Divergence and hybridization in the desert plant Reaumuria soongarica  

作　　者：Yong Shi Xia Yan Heng-Xia Yin Chao-Ju Qian Xing-Ke Fan Xiao-Yue Yin Yu-Xiao Chang Cheng-Jun Zhang Xiao-Fei Ma 

机构地区：[1]Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions,Northwest Institute of Eco-Environment and Resources,Chinese [2]Academy of Sciences,Lanzhou 730000,China [3]Germplasm Bank of Wild Species in Southwest China,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China [4]Key Laboratory of Eco-hydrology of Inland River Basin,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [5]State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University,Xining 810016,China [6]University of Chinese Academy of Sciences,Beijing 100049,China Agricultural Genomes Institute at Shenzhen,Chinese Academy of Agricultural Sciences,Shenzhen 518120,China

出　　处：《Journal of Systematics and Evolution》2020年第2期159-173,共15页植物分类学报（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(NSFC,Grant Nos.31370395,31500266,31770416,and 31571311);the"One Hundred Talents"projects of the Chinese Academy of Sciences(Grant No.29Y127E71);the Shenzhen Science and Technology Research Fund(JCYJ20150630165133393);by the Postdoctoral Targeted Fund of the Ministry of Human and Social Resources of Yun nan Province,China.We。

摘　　要：Speciation is widely accepted to be a complex and continuous process. Due to complicated evolutionary histories, desert plants are ideal model systems to understand the process of speciation along a continuum. Here, we elucidate the evolutionary history of Reaumuria soongarica (Pall.) Maxim., a typical desert plant that is wildly distributed across arid central Asia. Based on variation patterns present at nine nuclear loci in 325 individuals (representing 41 populations), we examined the demographic history, patterns of gene flow, and degree of ecological differentiation among wild R. soongarica. Our findings indicate that genetic divergence between the ancient western and eastern lineages of R. soongarica occurred approximately 0.714 Mya, probably due to the Kunlun–Yellow River tectonic movement and the Naynayxungla glaciation. Later, multiple hybridization events between the western and eastern lineages that took place between 0.287 and 0.543 Mya, and which might have been triggered by the asynchronous historical expansion of the western and eastern deserts, contributed to the formation of a hybrid northern lineage. Moreover, despite continuing gene flow into this population from its progenitors, the northern lineage maintained its genetic boundary by ecological differentiation. The northern lineage could be an incipient species, and provides an opportunity to study the continuous process of speciation. This study suggests that two opposite evolutionary forces, divergence and hybridization, coexisting in the continuous speciation of the desert plant R. soongarica in a short time. Moreover, we provide evidence that this continuous speciation process is affected by geological events, climatic change, and ecological differentiation.

关 键 词：ARID central Asia ecological SPECIATION GLACIATION hybrid SPECIATION QUATERNARY SPECIATION continuum 

分 类 号：Q94[生物学—植物学]