Chromosome-level genome assembly and population genomic analyses provide insights into adaptive evolution of the red turpentine beetle, Dendroctonus valens
文献类型: 外文期刊
第一作者: Liu, Zhudong
作者: Liu, Zhudong;Xing, Longsheng;Sun, Jianghua;Liu, Zhudong;Sun, Jianghua;Xing, Longsheng;Liu, Bo;Wan, Fanghao;Qian, Wanqiang;Huang, Wanlong;Raffa, Kenneth F.;Hofstetter, Richard W.
作者机构:
关键词: Biological invasion; Red turpentine beetle; Genomics; Population genetic structure; Selective sweep; Adaptive evolution
期刊名称:BMC BIOLOGY ( 影响因子:7.364; 五年影响因子:8.641 )
ISSN:
年卷期: 2022 年 20 卷 1 期
页码:
收录情况: SCI
摘要: Background Biological invasions are responsible for substantial environmental and economic losses. The red turpentine beetle (RTB), Dendroctonus valens LeConte, is an important invasive bark beetle from North America that has caused substantial tree mortality in China. The lack of a high-quality reference genome seriously limits deciphering the extent to which genetic adaptions resulted in a secondary pest becoming so destructive in its invaded area. Results Here, we present a 322.41 Mb chromosome-scale reference genome of RTB, of which 98% of assembled sequences are anchored onto fourteen linkage groups including the X chromosome with a N50 size of 24.36 Mb, which is significantly greater than other Coleoptera species. Repetitive sequences make up 45.22% of the genome, which is higher than four other Coleoptera species, i.e., Mountain pine beetle Dendroctonus ponderosae, red flour beetle Tribolium castaneum, blister beetle Hycleus cichorii, and Colorado potato beetle Leptinotarsa decemlineata. We identify rapidly expanded gene families and positively selected genes in RTB, which may be responsible for its rapid environmental adaptation. Population genetic structure of RTB was revealed by genome resequencing of geographic populations in native and invaded regions, suggesting substantial divergence of the North American population and illustrates the possible invasion and spread route in China. Selective sweep analysis highlighted the enhanced ability of Chinese populations in environmental adaptation. Conclusions Overall, our high-quality reference genome represents an important resource for genomics study of invasive bark beetles, which will facilitate the functional study and decipher mechanism underlying invasion success of RTB by integrating the Pinus tabuliformis genome.
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