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对稻属（oryza）的14个种和李氏禾属（Leersia）的2个种共138份材料进行了叶绿体DNA限制性片段长度多态性的分析。用内切酶EcoRI酶切、4个叶绿体DNA探针杂交，共发现1o种叶绿体DNA变异类型。在稻属各个种内没有观察到叶绿体DNA的变异，叶绿体DNA变异类型基本上以稻属的染色体组型水平划分，因此认为精属的叶绿体DNA在进化过程中变异程度很低。推测CCDD组的o．alta、o．grandiglumis和o．latifolia及CC组的o．officinals和o.eichingeri各有共同的原始祖先。遗传距离分析显示CC、CCDD、BBCC组之间亲缘关系很近，这3个组与EE组亲缘关系也较近。李氏禾属的2个种L．perrieri和L．tisseranti与稻属的遗传距离很远。
A total of 138 species of 14 species of oryza and 2 species of Leersia were analyzed for chloroplast DNA restriction fragment length polymorphism. Digested with endonuclease EcoRI, four chloroplast DNA probes were hybridized to find 10 kinds of chloroplast DNA variation types. No variation of chloroplast DNA was observed in all species of the genus Oryza, and the types of chloroplast DNA variation were basically divided into the genotypes of the genus Oryza. Therefore, the variation degree of the chloroplast DNA of the genus Porphyromonas in the evolutionary process was considered to be very low. Speculate CCDD group o. alta, o. grandiglumis and o. latifolia and CC group o. Officinals and o.eichingeri each have a common original ancestor. Genetic distance analysis showed that the relationship between CC, CCDD and BBCC groups was very close, and the three groups had closer genetic relationship with EE group. Two species of L. laevigata perrieri and L. Tisseranti is genetically distant from the genus Oryza.