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Detection and verification of QTLs associated with heat-induced quality decline of rice (Oryza sativa L.) using recombinant inbred lines and near-isogenic lines

机译：利用重组自交系和近等基因系检测和验证与热诱导水稻品质下降相关的QTL

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摘要

Decline in the apparent quality of rice (Oryza sativa L.) grain due to high temperatures during ripening recently became a major concern in many areas in Japan. The occurrence of white-back kernels (WBK) is one of the main problems of heat-induced quality decline. We identified QTLs associated with the occurrence of WBK using recombinant inbred lines (RILs) and verified their effects using near-isogenic lines (NILs). The QTL analysis used F7 and F8 RILs derived from ‘Hana-echizen’ (HE), which is tolerant to high temperature, × ‘Niigata-wase’ (NW), which is sensitive to high temperature. Four QTLs were identified on chromosomes 3, 4, 6, and 9 (qWB3, qWB4, qWB6 and qWB9). To verify the effects of qWB6 and qWB9, we developed two NILs in which qWB6 or both were introduced from HE into the NW background. The HE allele at qWB6 significantly decreased WBK under multiple environments. The combination of qWB6 and qWB9 in an F2 population derived from a cross between a NIL and NW showed that the NW allele at qWB9 significantly decreased WBK if the qWB6 allele was HE. These results will be of value in marker-assisted selection for the breeding of rice with tolerance to heat-induced quality decline.
机译：近来，由于成熟期间的高温，稻米（Oryza sativa L.）谷物的表观品质下降已成为日本许多地区的主要问题。白背仁（WBK）的出现是热引起质量下降的主要问题之一。我们使用重组自交系（RIL）鉴定了与WBK发生有关的QTL，并使用近等基因系（NIL）验证了其作用。 QTL分析使用源自耐高温的“ Hana-echizen”（HE）和对高温敏感的“ Niigata-wase”（NW）衍生的F7和F8 RIL。在3号，4号，6号和9号染色体上鉴定了四个QTL（qWB3，qWB4，qWB6和qWB9）。为了验证qWB6和qWB9的效果，我们开发了两个NIL，其中将qWB6或两者从HE引入到NW背景中。在多个环境下，qWB6的HE等位基因显着降低了WBK。来自NIL和NW杂交的F2群体中qWB6和qWB9的组合显示，如果qWB6等位基因是HE，则qWB9的NW等位基因会显着降低WBK。这些结果将在耐热诱导品质下降的水稻育种的标记辅助选择中具有价值。

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