TAILIEUCHUNG - Báo cáo khoa học: "Ribosomal DNA and chloroplast DNA polymorphisms in a mixed stand of Quercus robur and Q petraea"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Ribosomal DNA and chloroplast DNA polymorphisms in a mixed stand of Quercus robur and Q petraea. | Ann Sci For 1993 50 Suppl 1 41S-47S Elsevier INRA 41s Original article Ribosomal DNA and chloroplast DNA polymorphisms in a mixed stand of Quercus robur and Qpetraea RJ Petit1 2 DB Wagner 2 A Kremer1 INRA laboratoire de génétique et d amelioration des arbres forestiers BP 45 33611 Gazinet Cedex France 2 Department of Forestry University of Kentucky Lexington KY 40546-0073 USA Summary More than 70 trees belonging to the morphologically distinguishable species Quercus robur L and Quercus petraea Matt Liebl were sampled in a mixed stand located in western France. The ribosomal DNA repeat was characterized by a high level of length polymorphism while chloroplast DNA in our sample was nearly fixed at 2 previously identified polymorphic regions. Overall very little differentiation was found between species using both markers. The implications for our understanding of this complex of species are discussed. Quercus petraea Quercus robur gene flow diversity sympatry Resume Polymorphisme de runite ribosomique et de I ADN chloroplastique dans une fu-taie mixte de chênes pédonculé et sessile. Plus de 70 chênes des 2 espèces Quercus robur L et Q petraea Matt Liebl ont été échantillonnés dans une parcelle de regeneration située dans I ouest de la France. Nous avons étudié le polymorphisme de longueur de I unite ribosomique ainsi que le polymorphlsme de I ADN chloroplastique. La region codant pour les gènes ribosomiques est très variable. Au contraire les 2 regions de I ADN chloroplastique étudiées sont pratiquement mono-morphes. La differentiation interspecifique pour ces deux marqueurs est négligeable. Les implications de ces résultats pour notre comprehension de ce complexe d especes sont discutées. Quercus petraea Quercus robur flux de genes diversite sympatrique . 42s RJ Petit et al INTRODUCTION Molecular markers have already provided biologists with an impressive amount of taxonomic data. However recent studies of chloroplast DNA cpDNA variation in plants indicate that some

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