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

• 作者: Bowen Jiang Chu-Yu Ye Chulong Zhang Dongya Wu Elizabeth A.Kellogg Jie Qiu Kenneth M.Olsen Lang Pan Lei Jia Lianyang Bai Lifeng Wang Lingfeng Mao Longbiao Guo Longjiang Fan Meihong Chen Qiong Peng Sangting Lao Wei Tang Xiaoxiao Feng
• 来源期刊: 分子植物（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: Research Articles
• 页码范围: 1298-1310
• 页数: 13页
• 语种: 英文

摘要

The hexaploid species Echinochloa crus-galli is one of the most detrimental weeds in crop fields,especially in rice paddies.Its evolutionary history is similar to that of bread wheat,arising through polyploidization after hybridization between a tetraploid and a diploid species.In this study,we generated and analyzed high-quality genome sequences of diploid (E.haploclada),tetraploid (E.oryzicola),and hexaploid (E.crus-galli) Echinochloa species.Gene 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 polypioidization,suggesting that natural selection might favor reduced investment in resistance in this weed to maximize its growth and reproduction.In 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 E.oryzicola and E.crus-galli.In addition,distinctive differences in subgenome transcriptome dynamics during hexaploidization were observed between E.crus-galli and bread wheat.Collectively,our study documents genomic mechanisms underlying the adaptation of a major agricultural weed during polyploidization.The 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.