Sympatric speciation of wild emmer wheat driven by ecology and chromosomal rearrangements
文献类型： 外文期刊
作者： Wang, Hongwei 1 ; Yin, Huayan 2 ; Jiao, Chengzhi 3 ; Fang, Xiaojian 1 ; Wang, Guiping 1 ; Li, Guangrong 4 ; Ni, Fei 1 ; L 1 ;
作者机构： 1.Shandong Agr Univ, Coll Agron, State Key Lab Crop Biol, Shandong Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China
2.Qingdao Agr Univ, Coll Agron, Qingdao 266109, Peoples R China
3.Novogene Bioinformat Inst, Beijing 100083, Peoples R China
4.Univ Elect Sci & Technol China, Sch Life Sci & Technol, Ctr Informat Biol, Chengdu 610054, Peoples R China
5.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China
6.Zhengzhou Univ, Sch Life Sci, Zhengzhou 450001, Peoples R China
7.Univ Haifa, Inst Evolut, IL-3498838 Haifa, Israel
8.Shandong Agr Univ, State Key Lab Crop Biol, Shandong Key Lab Crop Biol, Coll Agron, Tai An 271018, Shandong, Peoples R China
关键词： sympatric speciation; wild emmer wheat; Robertsonian translocation; abiotic stress; biotic stress
期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：11.205； 五年影响因子：12.291 ）
ISSN： 0027-8424
年卷期： 2020 年 117 卷 11 期
页码：
收录情况： SCI
摘要： In plants, the mechanism for ecological sympatric speciation (SS) is little known. Here, after ruling out the possibility of secondary contact, we show that wild emmer wheat, at the microclimatically divergent microsite of "Evolution Canyon" (EC), Mt. Carmel, Israel, underwent triple SS. Initially, it split following a bottleneck of an ancestral population, and further diversified to three isolated populations driven by disruptive ecological selection. Remarkably, two postzygotically isolated populations (SFS1 and SFS2) sympatrically branched within an area less than 30 m at the tropical hot and dry savannoid south-facing slope (SFS). A series of homozygous chromosomal rearrangements in the SFS1 population caused hybrid sterility with the SFS2 population. We demonstrate that these two populations developed divergent adaptive mechanisms against severe abiotic stresses on the tropical SFS. The SFS2 population evolved very early flowering, while the SFS1 population alternatively evolved a direct tolerance to irradiance by improved ROS scavenging activity that potentially accounts for its evolutionary fate with unstable chromosome status. Moreover, a third prezygotically isolated sympatric population adapted on the abutting temperate, humid, cool, and forested north-facing slope (NFS), separated by 250 m from the SFS wild emmer wheat populations. The NFS population evolved multiple resistant loci to fungal diseases, including powdery mildew and stripe rust. Our study illustrates how plants sympatrically adapt and speciate under disruptive ecological selection of abiotic and biotic stresses.
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