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Exploring Natural Allelic Variations of the beta-Triketone Herbicide Resistance Gene HIS1 for Application in indica Rice and Particularly in Two-Line Hybrid Rice

文献类型： 外文期刊

作者： Lv, Qiming 1 ; Zhang, Xiuli 1 ; Yuan, Dingyang 1 ; Huang, Zhiyuan 1 ; Peng, Rui 3 ; Peng, Jiming 1 ; Li, Zuren 4 ; Tang, 1 ;

作者机构： 1.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha, Peoples R China

2.Hunan Univ, Longping Branch, Grad Sch, Changsha, Peoples R China

3.Hunan Acad Agr Sci, Rice Res Inst, Changsha, Peoples R China

4.Hunan Acad Agr Sci, Hunan Agr Biotechnol Res Inst, Changsha, Peoples R China

5.Hunan Acad Agr Sci, Inst Plant Protect, Changsha, Peoples R China

6.Chinese Acad Sci, Inst Genet & Dev Biol, Beijing, Peoples R China

关键词： indica rice; Hybrid rice; HIS1 gene; beta-Triketone herbicides; Benzobicyclon

期刊名称：RICE （ 影响因子：4.783； 五年影响因子：5.23 ）

ISSN： 1939-8425

年卷期： 2021 年 14 卷 1 期

页码：

收录情况： SCI

摘要： Background: Benzobicyclon (BBC) is a beta-triketone herbicide (bTH) used in rice paddy fields. It has the advantages of high efficiency, low toxicity, high crop safety, and good environmental compatibility, and shows efficacy against paddy weeds resistant to other types of herbicides. However, as some important indica rice varieties are susceptible to BBC, BBC is currently only registered and applied in japonica rice cultivation areas. Results: By analyzing haplotypes of the bTHs broad-spectrum resistance gene HIS1 and phenotypes for BBC in 493 major indica rice accessions in China, we identified a novel non-functional allelic variant of HIS1 in addition to the previously reported 28-bp deletion. Through detection with markers specific to the two non-functional mutations, it was clear that 25.4% of indica conventional varieties, 59.9% of fertility restorers, and 15.9% of sterile lines were susceptible to BBC. In addition, due to natural allelic variations of the HIS1 gene in the sterile and restorer lines, some two-line hybrid sterile lines were sensitive to bTHs, and the corresponding restorers were resistant. We showed the potential effectiveness of using bTHs to address the issue of two-line hybrid rice seed purity stemming from the self-crossing of sterile lines during hybrid rice seed production. Finally, allelic variations of the HIS1 gene may also play an important role in the mechanized seed production of hybrid rice. Conclusions: Our findings offer guidance for the application of BBC in indica rice areas and provide a non-transgenic approach to address the seed purity issue of two-line hybrid rice.

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