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排水隔离和气候变化驱动的种群扩张塑造了横断山区印度块菌复合体的遗传结构。

Drainage isolation and climate change-driven population expansion shape the genetic structures of Tuber indicum complex in the Hengduan Mountains region.

作者信息

Feng Bang, Zhao Qi, Xu Jianping, Qin Jiao, Yang Zhu L

机构信息

Key Laboratory for Plant Diversity and Biogeography of East Asia, Chinese Academy of Sciences, Kunming, Yunnan, China.

Department of Biology, McMaster University, Hamilton, Ontario, Canada.

出版信息

Sci Rep. 2016 Feb 24;6:21811. doi: 10.1038/srep21811.

Abstract

The orogenesis of the Qinghai-Tibetan Plateau and the Quaternary climate changes have played key roles in driving the evolution of flora and fauna in Southwest China, but their effects on higher fungi are poorly addressed. In this study, we investigated the phylogeographic pattern of the Tuber indicum species complex, an economically important fungal group distributed in the Hengduan Mountains region. Our data confirmed the existence of two distinct lineages, T. indicum and T. himalayense, within this species complex. Three geographic groups (Groups W, N and C) were revealed within T. indicum, with Group W found in the paleo-Lancang River region, while Groups N and C corresponded to the two banks along the contemporary Jinsha River, suggesting that rivers have acted as barriers for gene flow among populations from different drainages. Historical range expansion resulted from climate changes was inferred in Group C, contributing to the observed gene flow among geographic populations within this group. Although no significant geographic structure was identified in T. himalayense, evidence of drainage isolation for this species was also detected. Our findings demonstrate that both topographic changes and Quaternary climate oscillations have played important roles in driving the genetic structures of the T. indicum species complex.

摘要

青藏高原的造山运动和第四纪气候变化在中国西南地区动植物的演化过程中起到了关键作用,但它们对高等真菌的影响却鲜有研究。在本研究中,我们调查了印度块菌物种复合体的系统发育地理格局,该复合体是分布于横断山脉地区的一个具有重要经济价值的真菌类群。我们的数据证实,在这个物种复合体内存在两个不同的谱系,即印度块菌和喜马拉雅块菌。在印度块菌中发现了三个地理组(W组、N组和C组),W组分布于古澜沧江地区,而N组和C组分别对应现代金沙江的两岸,这表明河流成为了不同流域种群间基因流动的障碍。推断C组的历史分布范围扩张是由气候变化导致的,这促成了该组内地理种群间观察到的基因流动。尽管在喜马拉雅块菌中未发现显著的地理结构,但也检测到了该物种存在流域隔离的证据。我们的研究结果表明,地形变化和第四纪气候波动在驱动印度块菌物种复合体的遗传结构方面都发挥了重要作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f9be/4764814/f45667ae42b0/srep21811-f1.jpg

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