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- W2391106334 abstract "Three Chinese taxonomic systems were used to analyze 5285 accessions of the indigenous rice germplasms collected and stored in Yunnan. The following results have been obtained: (1) Yunna represents the largest center of genetic diversity of rice in China. (2) The local cultivars of rice in Yunnan involve 58 varieties, equivalent to the total number of rice varieties in China, but the number of rice cultivars in Yunnan accounts for only 8.6% of the total in China. Common indica, red indica , red japonica , common japonica , common glutinous japonica and red nuda japonica are the predominant varieties. Greater variation is present in japonica subspecies than in indica subspecies with relatively high proportion of deep-color type and glutinous, nuda and hairy-husk varieties. (3) Yunnan local rice germplasms are composed of two subspecies (indica and japonica ) and 6 ecotypes. Varieties of javanica, nuda and communis japonica number 14, 13 and 18 and their cultivar numbers account for 3.6%, 18.1% and 32.1%, respectively, of the total in Yunnan; varieties of aus, aman and boro (indica subspecies) number 11, 26 and 4 and their cultivars account for 2.1%, 43.9% and 0.2%, respectively, of the total. (4) The local rice germplasms in Yunnan are composed of 26 varieties of indica subspecies and 32 varieties of japonica subspecies. Indica lowland rice and late rice form the basic types of indica subspecies while indica upland rice and early-middle rice represent the eco-variant type. In the japonica subspecies, no distinction of basic or variant type exists between lowland and upland rice, glutinous and non-glutinous rice, and early-middle and late rice. This is strikingly different from indica subspecies, an additional evidence to support the speculation that the indica and the japonica rice in Yunnan derive from of two independent centers of origin. (5) A new taxonomic system based on 5 grades (species, subspecies, eco-type, ecological variety group and cultivar) is formed and recommended for classification study of rice." @default.
- W2391106334 created "2016-06-24" @default.
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- W2391106334 date "2002-01-01" @default.
- W2391106334 modified "2023-09-25" @default.
- W2391106334 title "COMPARISON OF DIFFERENT CLASSIFICATION METHODS OF INDIGENOUS RICE GENOTYPES IN YUNNAN PROVINCE" @default.
- W2391106334 hasPublicationYear "2002" @default.
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