10个杨树杂种组合木材密度与纤维遗传变异研究

Study on the Genetic Variance of Wood Basic Density and Fiber Properties of Poplar Hybrids

对保定5年生杨树无性系测定林和7年生育种资源保存林10个杂交无性系木材密度,纤维长、宽度分析结果表明:①不同杂种组合、个体间的木材密度、纤维长度均有很大变异。木材密度与速生特性之间呈微弱的负相关;纤维长度与生长性状相关不显著。②木材密度和纤维长度可以独立选择,从而选出密度较高,纤维较长和速生优质的杨树杂交新个体。③幼龄与中、成龄的木材密度相关显著,从而说明了在杨树材性育种中早期选择的可行性。研究证明,对华北地区来说,69杨为母本,欧亚黑杨及其种内杂种为父本是选育速生优质杨树新品种的优良组合。

The test material used in the study was the poplars planted in Baoding, Heibei Province, whose wood basic density, fiber length and width were analysed. The result reveals that: (1) there are obvious differences between the wood basic density and fiber length of different hybrid combinations and individuals. The differences between wood basic density and growth property is not significant; (2) the two properties can be selected separately, therefore the new poplar hybrids which has high wood basic density, long fiber length and fast-growth can be selected. (3) the relationship of wood basic density between juvenile and adult wood is significant, so the early selection can be adopted in poplar breeding. The crossing, which P. deltoides cv. 'Lux' was used as mother plant and P. mgra the father plant and inter species hybrids, was the best combination for selecting fast-growing and good quality poplar in the North China area.