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Báo cáo khoa học: "Reproduction and gene flow in the genus Quercus"

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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Reproduction and gene flow in the genus Quercus. | Ann Sci For 1993 50 Suppl 1 91s-106s Elsevier INRA 91s Review article Reproduction and gene flow in the genus Quercus L A Ducousso 1 H Michaud 2 R Lumaret 2 INRA BP 45 33611 Gazinet-Cestas 2 CEFE CNRS BP 5051 34033 Montpellier Cedex France Summary In this paper we review the characteristics of the floral biology life cycle and breeding system in the genus Quercus. The species of this genus are self-incompatible and have very long life spans. The focus of our review is on the effects of gene flow on the structuration of genetic variation in these species. We have examined the influence of gene flow in 2 ways 1 by measuring the physical dispersal of pollen seed and vegetative organs and 2 by using nuclear and cytoplasmic markers to estimate genetic parameters Fis Nm . These approaches have shown that nuclear isozyme markers as well as cytoplasmic chloroplastic DNA gene flow is usually high so that very low interspecific differentiation occurs. However intraspecific differentiation is higher for the cytoplasmic DNA than for the nuclear isozyme markers. floral biology life cycle breeding system gene flow I oak Resume Système de reproduction et flux de genes Chez les espèces du genre Quercus. Les caractéristiques de la biologie florale du cycle de vie et du système de reproduction ont été analysées pour les espèces du genre Quercus. Ces espèces sont auto-incompatibles et à très longue durée de vie. Les effets des flux de genes sur la structuration de la variabilité génétique ont aussi été étudlés de 2 manières. D une part grace aux mesures de la dispersion du pollen des graines et des organes vegetatifs et d autre part en utilisant des paramètres génétlques Fis Nm obtenus à partir des marqueurs nucléaires et cytoplasmiques. II apparatt que les flux géniques nu-cléaires isozymes et cytoplasmiques ADN chloroplastique sont en general importants d ou une faible differentiation interspecifique. Néanmolns la differentiation intraspeclfique est plus forte lors-qu elle est .

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