Genetic diversity analysis of 65 rice cultivars by using yield related traits

In order to reveal the genetic diversity of 65 hybrid rice cultivars from germplasm bank, using statistical method, genetic diversity index and correlation index of yield related characters were obtained. According to yield related characters, there existed abundant genetic diversities, the genetic diversity indexes ranged from 1.607 to 2.000. The yield per plant was significantly positive correlated with panicle number per plant, grain number per panicle and total number grains, the correlation coefficients were 0.346, 0.586 and 0.508, respectively. Clustering analysis indicated that germplasm resources had a high degree of differentiation, 65 rice cultivars were clustered to 22 subpopulations. Three principal components was extracted by PCA, including spikelet number, seed setting rate and panicle number. Their accumulative contribution rate was 85.212%, which can be used as comprehensive evaluation for all cultivars. According to order each principal component score and comprehensive score, top five of 65 cultivars included Aoyezhan6, R995, Youzhan8, Simiao12 and R998. As a result, germplasm resources of abundant genetic diversity should be concerned, and larger differences of genetic distance and comprehensive performance between parents should be selected in rice breeding.