摘要
为了探索美洲黑杨物候性状遗传变异水平与利用潜力,开展基因资源评价,提供杨树定向遗传改良育种材料,对60个引种美洲黑杨无性系苗期的8个物候期进行观测分析。结果表明:①各无性系物候特征存在较大差异,展叶盛期差异最大,变异系数为14.97%,最小的是落叶末期,为3.83%;②展叶盛期出现的时间最分散,落叶末期相对集中,苗木生长前期物候特征是影响生长期长短的主要因素;③通过主成分分析将物候期分为3类典型,即萌芽期、展叶盛期和落叶期;④对各无性系物候出现时间变量进行聚类分析,将60个无性系分成4类。
In order to provide directionally genetically improved breeding materials of poplar by exploring the phenological traits genetic variation level and its develop- ment potential of Populus deltoides and the resource evaluation was carried out; 8 phenological phases in seedling period were observed and analyzed of 60 Populus deltoids clones introduced from America. The results showed that: (1) there was obvious difference in phonological character among clones, especially in leaf-spread- ing peak stage and the end term of leaf-falling stage, with the largest variation co- efficient of 14.97% and the minimum of 3.83% respectively. (2) Leaf-spreading peak stage scattered but the end term of leaf-falling stage concentrated the most. The phonological character in early stage of seedling growth was the main factor influ- encing the length of growing season. (3) By principal component analysis, pheno- logical phases were classified into 3 typical periods, including germination stage, leaf-spreading peak stage and leaf-falling stage. (4) Totaling 60 clones were classi- fied into 4 types by using clustering analysis in phenological time variables of clones.
基金
Supported by National Special Funds for Forest Research in the Public Interest(201004004)~~
关键词
美洲黑杨
无性系
物候期
主成分分析
聚类分析
Populus deltoids
Clone
Phenological phase
Principal component analysis
Clustering analysis