文献类型： 外文期刊

作者： Xu, Jian-Long ¹ ; Wang, Jun-Min ² ; Sun, Ye-Qing ² ; Wei, Li-Jun ² ; Luo, Rong-Ting ³ ; Zhang, Ming-Xian; Li, Zhi-K ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Gener Resources & Genet Improvemen, Beijing 100081, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Gener Resources & Genet Improvemen, Beijing 100081, Peoples R China; Zhejiang Acad Agr Sci, Hangzhou 310021, Peoples R China; Harbin Inst Technol, Harbin 150001, Peoples R China; Int Rice Res Inst, Manila, Philippines

3.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Gener Resources & Genet Improvemen, Be

关键词： genetic load;mutagenesis;gamma-rays;radiation damage;radiosensitivity;spaceflight

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2006 年 57 卷 11 期

页码：

收录情况： SCI

摘要： Genetic load in the genome of the model species, rice, was genetically dissected by mapping quantitative trait loci (QTLs) affecting the radiosensitivity of 226 recombinant inbred lines (RILs) to gamma-ray- and spaceflight-induced radiation. The parents and RILs varied considerably in their radiosensitivity to gamma-ray irradiation. A total of 28 QTLs affecting the two index traits, seedling height (SH) and seed fertility (SF), of radiosensitivity were identified. The japonica parent, Lemont, was much more sensitive to gamma-ray irradiation than the indica parent, Teqing, and its alleles at almost all QTLs were associated with increased radiosensitivity, suggesting a much higher genetic load in the japonica genome of rice. Six QTLs (QSh2a, QSh2b, QSh5a, QSh7, QSf3b, and QSf10b) were located in the genomic regions particularly sensitive to radiation and thus might represent possible 'mutation hot spots' in the japonica genome. Detailed characterization of these genomic regions may shed light on the evolution and subspecific differentiation of rice.