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The Genomes of the Allohexaploid Echinochloa crus-galli and Its Progenitors Provide Insights into Polyploidization-Driven Adaptation

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Molecular Plant 2020年第9期13卷 1298-1310页

作者： Chu-Yu Ye Dongya Wu Lingfeng Mao Lei Jia Jie Qiu Sangting Lao Meihong Chen Bowen Jiang Wei Tang Qiong Peng Lang Pan Lifeng Wang Xiaoxiao Feng Longbiao Guo Chulong Zhang elizabeth a.kellogg Kenneth M.Olsen Lianyang Bai Longjiang Fan Institute of Crop Sciences&Institute of Bioinformatics Zhejiang UniversityHangzhou 310058China Shanghai Key Laboratory of Plant Molecular Sciences College of Life SciencesShanghai Normal UniversityShanghai 200235China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China Hunan Weed Science Key Laboratory Hunan Academy of Agriculture ScienceChangsha 410125China Agricultural Experiment Station Zhejiang UniversityHangzhou 310058China lnstitute of Biotechnology Zhejiang UniversityHangzhou 310058China Donald Danforth Plant Science Center St.LouisMO 63132USA Department of Biology Washington University in St.LouisSt.LouisMO 63130USA

The hexaploid species Echinochloa crus-galli is one of the most detrimental weeds in crop fields,especially in rice *** evolutionary history is similar to that of bread wheat,arising through polyploidization after hybridization between a tetraploid and a diploid *** this study,we generated and analyzed high-quality genome sequences of diploid(***),tetraploid(***),and hexaploid(***-galli)Echinochloa *** family analysis showed a significant loss of disease-resistance genes such as those encoding NB-ARC domain-containing proteins during Echinochloa polyploidization,contrary to their significant expansionduring wheat polyploidization,suggesting that natural selection might favor reduced investment in resistance in this weed to maximize its growth and *** contrast to the asymmetric patterns of genome evolution observed in wheat and other crops,no significant differences in selection pressure were detected between the subgenomes in *** and *** addition,distinctive differences in subgenome transcriptome dynamics during hexaploidization were observed between ***-galli and bread ***,our study documents genomic mechanisms underlying the adaptation of a major agricultural weed during *** genomic and transcriptomic resources of three Echinochloa species and new insights into the polyploidization-driven adaptive evolution would be useful for future breeding cereal crops.

关键词： breeding crops ation

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