文献类型： 外文期刊
作者： Quan, Ruidang 1 ; Wang, Juan 1 ; Hui, Jian 3 ; Bai, Haibo 3 ; Lyu, Xuelian 3 ; Zhu, Yongxing 3 ; Zhang, Haiwen 1 ; Zhang, 1 ;
作者机构： 1.Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing, Peoples R China
2.Natl Key Facil Crop Gene Resources & Genet Improv, Beijing, Peoples R China
3.Ningxia Acad Agr & Forestry Sci, Yinchuan, Peoples R China
4.Ningxia Acad Agr & Forestry Sci, Yinchuan, Peoples R C
关键词： wild rice;cultivated rice;salt tolerance;QTL;gene introgression
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）
ISSN： 1664-462X
年卷期： 2018 年 8 卷
页码：
收录情况： SCI
摘要： Salt stress causes significant reductions in rice production worldwide; thus, improving salt tolerance is a promising approach to meet the increasing food demand. Wild rice germplasm is considered a valuable genetic resource for improving rice cultivars. However, information regarding the improvement of salt tolerance in cultivated rice using wild rice genes is limited. In this study, we identified a salt-tolerant line Dongxiang/Ningjing 15 (DJ15) under salt-stress field conditions from the population of a salt tolerant Dongxiang wild rice x a cultivated rice variety Ningjing16 (NJ16). Genomic resequencing analysis of NJ16, DJ15 and Dongxiang wild rice revealed that the introgressed genomic fragments were unevenly distributed over the 12 chromosomes (Chr.) and mainly identified on Chr. 6, 7, 10, and 11. Using quantitative trait locus (QTL) mapping, we found 9 QTL for salt tolerance (qST) at the seedling stage located on Chr. 1, 3, 4, 5, 6, 8, and 10. In addition, sequence variant analysis within the QTL regions demonstrated that SKC1/HKT8/HKT1; 5 and HAK6 transporters along with numerous transcriptional factors were the candidate genes for the salt tolerant QTL. The DJ15/Koshihikari recombinant inbred lines that contained both qST1.2 and qST6, two QTL with the highest effect for salt tolerance, were more tolerant than the parental lines under salt-stress field conditions. Furthermore, the qST6 near-isogenic lines with IR29 background were more tolerant than IR29, indicating that qST1.2 and qST6 could improve salt tolerance in rice. Overall, our study indicates that wild rice genes could markedly improve the salt tolerance of cultivated rice.
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