黑木相思优良无性系叶片数量性状与生长评价

Leaf Quantitative Traits and Growth Evaluation in Acacia melanoxylon Excellent Clones

摘要:

为合理利用种质资源，对5年生黑木相思（Acacia melanoxylon）无性系试验林中9个优良无性系（F1、SR3、SR9、SR14、SR17、SR18、SR25、SR38、SR41）开展叶片和生长性状的遗传变异研究，采用模糊数学隶属函数值法进行综合评价。结果表明，9个无性系叶片在形态、结构、化学性状都存在显著差异，以形态性状变异系数最大，其中叶面积（LA）和叶宽（LW）可作为直观区别无性系的可靠指标。SR18、SR17和SR14号无性系的树高（H）和胸径（DBH）生长具有显著优势。相关性分析表明，LW与H，LW、LA、比叶面积（SLA）与DBH呈显著线性关系，而叶长（LL）、干物质量（LDMC）、C、N、P、C/N和N/P与H和DBH相关性弱。隶属函数综合评价排名前4位的是SR17、SR18、SR41、SR14，可作为直接生产和后续育种工作的有效资源加以应用。

Abstract:

In order to rational utilization the germplasm resources, the genetic variation of leaf and growth traits in nine excellent clones, including F1, SR3, SR9, SR14, SR17, SR18, SR25, SR38, SR41, in 5-year-old Acacia melanoxylon forest were studied. The results showed that the leaf morphology, structure and chemical traits exhibited significant differences among the clones, in which the variation coefficient of leaf morphological traits was the highest, and the leaf width (LW) and leaf area (LA) could be used as reliable indexes to intuitively distinguish clones of A. melanoxylon. The height (H) and diameter at breast height (DBH) in clones of SR18, SR17 and SR14 had significant advantage. The correlation analysis showed that LW had significant linear relationship with H and DBH, and did also between LA, specific leaf area (SLA) with DBH. However, the other traits, leaf length (LL), leaf dry matter content (LDMC), contents of carbon (C), nitrogen (N), phosphorus (P) in leaf, C/N and N/P, had weak correlation with H and DBH. The top four clones (SR17, SR18, SR41, SR14) were selected by comprehensive evaluation of membership function, which could be directly used for production and breeding as excellent germplasms in future.