tailieunhanh - Báo cáo khoa học: "Hybridization and mating system in a mixed stand of sessile and pedunculate oak"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Hybridization and mating system in a mixed stand of sessile and pedunculate oak. | 122s Ann Sá For 1993 50 Suppl 1 122s-127s Elsevier INRA Original article Hybridization and mating system in a mixed stand of sessile and pedunculate oak R Bacilieri 1 2 G Roussel 1 A Ducousso 1 1 Station de recherche forestiere de Bordeaux INBA Pierroton BP 45 33611 Gazinet France 2 Istituto di Selvicoltura Facolta di Agraria Via San Bonaventura 13 50145 Florence Italy Summary Patterns of hybridization and of the mating system of Quercus petraea and Quercus roburhave been inferred from examination of allozyme variation in 2 cohorts adults and progeny of a stand comprised of both species. Differences in allelic frequencies were found in each species between the pollen pool and the adult trees but the pattern of hybridization was apparently asymmetrical. Q petraea and Q robur are almost exclusively allogamic the multilocus outcrossing rate being for both species. allozymes hybridization I mating system pollen pool Quercus robur Quercus petraea Resume Hybridation et système de reproduction dans une torêt mixte de chêne sessile et chêne pédonculé. Les modalités d hybridation et du système de reproduction de Quercus petraea ef Quercus robur ont été étudiées à partir des variations allozymiques dans 2 cohortes les adultes et leurs descendants d une foret mixte composee des 2 espèces. Pour chaque espèce des differences dans les frequences alléliques entre le pool pollinique et les arbres adultes ont été trouvées mais le sens de I hybridation semble asymétrique. Q petraea eta robur sent presque exclusivement allogames le taux d allofecondation multiloci étant de 0 96 pour chacune des 2 espèces. allozymes hybridation système de reproduction poolpollinique Quercus robur Quercus petraea Hybridization and mating system in oaks 123s INTRODUCTION MATERIALS AND METHODS Quercus petraea Matt Liebl and Ouercus robur L have a largely sympatric distribution in Europe and it is suspected that they hybridize in nature. The species are anemophilous a survey of phenology in the same