Strength, diversity and plasticity of postmating reproductive barriers between two hybridizing oak species (Quercus robur L. and Quercus petraea (Matt) Liebl.)

Journal of Evolutionary Biology - Tập 25 Số 1 - Trang 157-173 - 2012
Pierre Abadie1,2, Geneviève Roussel1,2, Benjamin Dencausse1,2, Claude-Laurent Bonnet1,2, Evangelista Bertocchi1,2, Jean‐Marc Louvet1,2, Antoine Kremer1,2, Pauline Garnier‐géré1,2
1INRA, UMR 1202 BIOGECO, 69 route d’Arcachon, F-33612 Cestas, France
2Université de Bordeaux, UMR 1202 BIOGECO, 69 route d’Arcachon, F-33612 Cestas, France

Tóm tắt

AbstractVery little is known about the nature and strength of reproductive isolation (RI) in Quercus species, despite extensive research on the estimation and evolutionary significance of hybridization rates. We characterized postmating pre‐ and postzygotic RI between two hybridizing oak species, Quercus robur and Quercus petraea, using a large set of controlled crosses between different genotypes. Various traits potentially associated with reproductive barriers were quantified at several life history stages, from pollen–pistil interactions to seed set and progeny fitness‐related traits. Results indicate strong intrinsic postmating prezygotic barriers, with significant barriers also at the postzygotic level, but relatively weaker extrinsic barriers on early hybrid fitness measures assessed in controlled conditions. Using general linear modelling of common garden data with clonal replicates, we showed that most traits exhibited important genotypic differences, as well as different levels of sensitivity to micro‐environmental heterogeneity. These new findings suggest a large potential genetic diversity and plasticity of reproductive barriers and are confronted with hybridization evidence in these oak species.

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Journal of Evolutionary Biology

Tập 25 Số 1

157-173

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