美洲黑杨无性系的苗期生长比较

Comparison of seedling growth among Populus deltoides clones

从美国田纳西州、路易斯安那州引进599个无性系,通过3年苗期试验,对苗期生长表现较好的13个无性系进行生长量测定,结果表明:一根一干苗各无性系之间地径生长存在显著性差异,二根一干苗和三根一干苗各无性系之间地径生长存在着极显著性差异;苗高生长在各无性系之间均存在着极显著性差异;参试无性系的地径、苗高表型变异系数分别为12.638%和5.570%,广义遗传力分别为0.835和0.860,遗传变异系数分别为11.562%和5.150%。说明各性状遗传潜力较大,存在着广泛的遗传变异,具有获得较大遗传增益选择的潜力。

Seedling test with 599 Populus deltoides clones introduced from Tennessee and Louisiana of United States was carried out for 3 years to measure growth increment of 13 clones with good growth performance.The results showed that as follows： There was obvious significant difference in ground diameter growth among clones with single root and stem.There was extremely significant difference in ground diameter growth among clones with two roots single stem and among clones with three roots single stem.There was extremely significant difference in seedling height growth among clones.Phenotypic variation coefficient of ground diameter and seedling height of tested clones were 12.638% and 5.570% respectively,broad-sense heritability were 0.835 and 0.860 respectively,and genetic variation coefficient were 11.562% and 5.150% respectively.The results demonstrated that there were great genetic potential and broad genetic variation of traits in tested clones.Thus,tested clones were elite materials with good potential of large genetic gain.