黑木相思14个无性系叶片性状变异分析

Analysis of Variation of Leaf Traits in Acacia melanoxylon Fourteen Preferred Clones

在6年生黑木相思(Acacia melanoxylon)无性系试验林中,对14个无性系的叶长、叶宽、叶面积、叶柄长、叶厚、比叶面积及叶干物质量共7项叶片性状进行了测定和变异分析。结果表明:叶面积和叶柄长变异系数较大,叶干物质量的变异系数较小,且叶片性状的变异主要为无性系之间的变异;黑木相思无性系叶片性状之间存在相关性,叶长、叶柄长和叶宽与叶面积呈极显著正相关,而叶面积、比叶面积与干物质量呈极显著负相关,叶厚与比叶面积呈极显著负相关;主成分分析表明,除叶柄长外,其它6个叶片性状都是鉴定无性系的重要特征指标。聚类结果显示,14个无性系聚为4类,F1、SR38、SR41被单独聚类,其它11个无性系聚为1大类,说明大部分无性系叶片性状变异不显著。

The genetic variation of leaf traits including leaf length,leaf width,leaf area,petiole length,thickness of blade,specific leaf area and leaf dry matter content of 14 superior clones in 6-year-old Acacia melanoxylon trial were studied and analyzed.The results showed that the leaf traits exhibited significant differences among A.melanoxylon clones,in which the variation coefficient of the leaf width and leaf area was higher,and that of leaf dry matter content was relative low.It was also found that different leaf traits existed correlation.For example,leaf length,petiole length and leaf width had significant positive correlation with leaf area,while leaf area and specific leaf area showed significant negative correlation with leaf dry matter content,and specific leaf area showed significant negative correlation with thickness of blade.Besides,all the other six leaf traits except for petiole length could be important indicators for identifying these A.melanoxylon clones by principal component analysis.All clones were clustered for four groups,which F1,SR38 and SR41 were cluster one individual group,respectively,and the rest 11 clones were clustered for one main group.The results of clustering analysis suggested that the leaf trait of most of the clones did not vary significantly.