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用程－王分类体系对云南收集保存的地方稻种资源进行系统分类和遗传变异研究表明：（１）云 南是中国稻种最大的遗传多样化中心和优异种质的富集地区及其天然宝库，受中国与南亚两个稻种独 立起源中心的强烈影响，因而形成了云南尤其是滇西南稻种资源类型的多样性举世瞩目。（２）云南地 方稻种分为籼粳２个亚种及其６大生态群，其中热带粳稻、光壳粳群和普通粳群分别占云南地方稻种 的３．６％、１８．１％３２．１％；早中籼群、晚籼群和冬籼群分别占云南地方稻种的２．１％、４３．９％、０．２％。 （３）六大生态群的平均多样指数依次为热带粳稻（１．２３１９）＞晚籼群（１．１７３８）＞普通粳群（１．１７２６）＞光 壳群（１．１６１８）＞早中籼群（１．１３７１）＞冬籼群（０．９８８９）；其地理生态分布与海拔、纬度密切相关。
The systematic classification and genetic variation of rice germplasm collected and conserved in Yunnan by the system of Cheng-Wang classification show that: (1) Yunnan is the largest genetic diversity center of China’s rice germplasm and the rich region with its high germplasm and its natural treasure house , Which was strongly influenced by the independent origin centers of two rice species in China and South Asia. Thus, the diversity of the types of rice species in Yunnan, especially in southwest Yunnan, has attracted worldwide attention. (2) There are two subspecies of indica and japonica rice and six ecological groups in Yunnan local rice species, of which tropical japonica rice, light shell japonica rice and common japonica rice accounted for 3.6% and 18.1% 32.1%. The early indica rice, late indica rice and winter indica rice accounted for 2.1%, 43.9% and 0.2% of the local rice varieties in Yunnan. (3) The average diversity index of the six ecological groups was in order of tropical japonica (1.2319)> late indica (1.1738)> common japonica (1.1726)> light shell (1.1618)> early Indica (1.1371)> winter indica (0.9889). Its geographical and ecological distribution is closely related to altitude and latitude.