Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: The heritability of wood density components in Pinus pinaster Ait. and the implications for tree breeding. | Ann. For. Sci. 59 2002 867-873 INRA EDP Sciences 2002 DOI forest 2002085 867 Original article The heritability of wood density components in Pinus pinaster Ait. and the implications for tree breeding José Luis P. C. Louzada and Fortunato M. A. Fonseca ICETA UTAD Universidade Trás-os-Montes e Alto Douro Dep. Florestal 5000-911 Vila Real Portugal Received 28 March 2001 accepted 17 September 2001 Abstract - The main objective of this work was to evaluate the genetic control of Pinus pinaster wood quality by estimating the heritability of wood density components and its age evolution. The material was collected from 180 trees by the extraction of an increment core in a progeny test at 18 years old. The wood density components were measured using the X-ray densitometry technique. The highest and most stable age heri-tability values were obtained by the earlywood components minimum density and earlywood density followed by the average ring density. The latewood percentage ring width and heterogeneity revealed middle values while the latewood components maximum density and latewood density always presented the lowest and most unstable heritability values. Thus it was concluded that amongst all components the earlywood density mostly depends on genetic effects and could be used in future selection and tree breeding programs to improve wood quality. The inclusion of the latewood components in the selection criterion will not give any significant genetic advantage. tree breeding heritability wood quality wood density components Pinus pinaster Résumé - Héritabilité des composantes de la densité du bois chez Pinus pinaster Ait. et implications pour l amélioration génétique. L objectif principal de ce travail étaitl étude du contrôle génétique de la qualité du bois du Pinuspinaster Ait. grace al estimation de l heritabi-lité des composantes de la densité et de son évolution avec l age. Des carottes de sondage ont été extraites de 180 arbres appartenant à un test de .
