" at the field scale. These data were used to propose hypotheses on evolution towards virulence in field isolates.

Published
2002
Full Text
View/download PDF

15. Genetic Control and Host Range of Avirulence Toward Brassica napus Cultivars Quinta and Jet Neuf in Leptosphaeria maculans.

Author

Balesdent MH, Attard A, Ansan-Melayah D, Delourme R, Renard M, and Rouxel T

Abstract

ABSTRACT Leptosphaeria maculans causes blackleg of oilseed rape. Gene-for-gene interactions between race PG3 and Brassica napus cv. Quinta were related to interaction between the fungal avirulence (Avr) gene AvrLm1 and the corresponding resistance gene Rlm1. AvrLm1 isolates were aviru-lent on cvs. Doublol, Vivol, Columbus, and Capitol, and no recombinant phenotypes were observed in the progeny of two AvrLm1 x avrLm1 crosses, suggesting that all of these cultivars may possess Rlm1 or genes displaying the same recognition spectrum, or that a cluster of Avr genes is present at the Avrlm1 locus. In one cross, segregation distortion was observed at the AvrLm1 locus that could be explained by interaction between AvrLm1 and one unlinked deleterious gene, termed Del1. Incompatibility toward cvs. Jet Neuf and Darmor.bzh was governed by a single gene, unlinked to AvrLm1 or Del1. This avirulence gene was termed AvrLm4. Preliminary plant genetic analysis suggested the occurrence of a corresponding dominant resistance gene, termed Rlm4, present in the Quinta line analyzed and linked to Rlm1.

Published
2001
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results