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

In this study,phenotypic diversity and classification of 212 aceessions 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.