美洲黑杨与不同种源青杨杂种苗叶片和生长性状多水平变异研究

利用美洲黑杨 5 0号为母本和青杨 5个种源 (各 10个单株 )为父本杂交 ,获得杂种F1代无性系 ,对此多水平杂交育种体系叶片和生长遗传变异进行了研究。结果表明 ,父本青杨种源间及种源内单株间均达到极显著差异 ,F1代无性系的种源间、种源内家系间和家系内无性系间存在不同差异。杂种F1代无性系扦插苗父本种源不同的杂交组合间和组合内家系间成活率差异不显著 ,1、2、3年生苗的生长性状在不同层次变异水平上差异显著或极显著 ,表明父本青杨种源间和种源内变异对F1代生长有显著影响 ,F1代无性系存在丰富的遗传变异 ,具有选择潜力。杂种F1代叶片形态与苗期生长性状间未发现有较大相关性

Multi-level Genetic Variation in Leaf and Growth of Hybrid System between Populus deltoides and P. cathayana

The controlled hybridization between a female Populus deltoides Marsh,`55/65' and 5 provenance (10 individuals each provenance) of the male P. cathayana Rehd. produced the hybridization system with multi level variations for breeding. The 7 leaf traits, including leaf length, leaf width, ratio of leaf length to width, petiole length, ratio of petiole length to main vein, angle between main and the second leaf vein, leaf base of the parents and F 1 hybrid were analysized. The analysis of variance showed that significant difference of leaf traits existed among provenances and among individuals within provenances of P. cathayana. Several leaf traits of F 1 hybrid also showed significant difference among provenances, among families within provenances and among clones within families. Comparison between leaf traits of parent and those of F 1 hybrid suggested that the male parent has more effects on leaf traits of F 1 hybrid than of female parent. No significant difference of plant surviving existed among F 1 clones. The significant difference of 1,2,3 year old growth among F 1 clones showed that the variation of male parents brought notable effect on growth of F 1 clones. Correlation between leaf and growth of F 1 clones was not significant. These results of analysis will provide more base information about multiple level variations on such traits as growth and wood properties for poplar breeding in future.