Yasmina Bahloul - Academia.edu (original) (raw)

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Papers by Yasmina Bahloul

Beet wild genetic resources are widely spread along the Atlantic ocean, Mediterranean region and ... more Beet wild genetic resources are widely spread along the Atlantic ocean, Mediterranean region and a part of Asia. Very little is known about existing species and their genetic structure in Morocco.

L'arganier (Argania spinosa (L.) Skeels) est un arbre endémique au Maroc, sa forêt s'étend sur en... more L'arganier (Argania spinosa (L.) Skeels) est un arbre endémique au Maroc, sa forêt s'étend sur environ 820 000 ha, dans le triangle formé par Essaouira, Agadir et Taroudant. Cet arbre de la famille des Sapotacées, est particulièrement résistant aux conditions sèches et arides de cette région. Malheureusement, victime de l'évolution du mode de vie rural et du climat, l'arganeraie est fragilisée. Toutefois, il n'existe pas une collection centralisée de génotypes qui permettrait de conserver et d'utiliser le matériel génétique adapté aux différentes conditions. C'est pour cette raison que dans ce travail, nous nous intéresserons au développement des marqueurs moléculaires polymorphes de type microsatellites, chez Argania spinosa afin de participer avec de nouveaux outils à caractériser et analyser la diversité génétique de l'arganier.

Applications in Plant Sciences, 2014

Ecology and Evolution, 2014

Understanding the factors that contribute to population genetic divergence across a species' rang... more Understanding the factors that contribute to population genetic divergence across a species' range is a long-standing goal in evolutionary biology and ecological genetics. We examined the relative importance of historical and ecological features in shaping the present-day spatial patterns of genetic structure in two related plant species, Beta vulgaris subsp. maritima and Beta macrocarpa. Using nuclear and mitochondrial markers, we surveyed 93 populations from Brittany (France) to Moroccothe southern limit of their species' range distribution. Whereas B. macrocarpa showed a genotypic structure and a high level of genetic differentiation indicative of selfing, the population genetic structure of B. vulgaris subsp. maritima was consistent with an outcrossing mating system. We further showed (1) a strong geographic clustering in coastal B. vulgaris subsp. maritima populations that highlighted the influence of marine currents in shaping different lineages and (2) a peculiar genetic structure of inland B. vulgaris subsp. maritima populations that could indicate the admixture of distinct evolutionary lineages and recent expansions associated with anthropogenic disturbances. Spatial patterns of nuclear diversity and differentiation also supported a stepwise recolonization of Europe from Atlantic-Mediterranean refugia after the last glacial period, with leading-edge expansions. However, cytoplasmic diversity was not impacted by postglacial recolonization: stochastic long-distance seed dispersal mediated by major oceanic currents may mitigate the common patterns of reduced cytoplasmic diversity observed for edge populations. Overall, the patterns we documented here challenge the general view of reduced genetic diversity at the edge of a species' range distribution and provide clues for understanding how life-history and major geographic features interact to shape the distribution of genetic diversity.