Validating a segment on chromosome 7 of japonica for establishing low-cadmium accumulating indica rice variety
文献类型： 外文期刊
作者： Wang, Kai 1 ; Yan, Tian-ze 1 ; Xu, Shi-long 1 ; Yan, Xu 1 ; Zhou, Qun-feng 1 ; Zhao, Xin-hui 1 ; Li, Yan-feng 1 ; Wu, Zho 1 ;
作者机构： 1.Yuan Longping High Tech Agr Co Ltd, Minist Agr & Rural Affairs, Key Lab Southern Rice Innovat & Improvement, Hunan Engn Lab Dis & Pest Resistant Rice Breeding, Changsha 410128, Peoples R China
2.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China
3.Hunan Normal Univ, Dept Bot, Coll Life Sci, Changsha 410081, Peoples R China
4.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China
期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.998； 五年影响因子：4.576 ）
ISSN： 2045-2322
年卷期： 2021 年 11 卷 1 期
页码：
收录情况： SCI
摘要： Cadmium (Cd) contamination of rice is a serious food safety issue that has recently been gaining significant public attention. Therefore, reduction of Cd accumulation in rice grains is an important objective of rice breeding. The use of favourable alleles of Cd accumulating genes using marker-assisted selection (MAS) is theoretically feasible. In this study, we validated a segment covering OsHMA3-OsNramp5-OsNramp1 on chromosome 7 of japonica for establishing low-cadmium accumulating indica rice variety. The OsHMA3-OsNramp5-OsNramp1(jap) haplotype significantly decreased grain Cd concentration in middle-season indica genetic background. The improved 9311 carrying the OsHMA3-OsNramp5-OsNramp1(jap) haplotype with recurrent parent genome recovery of up to 91.6% resulted in approximately 31.8% decrease in Cd accumulation in the grain and with no penalty on yield. There is a genetic linkage-drag between OsHMA3-OsNramp5-OsNramp1 (jap) and the gene conditioning heading to days (HTD) in the early-season indica genetic background. Because the OsHMA3-OsNramp5-OsNramp1-Ghd7(jap) haplotype significantly increases grain Cd concentration and prolongs growth duration, the linkage-drag between OsHMA3-OsNramp5-OsNramp1 and Ghd7 should be broken down by large segregating populations or gene editing. A novel allele of OsHMA3 was identified from a wide-compatibility japonica cultivar, the expression differences of OsNramp1 and OsNramp5 in roots might contribute the Cd accumulating variation between japonica and indica variety.
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