Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Genetic variation and genotype by environment interactions of juvenile wood chemical properties in Pinus taeda L. | Ann. For. Sci. 63 2006 897-904 INRA EDP Sciences 2006 DOI forest 2006073 897 Original article Genetic variation and genotype by environment interactions of juvenile wood chemical properties in Pinus taeda L. Robert SYKESa Bailian Lla Fikret ISIKa John KADLAb . CHANGc a Department of Forestry and Environmental Resources North Carolina State University College of Natural Resources Raleigh NC 27695-8002 USA b Forest Sciences Centre University of British Columbia Vancouver BC V6T 1Z4 Canada c Department of Wood and Paper Science North Carolina State University Raleigh NC 27695-8005 USA Received 31 October 2005 accepted 13 February 2006 Abstract - Genetic variation and genotype by environment interaction GxE were studied in several juvenile wood traits of 11 year-old loblolly pine trees Pinus taeda L. . Wafer thin 200 pm samples from juvenile ring 3 and transition ring 8 wood of 12 mm increment cores were analyzed. Transition wood had higher a-cellulose content longer fiber mm and higher coarseness but lower lignin than juvenile wood cellulose fiber length mm coarseness and lignin . General combining ability variance for the traits explained 2 to 10 of the total variance whereas the specific combining ability variance was negligible except for a-cellulose content in transition wood 2 . Specific combining ability by site interaction variance explained from 5 fiber length to 37 lignin of the total variance. Weak individual-tree heritabilities were found for all the traits except coarseness which was moderately high in both juvenile and transition wood . Full-sib and half-sib family heritabilities of traits ranged to . Genetic correlations of wood quality traits with volume and stem straightness were weak while favorable genetic correlations of lignin with cellulose coarseness and fiber length were observed. Implications on forest tree improvement programs were discussed. heritability genetic correlation
