基于表型性状的中国大蒜资源遗传多样性分析

Evaluation on Genetic Diversity of Garlic( Allium sativum L. ) Clones in China Based on Morphological Characters

对资源圃保存的212份大蒜种质资源的表型性状进行了系统鉴定,分析表明我国大蒜种质资源的表型变异丰富。主成分分析表明,29个性状可以归并为反映植株生长发育、产品特征和产量构成的8个主成分;进一步的聚类分析将所有资源分为特点明显的2类5亚类。为了避免质量性状在种质评价中的主导作用,与产量相关的鳞茎数量性状的主成分分析显示,前3个主成分累积贡献率达74.83%,第一主成分中鳞茎重、鳞茎直径、鳞茎高和鳞芽数是影响产量的主要因子。主坐标排序将所有资源分为6类。通过综合评价,将大蒜鳞茎产量分为6个级别,筛选出单产大于15 t/hm2的资源3份。

In this study,phenotypic diversity and classification of 212 accessions of garlic germplasm in China were studied based on morphological traits by methods of clustering, principal component analysis, and correlation analysis. The results of principle component analysis indicated that 8 component factors could represent 29 characters related with plant growth and development,germplasm characters,and yield composition. The cluster results showed that all the resource could be divided into 2 groups and 5 sub-groups. To avoid the overrating effect from qualitative traits, principal component analysis of quantitative traits related to bulb yield showed that the cumulative contribution proportion of the first three components including bulb weight, diameter, weight and clove number was up to 74.83% and could be the most important traits affecting bulb yield. All accessions of garlic germplasm were divided into 6 groups according to yield and the analysis of principal coordinates. Moreover,three accessions yielded above 15 t/hm2 were selected out.