tailieunhanh - Báo cáo khao học: "Genetic parameters for spiral-grain angle in two 19-year-old clonal Norway spruce trials"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Genetic parameters for spiral-grain angle in two 19-year-old clonal Norway spruce trials. | Ann. For. Sci. 59 2002 551-556 INRA EDP Sciences 2002 DOI forest 2002040 551 Original article Genetic parameters for spiral-grain angle in two 19-year-old clonal Norway spruce trials T 1 tr o Tì T 11 f a ĩl n o inl fZ-T O Rn iZH b R i Of l 0 0 Aĩì c T T1 f 1 z h iZH d QJ o Gl TÌ 1 1 z 0 TÌ iZH b Bjorn naiunup Michael Glabnei DO Karlsson Ulrich MUliei Sabine Rosner Lars Wilhelmssona and Rupert Wimmerb aSkogForsk Science Park 751 83 Uppsala Sweden b Institute of Botany Universitat fur Bodenkultur Wien Gregor Mendelstrasse 33 1180 Vienna Austria c SkogForsk Ekebo 268 90 Svalov Sweden d Institute of Wood Science and Technology Universitat fur Bodenkultur Wien Gregor Mendelstrasse 33 1180 Vienna Austria Received 16 August 2001 accepted 17 June 2002 Abstract - Spiral grain was measured for all annual rings on wood discs taken at a single sampling height from two 19-year-old field age Norway spruce Picea abies L. Karst. clonal trials. In both trials the mean grain angle reached a maximum inclination to the left at ring number 4 followed by a monotonic decrease towards a right-handed inclination. Clonal means of mean grain angle of rings 3 to 15 ranged from to degrees and from to degrees in the two trials respectively. The broad-sense heritability of mean grain angle was in both trials and the slope of the radial grain-angle development showed heritabilities varying between and . Estimates of genotypic correlations indicated that clones with a high grain angle in the inner rings tended to have a more rapid development towards a straight angle in the following rings. Selection based on any of the rings in the interval from ring numbers 5 to 10 was most efficient in decreasing the average grain spirality at the sampling level considered. spiral grain heritability genotypic correlation correlated response Résumé - Paramètres génétiques de l angle du fil du bois dans 2 tests clonaux d Epicea commun âgés de 19 ans. L angle du fil du bois a