近期论文
您的位置： 首页 > 科研成果 > 近期论文 >
QTL analysis for rice salinity tolerance and fne mapping of a candidate locus qSL7 for shoot length under salt stress
Noushin Jahan+, Yu Zhang+, Yang Lv, Mengqiu Song, Chunyan Zhao, Haitao Hu, Yongtao Cui, Zhongwei Wang, Shenglong Yang, Anpeng Zhang, Jiang Hu, Guoyou Ye, Qian Qian, Zhenyu Gao* and Longbiao Guo*
Plant Growth Regulation , 2020,90:307-319
DOI:10.1007/s10725-019-00566-3

Abstract


Salinity is one of the major abiotic stresses limiting rice production worldwide. Understanding the genetic basis of salinity tolerance is key for rice breeding. In this study, a recombinant inbred line (RIL) population derived from a super hybrid rice Liang–You–Pei–Jiu (LYP9) parents 93-11 and PA64s, exhibited variation in phenotypes including shoot length (SL), root length (RL), shoot fresh weight (SFW), root fresh weight (RFW), shoot dry weight (SDW), and root dry weight (RDW) under 50 and 100 mM NaCl stress. QTL analysis identified a total of 38 QTLs for these 6 traits under two distinct concentrations of salt, distributing on chromosomes 1, 2, 3, 4, 5, 6, 7 and 10. A total of 21 QTLs were found in 6 stable loci. A novel major QTL, qSL7 for shoot length on chromosome 7 was identified in two distinct concentrations. A chromosome segment substitution line (CSSL) harboring the qSL7 locus from PA64s with 93-11 background was developed and exhibited higher SL value, higher K+ concentration, and lower Na+ concentration compared to 93-11. With BC5F2:3 derived from CSSL-qSL7/93-11, the qSL7 was fine mapped within a 252.9 kb region on chromosome 7 where 40 annotated genes located including, LOC_Os07g43530, which encodes a DNA-binding domain containing protein reported previously as a transcription factor playing a positive role in salt stress tolerance. Our study provides new genetic resources for improvement of salinity tolerance in rice breeding.