Diversity and cluster analysis of tomato germplasm resources

ZHANG Jing; BAI Rui; JIA Ying; WEN Shida; LANG Xiaoping; XU Xiaoyong

doi:10.3969/j.issn.1673-2871.2018.02.003

Abstract：In order to assess the genetic diversity and relationship of tomato germplasm resources,32 tomato germplasms were used as materials,22 morphological traits such as hypocotyl color,plant height,leaf type,date of initial blooming,the flower number of single flower inflorescence,fruit shape,mature fruit color and the shape of fruit transverse section were observed in this study.On this basis,the clustering analysis was done.The results showed that there were different extend of diversity on the different tomato germplasms.All the variation coefficients of fruit shape,hairs on the stem leaf,the flower number of single flower inflorescence,the fruit number of single flower inflorescence and fruit cracking were more than 40％.In addition,the variation coefficients of some morphological traits were very low such as the inflorescence types,the leaf type,the leaf shapes and so on.In particular,there is no variation in hypocotyl color.According to the clustering analysis,the 32 tomato germplasms can be divided into 6 groups.Group Ⅰ included 24 materials and had large or medium fruits.Group Ⅱ included 2 materials and had saffron small fruits.Group Ⅲ included 1 material with long pear-shaped small fruits.Group Ⅳ included 3 materials with the bifid inflorescence and small fruits.Group Ⅴ included 1 material with the irregular shape large fruits.Group Ⅵ included 1 material with the high plant,ordinary leaf,pinnately compound leaf and small fruits.Thus it suggested that there are distinct genetic diversity in the tomato germplasms,which provide plenty substance basic for choosing the new tomato variety.