tailieunhanh - Báo cáo lâm nghiệp:"Genetic correlations between wood density components in Pinus pinaster Ait."

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Genetic correlations between wood density components in Pinus pinaster Ait." | Ann. For. Sci. 60 2003 285-294 INRA EDP Sciences 2003 DOI forest 2003020 285 Original article Genetic correlations between wood density components in Pinus pinaster Ait. José Luis . Louzada ICETA UTAD Univ. Trás-os-Montes e Alto Douro Dep. Florestal 5000-911 Vila Real Portugal Received 12 September 2001 accepted 3 June 2002 Abstract - The main purpose of this work was the determination of the genetic correlations among the density components of Pinus pinaster. The material was collected from 180 trees by the extraction of an increment core from pith to the cambium at breast height in a open pollinated test with 15 families at 18 years growth. The wood density components were measured using the X-ray densitometry technique. Although initially the density components of all rings were defined in this study it was only analysed rings with a 6 10 and 13 cambial age. The Average Ring Density is more dependent on the Earlywood components mainly on Earlywood Density than Latewood ones. Among all the components analysed Earlywood ones revealed the highest and most stable genetic control without revealing any adverse genetic correlation with regard to other components. Therefore these are the most suitable ones to be included in future selection and improvement programmes. Even though the correlation coefficients are low Ring With is positively correlated at genetic and phenotypic level with Average Ring Density Minimum Density Earlywood Density and Latewood Percentage. tree breeding genetic correlations wood quality wood density components Pinus pinaster Résumé - Corrélations génétiques entre les composantes de la densité du bois de Pinus pinaster Ait. L objectif principal de ce travail consistait à calculer les correlations génétiques entre les composantes de la densité pour le bois de Pinus pinaster. Le matériel a été obtenu de 180 arbres à partir desquels il a été extrait une carotte de sondage de la moelle à l écorce à hauteur de poitrine. Les arbres .

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