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    • Article
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    Distribution des cytodèmes d'Anthoxanthum odoratum L.s. lat. en France et dans les régions limitrophes

    Felber, François
    Bulletin de la Societe Botanique de France. - 1988/135//281-293
    1988
    Disponible
    Plus…
    Titre: Distribution des cytodèmes d'Anthoxanthum odoratum L.s. lat. en France et dans les régions limitrophes
    Auteur: Felber, François
    Date: 1988
    Publication en relation: Bulletin de la Societe Botanique de France. - 1988/135//281-293
    Document hôte: Bulletin de la Societe Botanique de France
    Identifiant: (DOI)

    • Article
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    Establishment of a tetraploid cytotype in a diploid population : effect of relative fitness of the cytotypes

    Felber, François
    Journal of evolutionary biology. - 1991/4/2/195-207
    1991
    Disponible
    Plus…
    Titre: Establishment of a tetraploid cytotype in a diploid population : effect of relative fitness of the cytotypes
    Auteur: Felber, François
    Date: 1991
    Sujet: population genetics - theoretical model - polyploidy - 2n gametes
    Description: The conditions for the establishment of a tetraploid in a diploid population were investigated by means of a deterministic model, on the assumption that the diploid cytotype produces some 2n gametes. If the fertility and viability of both cytotypes were the same and the initial population was diploid, then a mixed population would occur if the production of 2n gametes was below 17.16%. The tetraploid excluded the diploid above this limit. By modifying the fertility and the viability of the polyploid this threshold varied, dropping to 10% when one of the two parameters was twice that of the diploid, and falling to as low as 6% if both fertility and viability were double that of the diploid. The conditions for the establishment of a polyploid are therefore quite restrictive under the assumptions of this model. In nature, such processes would probably allow the spread of the polyploid only if the immigration of polyploids considerably enhanced the frequency of tetraploids, or if genetical or environmental changes, or chance processes in small populations caused a substantial increase in the frequency of 2n gametes produced by the diploid.
    Publication en relation: Journal of evolutionary biology. - 1991/4/2/195-207
    Document hôte: Journal of evolutionary biology
    Identifiant: 10.1046/j.1420-9101.1991.4020195.x (DOI)

    • Article
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    Titre: Sensitivity of the Four Cytodemes of Anthoxanthum Odoratum L. S. Lat. (Poaceae) to Puccina Sardonensis Gäumann (Uredinales)
    Auteur: Felber, François
    Date: 1987
    Publication en relation: Taxon. - 1987/36/3/573-577
    Document hôte: Taxon
    Identifiant: (DOI)

    • Article
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    Phénologie de la floraison de populations diploïdes et tétraploïdes d'Anthoxanthum alpinum et d'Anthoxanthum odoratum

