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Position: Home > Articles > Fine mapping and candidate gene analysis of qHD1b, a QTL that promotes flowering in common wild rice (Oryza rufipogon) by up-regulating Ehd1 The Crop Journal 2022,10 (4)

Fine mapping and candidate gene analysis of qHD1b, a QTL that promotes flowering in common wild rice (Oryza rufipogon) by up-regulating Ehd1

作者：

Линг Лиу;Yingxin Zhang;Zhengfu Yang;Qinqin Yang;Yue Zhang;Peng Xu;Jiaxin Li;Anowerul Islam;Liaqat Ali Shah;Xiaodeng Zhan;Liyong Cao;Shifeng Cheng;Weixun W

关键词：

Rice;Heading date;Quantitative trait locus;qHD1b;Fine mappin

摘要：

Heading date (flowering time) determines the adaptability of cultivars to different environments. We report the fine mapping and candidate gene analysis of qHD1b, a quantitative trait locus (QTL) responsible for early flowering that was derived from common wild rice (O. rufipogon) under both short-day and long-day conditions. The introgression line IL7391, which carried segments from common wild rice in a Zhonghui 8015 (ZH8015) background, exhibited early heading compared to the background and was crossed with ZH8015 to generate BC5F2:3 families for QTL analysis. This enabled the identification of two heading-date QTL, named qHD1b and qHD7, of which the first was selected for further research. High-resolution linkage analysis was performed in BC5F4:5 and BC5F6 populations, and the location of qHD1b was confined to a 112.7-kb interval containing 17 predicted genes. Five of these genes contained polymorphisms in the promoter or coding regions and were thus considered as candidates. Expression analysis revealed a positive association between LOC_Os01g11940 expression and early heading. This locus was annotated as OsFTL1, which encodes an ortholog of Arabidopsis Flowering Locus T and was the most likely candidate gene for qHD1b. Our study revealed that qHD1b acts as a floral activator that promotes flowering by up-regulating Ehd1, Hd3a, RFT1, OsMADS14, and OsMADS15 under both short -day and long-day conditions. Field experiments showed that qHD1b affected several yield-related agronomic traits including 1000-grain weight and grain length. qHD1b could be useful for marker-assisted selection and breeding of early-maturing cultivars. (C) 2022 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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Fine mapping and candidate gene analysis of qHD1b, a QTL that promotes flowering in common wild rice (Oryza rufipogon) by up-regulating Ehd1

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