文献类型： 外文期刊

作者： Ishikawa, R ¹ ; Yamanaka, S ² ; Fukuta, Y ³ ; Chitrakon, S; Bounphanousay, C; Kanyavong, K; Tang, LH; Nakamur ¹ ;

作者机构： 1.Hirosaki Univ, Lab Plant Breeding, Fac Agr & Life Sci, Hirosaki, Aomori 036, Japan

2.Hirosaki Univ, Lab Plant Breeding, Fac Agr & Life Sci, Hirosaki, Aomori 036, Japan; Univ Tsukuba, Ctr Gene Res, Tsukuba, Ibaraki 3058572, Japan; Int Rice Res Inst, Plant Breeding Genet & Biochem Div, Manila, Philippines; Rice Res Ctr, Latham, NY 12110 USA; Natl Agr Res Ctr Vientiane, Napok, Vientiane, Laos; Jiangsu Acad Agr Sci, Nanjing 210014, Jiangsu, Peoples R China; Chiba Univ, Grad Sch Sci & Technol, Matsudo, Chiba 2710092, Japan; Tohoku Univ, Grad Sch Life Sci, Sendai, Miyagi 9808577, Japan; Res Inst Human & Nat, Kamigyo Ku, Kyoto 6020878, Japan

3.Hirosaki Univ, Lab Plant Breeding, Fac Agr & Life Sci, Hirosaki, Aomori 036, Japan; Univ Tsukuba, Ctr Gene Res, Tsukuba, Ibaraki 3058572, Japan; Int Rice Res Inst, Plant Breeding Genet & Biochem Div, Manila, Philippines; Rice Res Ctr, Latham, NY 12110 USA; Natl Agr Res Ctr Vientiane, Napok, Vientiane, Laos; Jiangsu Acad Agr Sci, Nanjing 210014, Jiangsu, Peoples R China; Chiba Un

关键词： genetic erosion;isozyme;northern Thailand;plastid type;upland rice (Oryza sativa L.)

期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.524； 五年影响因子：1.713 ）

ISSN： 0925-9864

年卷期： 2006 年 53 卷 2 期

页码：

收录情况： SCI

摘要： The purpose of this study was to assess the extent of genetic erosion of traditional upland germplasm in northern Thailand as a result of gene-flow from distinct strains carrying different genotypes. Even modern variety specific markers have not been developed, there is a comparative population in Laos. Thus, both populations were compared with various characters to evaluate gene-flow from modern variety to landraces. Glutinous and glabrous strains are predominated in Laos. However, such strains were drastically decreased in north-east Thailand. Gene diversity is higher in Thailand, compared to Laos at seven isozyme loci. This was a result of the higher frequencies of Indica strains and heterozygotes in Thailand. Plastid type was also determined by using an INDEL marker. Nearly half of Indica strains carried the Japonica plastid. Heterozygotes also tended to carry Japonica cytoplasm. Such nuclear-cytoplasm substituted strains and heterozygotes were probably generated by natural hybridization. Japonica strains tended to be a maternal donor rather than Indica ones. Or Indica strains would easily release pollens, which grow outside of upland fields.