    Felber, François
    Journal canadien de botanique. - 1988/66/11/2258-2264
    1988
    Disponible
    Plus…
    Titre: Phénologie de la floraison de populations diploïdes et tétraploïdes d'Anthoxanthum alpinum et d'Anthoxanthum odoratum
    Auteur: Felber, François
    Date: 1988
    Description: La phénologie de la floraison a été étudiée, en jardin expérimental, sur des populations diploïdes et tétraploïdes d'Anthoxanthum alpinum A. & D. Löve et d'A. odoratum L. du centre et du sud de l'Europe ainsi que, in situ, dans une zone de contact entre l'A. alpinum diploïde et l'A. odoratum tétraploïde. En jardin expérimental, les paramètres phénologiques ont été étudiés au niveau de l'individu (début de la floraison) et à l'échelle de la population (dates auxquelles 40, 50, 60, 70 ou 80% des plantes de chaque population offrent pour la première fois des étamines mûres). L'Anthoxanthum alpinum fleurit plus tôt que l'A. odoratum et ceci indépendamment de leurs valences chromosomiques respectives Le délai moyen entre l'apparition des stigmates et celle des étamines est de l'ordre de 2 jours pour les deux taxons d'A. alpinum, et de 6 jours pour ceux d'A. odoratum. L'étalement de la floraison le plus important a été observé pour l'A. odoratum tétraploïde, ce qui atteste la grande variabilité phénologique de ce taxon. L'étude in situ confirme la précocité de l'A. alpinum. La différenciation phénologique au sein de ce complexe polyploïde serait contemporaine de l'individualisation des deux taxons diploïdes mais antérieure à leurs phases respectives de polyploïdisation.
    The phenology of flowering was studied in an experimental garden, on diploid and tetraploid populations of Anthoxanthum alpinum A. & D. Löve and of A. odoratum L. of central and southern Europe and also in situ in a contact zone between diploid A. alpinum and tetraploid A. odoratum. In the experimental garden, the phenological parameters were studied at the individual level (onset of flowering) and at the population level (dates on which each population showed opened anthers for the first time on 40, 50, 60, 70, or 80% of the plants). Anthoxanthum alpinum flowered earlier than A. odoratum, regardless of the respective ploidy level of the two taxa. The average time lag between the appearance of the stigma and that of the stamens was about 2 days for the two A. alpinum taxa and 6 days for those of A. odoratum. Flowering was spread over the longest period for the tetraploid A. odoratum, which shows the great phenological variability of this taxon. The in situ study confirms the precocity of A. alpinum. The phenological differentiation within this polyploid complex probably coincides with the individualization of the two diploid taxa but precedes their respective polyploidization phases.
    Publication en relation: Journal canadien de botanique. - 1988/66/11/2258-2264
    Document hôte: Journal canadien de botanique
    Identifiant: (DOI)

    • Article
    Sélectionner

    Establishment of a tetraploid cytotype in a diploid population : effect of relative fitness of the cytotypes

    Felber, François
    Journal of evolutionary biology. - 1991/4/2/195-207
    1991
    Disponible
    Plus…
    Titre: Establishment of a tetraploid cytotype in a diploid population : effect of relative fitness of the cytotypes
    Auteur: Felber, François
    Date: 1991
    Sujet: population genetics - theoretical model - polyploidy - 2n gametes
    Description: The conditions for the establishment of a tetraploid in a diploid population were investigated by means of a deterministic model, on the assumption that the diploid cytotype produces some 2n gametes. If the fertility and viability of both cytotypes were the same and the initial population was diploid, then a mixed population would occur if the production of 2n gametes was below 17.16%. The tetraploid excluded the diploid above this limit. By modifying the fertility and the viability of the polyploid this threshold varied, dropping to 10% when one of the two parameters was twice that of the diploid, and falling to as low as 6% if both fertility and viability were double that of the diploid. The conditions for the establishment of a polyploid are therefore quite restrictive under the assumptions of this model. In nature, such processes would probably allow the spread of the polyploid only if the immigration of polyploids considerably enhanced the frequency of tetraploids, or if genetical or environmental changes, or chance processes in small populations caused a substantial increase in the frequency of 2n gametes produced by the diploid.
    Publication en relation: Journal of evolutionary biology. - 1991/4/2/195-207
    Document hôte: Journal of evolutionary biology
    Identifiant: 10.1046/j.1420-9101.1991.4020195.x (DOI)

    • Article
    Sélectionner

    Distribution des cytodèmes d'Anthoxanthum odoratum L.s. lat. en France et dans les régions limitrophes

    Felber, François
    Bulletin de la Societe Botanique de France. - 1988/135//281-293
    1988
    Disponible
    Plus…
    Titre: Distribution des cytodèmes d'Anthoxanthum odoratum L.s. lat. en France et dans les régions limitrophes
    Auteur: Felber, François
    Date: 1988
    Publication en relation: Bulletin de la Societe Botanique de France. - 1988/135//281-293
    Document hôte: Bulletin de la Societe Botanique de France
    Identifiant: (DOI)

    • Plusieurs versions

    Contrasting evolutionary trajectories of multiple retrotransposons following independent allopolyploidy in wild wheats

    Senerchia, Natacha, Felber, François, Parisod, Christian
    New Phytologist, May 2014, Vol.202(3), pp.975-985 [Revue évaluée par les pairs]

    • Article
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    Effect of triploid fitness on the coexistence of diploids and tetraploids

