聚类分析在水稻抗旱材料分类中的应用

选取102份不同质源的水稻材料,通过水、旱对比试验,以有效穗、穗粒数、千粒重、株高及单株粒重为指标进行聚类分析。结果表明,参试材料可分为5类,其中第Ⅴ类材料Dc平均值为84.88,表现出较强的抗旱性,可用作抗旱亲本材料使用;其次为第Ⅱ类材料,Dc平均值达75.64,当中个别材料的个别性状表现优良,可作为特殊材料使用;最差的是第Ⅳ类,Dc平均值为45.9,表现为不抗旱;第Ⅰ、Ⅲ类材料抗旱性能表现一般。

Classification of Rice Materials for Drought Resistance by Cluster Analysis

Under drought treatment conditions,102 shares of different rice（Oryza sativa） varieties were clustered using the agronomic traits including productive ears,grains per ear,1 000-grain weight,plant height and grain weight per plant as indicators.The results showed that the materials tested could be classified into 5 groups.Of the five groups,group Ⅴ showed highest drought resistance（mean Dc value reached 84.88）,and could therefore be used as parent materials for drought cultivar breeding;groupⅡexhibited a mean Dc value of 75.64,among these materials some individuals performed excellent traits and could be used as special materials;group Ⅳ showed the lowest mean Dc value（45.9）,indicating no drought resistance;groupⅠand group Ⅲ performed as ordinary.