TAILIEUCHUNG - Báo cáo lâm nghiệp: "of morphological characters and molecular markers for the analysis of hybridization in 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:of morphological characters and molecular markers for the analysis of hybridization in sessile and pedunculate oak. | Ann Sci For 1996 53 79-91 Elsevier INRA 79 Original article Comparison of morphological characters and molecular markers for the analysis of hybridization in sessile and pedunculate oak R Bacilieri A Ducousso A Kremer Laboratoire de génétique et d amelioration des arbres forestiers INRA BP 45 33611 Cestas-Gazinet France Received 20 October 1994 accepted 29 August 1995 Summary Interspecific hybridization is common in many plant groups but the morphology of hybrids has rarely been studied on an experimental basis. The sessile and the pedunculate oak are closely related species which can hybridize in nature. Yet the morphology of their hybrids is still a matter of conjecture. Here we studied the morphology and the hybridization rate in several open-pollinated progenies collected in a mixed stand of sessile and pedunculate oak. For both species two types of pollinating environments intraspecific and interspecific were compared for their morphological and genetic effects in progenies. The analysis of the molecular markers showed that the contribution of sessile oak to the progenies of pedunculate oak was positive. The genetic effect of the pollinating environment was significant. The morphological characters gave a better image of interspecific gene flow when considered together in multivariate analyses rather than in univariate analyses. This probably occurred because the hybrids were a mosaic of parental and intermediate characters rather than exactly intermediate forms. morphology RAPD hybridization Quercus Resume Comparaison des caractères morphologiques et des marqueurs moléculaires pour analyse de I hybridation entre les chẽnes sessile et pédonculé. L hybridation interspecifique est un phénomène courant Chez de nombreux groupes vốgétaux mats la morphologie des hybrides a été rarement étudiée sur des bases experimentales. Les chêne sessile et pédonculé sont deux espèces étroitement apparentées qui peuvent naturellement s hybrider. Toutetois la morphologie de leurs

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