    Felber, François
    Bever, James D
    Biological Journal of the Linnean Society. - 1997/60/1/95-106
    1997
    Disponible
    Plus…
    Titre: Effect of triploid fitness on the coexistence of diploids and tetraploids
    Auteur: Felber, François
    Contributeur: Bever, James D
    Date: 1997
    Description: The conditions for the coexistence of diploids, triploids and tetraploids in a single population were investigated with a deterministic model under the assumptions that diploids might produce 2n gametes, and that triploids had a lower fitness than other cytotypes and generated equal proportions of haploid and diploid gametes. When diploids produced only haploid gametes, the dynamics of the cytotypes were similar to that of heterozygote disadvantage with two alleles at a single locus, with triploids being equivalent to the heterozygotes. Production of 2n gametes by diploids increased the pool of diploid gametes and created a stable equilibrium involving a majority of diploids and a minority of polyploids. When the fitness of tetraploids was equal to or higher than that of diploids, increased triploid fitness decreased the threshold of 2n gametes necessary to deterministically fix tetraploids in the population. Conversely, when tetraploids were less fit than diploids, the rate of 2n gamete production leading to the exclusion of diploids first decreases and then increased with increasing triploid fitness. Triploids are repeatedly found in diploid-tetraploid hybridizations and are rarely totally sterile. They might play a determinant role in the future of multiple cytotype populations. The effect of triploids depends on the relative fitness of diploids and tetraploids and is also a function of their fitness.
    Publication en relation: Biological Journal of the Linnean Society. - 1997/60/1/95-106
    Document hôte: Biological Journal of the Linnean Society
    Identifiant: 10.1006/bijl.1996.0090 (DOI)

    • Plusieurs versions

    Differential introgression and reorganization of retrotransposons in hybrid zones between wild wheats

    Senerchia, Natacha, Felber, François, North, Béatrice, Sarr, Anouk, Guadagnuolo, Roberto, Parisod, Christian
    Molecular Ecology, June 2016, Vol.25(11), pp.2518-2528 [Revue évaluée par les pairs]

    • Article
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    Gene flow from wheat (Triticum aestivum L.) to jointed goatgrass (Aegilops cylindrica Host.), as revealed by RAPD and microsatellite markers

    Guadagnuolo, Roberto
    Savova-Bianchi, D, Felber, François
    TAG Theoretical and Applied Genetics. - 2001/103/1/1-8
    2001
    Disponible
    Plus…
    Titre: Gene flow from wheat (Triticum aestivum L.) to jointed goatgrass (Aegilops cylindrica Host.), as revealed by RAPD and microsatellite markers
    Auteur: Guadagnuolo, Roberto
    Contributeur: Savova-Bianchi, D; Felber, François
    Date: 2001
    Sujet: gene flow - risk assessment - introgression - wheat - jointed goatgrass
    Description: In order to estimate the potential of gene flow between wheat (Triticum æstivum L.) and jointed goatgrass (Aegilops cylindrica Host.), we carried out mixed pollinations in experimental and natural conditions. A set of species-specific RAPD (random amplified polymorphic DNA) and microsatellite markers were used to detect the presence of parental markers in the progeny of the plants used in these experiments. No hybrids were found within the offsprings of the plants used for the greenhouse experiments, while 85 Ae. cylindrica×T. æstivum hybrids were found within 2400 analyzed F1 plants resulting from the field pollinations. The hybridization rates for individuals of different populations of the wild species differed considerably: 1% for two populations known for more than 90 years versus 7% for a newly discovered population. Most of the hybrids were completely sterile, but five of them produced 13 seeds (BC1) by backcross with Ae. cylindrica. Twelve seeds germinated and generated viable and partly fertile plants. About 25% of the wheat specific RAPD markers were found in the BC1 plants, indicating that introgression of wheat DNA into Ae. cylindrica is possible. In addition, one microsatellite marker, known to be situated on the D genome (a genome shared by both species), was also found in the BC1 plants.
    Publication en relation: TAG Theoretical and Applied Genetics. - 2001/103/1/1-8
    Document hôte: TAG Theoretical and Applied Genetics
    Identifiant: 10.1007/s001220100636 (DOI)