TAILIEUCHUNG - Báo cáo khoa học: " Variation in the position of resin canals in the needles of Abies species and provenances"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Variation in the position of resin canals in the needles of Abies species and provenances. | 253 Ann Sci For 1992 49 253-260 Elsevier INRA Original article Variation in the position of resin canals in the needles of Abies species and provenances KP Panetsos University of Thessaloniki Laboratory of Forest Genetics and Plant Breeding 54006 Thessaloniki Greece Received 14 December 1991 accepted 11 February 1992 Summary The position of resin canals in the needles of Abies species hybrids and provenances were studied by sampling 21-year-old plants in a species and provenance field experiment. It was found that at an early age all species and provenances develop needles with marginal resin canals. However in the hybrids and also in some species and provenances 2 types of adult tree were distinguished a trees with marginal resin canals throughout the crown and b trees with marginal resin canals in the lower part of the crown followed by a transitional zone where all stages are manifested finally the position becomes median in the needles in the rest of their crown. The frequency of the 2 types of tree varies between species and hybrids and also among provenances within species. The position of the resin canals and the variation detected is discussed with regard to its origin and its significance to the taxonomy and evolution of the genus Abies. Abies spp fir resin canal position variation I evolution Resume Variation de la position des canaux resiniferes des aiguilles des espèces et provenances de sapin abies. La position des canaux resiniferes au sein des aiguilles des espèces provenances et hybrides de sapin abies a été étudiée en échantnionnant des indlvidus âgés de 21 ans dans un dispositif experimental de comparaison d especes et de provenances. On a observe que les canaux resiniferes étaient marginaux dans toutes les espèces et provenances au cours des premiers stades de leur développement. Toutefois Chez les hydrides ainsi que Chez certaines especes et provenances 2 types d arbres âgés peuvent être dlstingués a arbres avec canaux resiniferes marginaux tout

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