杨树抗云斑天牛新品种选育材性性状遗传分析

POPLAR BREEDING OF RESISTANCE TO BATOCERA HORSFIELDI (HOPE) GENETIC ANALYSIS OF WOOD QUALITY CHARACTERISTICS

格性直接影响木材的用途及其经济价值。材性育种已成为现代林木育种的一个重要内容。世界各国都非常重视。木材密度和纤维长度是主要的两个材性特征,往往是林木材性改良的两个性状。木材密度直接影响木材物理力学性质,木材纤维长度和长宽比直接影响纸浆和纸的质量。研究木材密度和木材纤维特性的遗传变异规律,有助于指导林木材性育种工作。本文报道I-69杨×I-63杨F1杂种无性系木材性状遗传变异的研究结果。

This paper studies the genetic variation of wood qualitios among I-69 (Populus deltoides Bartr. cl. 'Lux' (I-69/55) )and 14 clones of Hybridization combination No. 34-I-69×I-63 (P. deltoides Bartr. cl. 'Harvard' (I-63/51)) . Increment cores with diameter of 0.5cm, from eastern direction at DBH, were collected from one single tree for each of 15 clones from each of three blocks.The Results showed that the difference of specific gravity among clones was signicant at 5% of probadility level. The specific gravity of I-69 is significantly higher than that of any clone in combination No.34.However,no significant difference was found among 15 clones for fiber length, fiber width and fiber length/width ratio. The estimated value of broad-sesnse heritability (h^2) for specific gravity, fiber length, fiber width and fiber length/width ratio, were 0.7, 0.12, 0.33 and 0.15, respectively. In addition, no significant correlation was found between the growth traits and wood qualitios. It is possible for some fast-growing clones to have good wood qualitios.