文献类型: 外文期刊
作者: Wang, Xiang 1 ; Zou, Baohong 1 ; Shao, Qiaolin 1 ; Cui, Yongmei 1 ; Lu, Shan 1 ; Zhang, Yan 1 ; Huang, Quansheng 2 ; Huan 1 ;
作者机构: 1.Nanjing Agr Univ, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China
2.Xinjiang Acad Agr Sci, Inst Nucl & Biol Technol, Urumqi 830091, Peoples R China
3.Cornell Univ, Plant Biol Sect, Sch Integrated Plant Sci, Ithaca
关键词: Gene expression;germination;rice;GWAS;low temperature;natural variation;OsSAP16
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: 2018 年 69 卷 3 期
页码:
收录情况: SCI
摘要: Low temperature affects seed germination in plants, and low-temperature germination (LTG) is an important agronomic trait. Natural variation of LTG has been reported in rice, but the molecular basis for this variation is largely unknown. Here we report the phenotypic analysis of LTG in 187 rice natural accessions and a genome-wide association study (GWAS) of LTG in this collection. A total of 53 quantitative trait loci (QTLs) were found to be associated with LTG, of which 20 were located in previously reported QTLs. We further identified Stress-Associated Protein 16 (OsSAP16), coding for a zinc-finger domain protein, as a causal gene for one of the major LTG QTLs. Loss of OsSAP16 function reduces germination while greater expression of OsSAP16 enhances germination at low temperature. In addition, accessions with extremely high and low LTG values have correspondingly high and low OsSAP16 expression at low temperatures, suggesting that variation in expression of the OsSAP16 gene contributes to LTG variation. As the first case of identification of an LTG gene through GWAS, this study indicates that GWAS of natural accessions is an effective strategy in genetically dissecting LTG processes and gaining molecular understanding of low-temperature response and germination.
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