Xianqin Wei
Yi Zhou
Zhaozhe Xin
Yunheng Miao
Hongxia Hou
Jiaxing Li
Dan Zhao
Jing Liu
Rui Chen
Liming Niu
Guangchang Ma
Wenquan Zhen
Shunmin He
Jianxia Wang
Xunfan Wei
Weihao Dou
Zhuoxiao Sui
Haikuan Zhang
Shilai Xing
Miao Shi
Dawei Huang
aInstitute of Entomology, College of Life Sciences, Nankai University, Tianjin 300071, China
bInstitute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
cEnvironment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
dGuangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
eInstitute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
fBerry Genomics Corporation, Beijing 102206, China
More InformationCorresponding author: E-mail address: xiaojh@nankai.edu.cn (Jinhua Xiao);E-mail address: huangdw@ioz.ac.cn (Dawei Huang)
Received Date: 2021-01-19
Accepted Date:2021-02-28
Rev Recd Date:2021-02-14
Available Online: 2021-03-29 Publish Date:2021-03-20
Abstract
Abstract
Figs and fig pollinators are one of the few classic textbook examples of obligate pollination mutualism. The specific dependence of fig pollinators on the relatively safe living environment with sufficient food sources in the enclosed fig syconia implies that they are vulnerable to habitat changes. However, there is still no extensive genomic evidence to reveal the evolutionary footprint of this long-term mutually beneficial symbiosis in fig pollinators. In fig syconia, there are also non-pollinator species. The non-pollinator species differ in their evolutionary and life histories from pollinators. We conducted comparative analyses on 11 newly sequenced fig wasp genomes and one previously published genome. The pollinators colonized the figs approximately 66.9 million years ago, consistent with the origin of host figs. Compared with non-pollinators, many more genes in pollinators were subject to relaxed selection. Seven genes were absent in pollinators in response to environmental stress and immune activation. Pollinators had more streamlined gene repertoires in the innate immune system, chemosensory toolbox, and detoxification system. Our results provide genomic evidence for the differentiation between pollinators and nonpollinators. The data suggest that owing to the long-term adaptation to the fig, some genes related to functions no longer required are absent in pollinators.Keywords: Phylogenetics,
Natural selection,
Immunity,
Chemosensory,
Adaptive evolution
PDF全文下载地址:
http://www.jgenetgenomics.org/article/exportPdf?id=1b47e6b9-0da5-4022-aa13-eaaf5ca106d9&language=en
