Abstract: Correlation between indica japonica classification index and morphological character of 20 cultivars of Yunnan nuda rice, two wide compatible cultivars (02428, and Dular) and four indica japonica tested cultivars were studied by using Cheng’s and Yu’s classification methods. The results indicated that 20 Yunnan nuda rices have 13 varieties and 69 forms, japonicaclinous rice have higher proportion in tested cultivars, and have good wide compatibility. There are significant correlation coefficients in Cheng’s indica japonica rice classification index and other characters especially anther length, internode length and plant height. It is suggested that differentiation of indica japonica rice of the primitive Yunnan nuda rice depended on temperature, and it was correlated with latitude and elevation.

Key words: Yunnan nuda rice, classification, variety classification, correlations

摘要： 以程氏籼粳分类和俞履圻的变种变型分法对20份云南光壳稻品种及籼粳测验种02428、Dular进行籼粳亚种、变种变型分类，并对其形态性状进行相关分析。结果表明，20份云南光壳稻包括13个变种69个变型，以偏粳型品种占较高比例，籼粳分类品种中偏粳型品种的广亲和性较好。籼粳分类性状间及其与其他形态性状尤其是花药长度、穗下节长和株高存在极显著的相关性，推断原始的云南光壳稻的籼粳分化取决于温度，并与纬度和海拔密切相关。

关键词: 云南光壳稻, 籼粳分类, 变种分类