tailieunhanh - Báo cáo lâm nghiệp: "The reproductive success of a Quercus petraea × Q. robur F1-hybrid in back-crossing situations"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: The reproductive success of a Quercus petraea × Q. robur F1-hybrid in back-crossing situations. | Ann. For. Sci. 64 2007 37-45 INRA EDP Sciences 2007 DOI forest 2006086 37 Original article The reproductive success of a Quercus petraea X Q. robur Fl-hybrid in back-crossing situations Ditte C. Olrik Erik D. KJAER The Danish Centre for Forest Landscape and Planning The Royal Veterinary and Agricultural University Hoersholm Kongevej 11 2970 Hoersholm Denmark Received 27 November 2005 accepted 28 September 2006 Abstract - A 56 year old Quercus petraea X Q. robur F1-hybrid was back-crossed to both parental species. Pollen mixes were applied and paternity assigned to offspring based on microsatellite markers. The studied Q. petraea X Q. robur hybrid proved highly fertile and back-crossed well with both Q. robur and Q. petraea with slight but not significant preference for Q. robur The results do not support the hypothesis about highly unidirectional gene flow between Q. robur and Q. petraea towards Q. robur as the observed back-crossing ability of the hybrid opens a route for nuclear gene flow from Q. robur to Q. petraea. However Q. petraea X Q. robur hybrids may be rare in nature and the results do not tell us if the probably more common reciprocal hybrid also back-crosses easily to Q. petraea. Quercus robur Q. petraea pollen fertility reproductive success introgression Résumé - Succès reproductif d un hybride Quercus petraea X Q. robur en rétro-croisements. Un hybride de première génération de Quercus petraea X Q. robur âgé de 56 ans a été rétro-croisé avec chacune des deux espèces parentales. Un mélange pollinique a été appliqué et la paternité de la descendance a été déterminée grâce à des marqueurs micro-satellites. L hybride étudié s est révélé très fertile et se croise bien à la fois avec Q. robur et Q. petraea mais légèrement mieux quoique de manière non significative avec Nos résultats ne confirment donc pas l hypothèse d un flux génique unidirectionnel marqué entre Q. robur et Q. petraea en faveur de Q. robur. En effet la faculté de .