Adaptive divergence with gene flow in incipient speciation of Miscanthus floridulus/sinensis complex (Poaceae)

Chao Li Huang, Chuan Wen Ho, Yu Chung Chiang, Yasumasa Shigemoto, Tsai Wen Hsu, Chi Chuan Hwang, Xue Jun Ge, Charles Chen, Tai Han Wu, Chang Hung Chou, Hao Jen Huang, Takashi Gojobori, Naoki Osada, Tzen Yuh Chiang

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

摘要

Young incipient species provide ideal materials for untangling the process of ecological speciation in the presence of gene flow. The Miscanthus floridulus/sinensis complex exhibits diverse phenotypic and ecological differences despite recent divergence (approximately 1.59 million years ago). To elucidate the process of genetic differentiation during early stages of ecological speciation, we analyzed genomic divergence in the Miscanthus complex using 72 randomly selected genes from a newly assembled transcriptome. In this study, rampant gene flow was detected between species, estimated as M = 3.36 × 10-9 to 1.20 × 10-6, resulting in contradicting phylogenies across loci. Nevertheless, beast analyses revealed the species identity and the effects of extrinsic cohesive forces that counteracted the non-stop introgression. As expected, early in speciation with gene flow, only 3-13 loci were highly diverged; two to five outliers (approximately 2.78-6.94% of the genome) were characterized by strong linkage disequilibrium, and asymmetrically distributed among ecotypes, indicating footprints of diversifying selection. In conclusion, ecological speciation of incipient species of Miscanthus probably followed the parapatric model, whereas allopatric speciation cannot be completely ruled out, especially between the geographically isolated northern and southern M. sinensis, for which no significant gene flow across oceanic barriers was detected. Divergence between local ecotypes in early-stage speciation began at a few genomic regions under the influence of natural selection and divergence hitchhiking that overcame gene flow.

原文English
頁(從 - 到)834-847
頁數14
期刊Plant Journal
80
發行號5
DOIs
出版狀態Published - 2014 十二月 1

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science
  • Cell Biology

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