Identification of QTLs associated with heat tolerance at the heading and flowering stage in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Li, Mao-mao

作者： Li, Mao-mao;Ma, Xiao-ding;Han, Long-zhi;Li, Mao-mao;Li, Xia;Yu, Li-qin;Wu, Jin-wen;Li, Hui;Liu, Jin;Jo, Su-min;Park, Dong-Soo;Song, Youchun;Shin, Dongjin

作者机构：

关键词： Rice (Oryza sativa L.); Heat stress; Flowering stage; Heat tolerance; QTL

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

ISSN： 0014-2336

年卷期： 2018 年 214 卷 4 期

页码：

收录情况： SCI

摘要： The ongoing rise in temperatures caused by global climate change is a critical climatic risk factor for rice production, and enhancing rice heat tolerance is an area of particular research interest. A recombinant inbred line (RIL) mapping population was developed from heat sensitive, rice cultivar IAPAR-9 crossed with heat tolerant, Liaoyan241. RIL and parental lines were exposed to high temperature at the heating and flowering stage in experiments in 2014 and 2015. As indicators of heat tolerance, the seed setting rate under natural (NS) and heat stress (HTS) conditions were measured, and the reduction rate of seed set (RRS) was calculated. Quantitative trait loci (QTL) analysis revealed eleven heat tolerance QTLs located on chromosomes 1, 3, 4, 5, and 6. Single QTL contribution rates were 4.75-13.81% and effect values were -5.98 to 5.00. Four major QTLs (qNS1, qNS4, qNS6, and qRRS1) were stable detected in different environments in both years. Thirteen QTLs with epistatic interactions and nine QTLs with environmental interactions were also detected. Major QTLs were all involved in epistatic and environmental interactions. Three QTLs from the SSR marker interval RM471 to RM177 region of chromosome 4 (qNS4, qHTS4, and qRRS4) were all involved in epistatic and environmental interactions and contributed to phenotypic variation, indicating that this region constituted a major QTL hotspot. The major QTL for heat tolerance identified in this study will aid in breeding tolerant cultivars and facilitating investigation of the molecular underpinnings of heat tolerance in rice.

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