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Genomic analyses provide insights into the polyploidization-driven herbicide adaptation in Leptochloa weeds

文献类型： 外文期刊

作者： Chen, Ke 1 ; Yang, Haona 1 ; Peng, Yajun 1 ; Liu, Ducai 5 ; Zhang, Jingyuan 6 ; Zhao, Zhenghong 1 ; Wu, Lamei 5 ; Lin, Tao 7 ; Bai, Lianyang 1 ; Wang, Lifeng 1 ;

作者机构： 1.Hunan Acad Agr Sci, State Key Lab Hybrid Rice, Changsha, Peoples R China

2.Hunan Acad Agr Sci, Hunan Rice Res Inst, Key Lab Indica Rice Genet & Breeding Middle & Lowe, Minist Agr & Rural Affairs, Changsha, Peoples R China

3.Huangpu Res Inst Longping Agr Sci & Technol, Guangzhou, Peoples R China

4.Hunan Univ, Coll Biol, Longping Branch, Changsha, Peoples R China

5.Hunan Acad Agr Sci, Hunan Agr Biotechnol Res Inst, Hunan Weed Sci Key Lab, Changsha, Peoples R China

6.Qingdao Kingagroot Cpds Co Ltd, Qingdao, Peoples R China

7.China Agr Univ, Coll Hort, State Key Lab Agrobiotechnol, Beijing Key Lab Growth & Dev Regulat Protected Veg, Beijing, Peoples R China

关键词： Leptochloa weeds; comparative genomics; genome polyploidization; genome evolution; herbicide resistance

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）

ISSN： 1467-7644

年卷期： 2023 年 21 卷 8 期

页码：

收录情况： SCI

摘要： Polyploidy confers a selective advantage under stress conditions; however, whether polyploidization mediates enhanced herbicide adaptation remains largely unknown. Tetraploid Leptochloa chinensis is a notorious weed in the rice ecosystem, causing severe yield loss in rice. In China, L. chinensis has only one sister species, the diploid L. panicea, whose damage is rarely reported. To gain insights into the effects of polyploidization on herbicide adaptation, we first assembled a high-quality genome of L. panicea and identified genome structure variations with L. chinensis. Moreover, we identified herbicide-resistance genes specifically expanded in L. chinensis, which may confer a greater herbicide adaptability in L. chinensis. Analysis of gene retention and loss showed that five herbicide target-site genes and several herbicide nontarget-site resistance gene families were retained during polyploidization. Notably, we identified three pairs of polyploidization-retained genes including LcABCC8, LcCYP76C1 and LcCYP76C4 that may enhance herbicide resistance. More importantly, we found that both copies of LcCYP76C4 were under herbicide selection during the spread of L. chinensis in China. Furthermore, we identified another gene potentially involved in herbicide resistance, LcCYP709B2, which is also retained during polyploidization and under selection. This study provides insights into the genomic basis of the enhanced herbicide adaptability of Leptochloa weeds during polyploidization and provides guidance for the precise and efficient control of polyploidy weeds.

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