Genetic Diversity Study of Phenotypic Traits of 73 Rice Varieties by Approved in Jinlin Province
In order to understand the phenotypic trait diversity level of rice varieties in Jilin province,39 phenotypic traits of 73 rice varieties approved in Jilin province in recent years were analyzed by means of variation coefficient,genetic diversity index(H')and cluster analysis.The results showed that,the growth habits of rice varieties approved in Jilin province in recent years were mainly semi-erect,the angle of last second leaf and flag leaf was mostly upright to semi-erect,the exsertion of panicle was well and it's angle was slightly bent,the type of secondary branches was few;broadly ovate grain,light yellow glume,oval brown rice.Most varieties were sensitive to panicle blast,moderate sensitive leaf blast at seedling stage,moderate resistant to leaf blast,moderate sensitive to sheath wilt and moderate resistant to white leaf blight.The variation coefficient(CV)of brown rice rate was the smallest,and that of chalkiness was the greatest.The H'of plant height was the largest,and that of length and width ratio of brown rice was the smallest.They were inconsistent in H'and CV.Among the 23 quantitative traits,74 correlation coefficients reached significant or extremely significant levels,among which panicle length and grain length were significantly positively or negatively correlated with many traits.Brown rice length,brown rice ratio of length-width and 1000-grain weight were significantly positively correlated with each other;and brown rice rate,milled rice rate and whole milled rice rate were significantly positively correlated with each other.Through cluster analysis,73 rice varieties were divided into four groups.Group Ⅰ represented tall culm,large panicle and long grain varieties.Group Ⅱ represented the varieties with strong stem,strong tillering ability and good stable yield.Group Ⅲ represented the varieties with high yield but ordinary rice appearance quality.Group Ⅳ accounted for 50.7％,representing the ordinary yield,small panicle but good rice appearance quality of rice varieties.The results of principal component analysis indicated that the nine principal components had a cumulative contribution rate of 79.170％.The yield traits were associated with the first two principal components,which had a cumulative contribution rate of 33.870％.
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