期刊
MOLECULAR BREEDING
卷 37, 期 12, 页码 -出版社
SPRINGER
DOI: 10.1007/s11032-017-0737-2
关键词
Rice; Drought; Yield; Submergence; QTL; MABB
资金
- Bill & Melinda Gates Foundation
TDK1 is a popular rice variety from the Lao PDR. Originally developed for irrigated conditions, this variety suffers a high decline in yield under drought conditions. Studies have identified three quantitative trait loci (QTLs) for grain yield under drought conditions, qDTY (3.1) , qDTY (6.1) , and qDTY (6.2) , that show a high effect in the background of this variety. We report here the pyramiding of these three QTLs with SUB1 that provides 2-3 weeks of tolerance to complete submergence, with the aim to develop drought- and submergence-tolerant near-isogenic lines (NILs) of TDK1. We used a tandem approach that combined marker-assisted backcross breeding with phenotypic selection to develop NILs with high yield under drought stress and non-stress conditions and preferred grain quality. The effect of different QTL combinations on yield and yield-related traits under drought stress and non-stress conditions is also reported. Our results show qDTY (3.1) to be the largest and most consistent QTL affecting yield under drought conditions, followed by qDTY (6.1) and qDTY (6.2) , respectively. QTL class analysis also showed that lines with a combination of qDTY (3.1) and qDTY (6.1) consistently showed a higher tolerance to drought than those in which one of these QTLs was missing. In countries such as Lao PDR, where large areas under rice cultivation suffer vegetative-stage submergence and reproductive-stage drought, these lines could ensure yield stability. These lines can also serve as valuable genetic material to be used for further breeding of high-yielding, drought- and submergence-tolerant varieties in local breeding programs.
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