A high frequency of allopolyploid speciation in the gymnospermous genus Ephedra and its possible association with some biological and ecological features

2016-03-31

作 者:Wu H, Ma Z, Wang MM, Qin AL, Ran JH, Wang XQ*

影响因子: 6.494

刊物名称: Molecular Ecology

出版年份: 2016

卷: 25 期: 5 页码: 1192-1210

文章摘要 :

The origin and evolution of polyploids have been studied extensively in angiosperms and ferns but very rarely in gymnosperms. With the exception of three species of conifers, all natural polyploid species of gymnosperms belong to Ephedra, in which more than half of the species show polyploid cytotypes. Here, we investigated the origin and evolution of polyploids of Ephedra distributed in the Qinghai–Tibetan Plateau (QTP) and neighbouring areas. Flow cytometry (FCM) was used to measure the ploidy levels of the sampled species that are represented by multiple individuals from different populations, and then, two single-copy nuclear genes (LFY and DDB2) and two chloroplast DNA fragments were used to unravel the possible origins and maternal donors of the polyploids. The results indicate that the studied polyploid species are allopolyploids, and suggest that allotetraploidy is a dominant mode of speciation in Ephedra. The high percentage of polyploids in the genus could be related to some of its biological attributes such as vegetative propagation, a relatively high rate of unreduced gamete formation, and a small genome size relative to most other gymnosperms. Significant ecological divergences between allotetraploids and their putative progenitors were detected by PCAs and anova and Tukey's tests, with the exception of E. saxatilis. The overlap of geographical distributions and ecological niches of some diploid species could have provided opportunities for interspecific hybridization and allopolyploid speciation.

全文链接

http://onlinelibrary.wiley.com/doi/10.1111/mec.13538/epdf


附件下载:

位于北京西部香山脚下的中国科学院植物研究所是我国系统与进化生物学领域的第一个重点实验室

版权所有 © 系统与进化植物学重点实验室[中国科学院植物研究所]
ICP备16067583号-12 网站管理

联系我们

  • 地址:北京市海淀区 香山南辛村20号
  • 邮编:100093
  • 电话:010-6283 6086
  • 传真:010-6283 6095
  • 电邮:lseb@ibcas.ac.cn

语言切换