遗传和环境依赖过程推动了中国孑遗特有种珙桐属的种间和种内分化。

IF 4.6 1区 生物学 Q1 PLANT SCIENCES
Plant Diversity Pub Date : 2024-04-26 eCollection Date: 2024-09-01 DOI:10.1016/j.pld.2024.04.008
Tao Zhou, Xiaodan Chen, Jordi López-Pujol, Guoqing Bai, Sonia Herrando-Moraira, Neus Nualart, Xiao Zhang, Yuemei Zhao, Guifang Zhao
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引用次数: 0

摘要

中国是曾广泛分布于北半球的孑遗植物物种的热点地区。最新研究表明,中国中部和西南部山区存在长期稳定的避难所,使得这些物种在新近纪晚期的气候波动中得以延续。Dipteronia是其中的一个孑遗种,其化石记录可追溯到古新世。在这里,我们研究了目前公认的两个Dipteronia物种(D ipteronia sinensis和D. dyeriana)的遗传变异性、人口动态和多样化模式。通过对三个 cpDNA 区域、两个单拷贝核基因和 15 个简单序列重复位点进行基因分型,我们获得了 45 个 Dipteronia 种群的分子数据。遗传研究与环境空间生态位比较分析、生态位建模和景观连通性分析相结合。我们发现,这两种 Dipteronia 在遗传学和生态学方面都存在高度分化。尽管在D. sinensis中可以观察到初步的物种分化过程,但长期稳定的避难所,特别是沿大巴山-西秦岭的扩散走廊,可能确保了其迄今为止遗传和生态的完整性。我们的研究不仅有助于我们了解Dipteronia种群如何应对新生代的构造和气候变化,还有助于我们深入了解东亚地区的始新世孑遗植物是如何生存、进化和多样化的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Genetically- and environmentally-dependent processes drive interspecific and intraspecific divergence in the Chinese relict endemic genus Dipteronia.

China is a hotspot of relict plant species that were once widespread throughout the Northern Hemisphere. Recent research has demonstrated that the occurrence of long-term stable refugia in the mountainous regions of central and south-western China allowed their persistence through the late Neogene climate fluctuations. One of these relict lineages is Dipteronia, an oligotypic tree genus with a fossil record extending to the Paleocene. Here, we investigated the genetic variability, demographic dynamics and diversification patterns of the two currently recognized Dipteronia species (D ipteronia sinensis and D . dyeriana). Molecular data were obtained from 45 populations of Dipteronia by genotyping three cpDNA regions, two single copy nuclear genes and 15 simple sequence repeat loci. The genetic study was combined with niche comparison analyses on the environmental space, ecological niche modeling, and landscape connectivity analysis. We found that the two Dipteronia species have highly diverged both in genetic and ecological terms. Despite the incipient speciation processes that can be observed in D. sinensis, the occurrence of long-term stable refugia and, particularly, a dispersal corridor along Daba Shan-west Qinling, likely ensured its genetic and ecological integrity to date. Our study will not only help us to understand how populations of Dipteronia species responded to the tectonic and climatic changes of the Cenozoic, but also provide insight into how Arcto-Tertiary relict plants in East Asia survived, evolved, and diversified.

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来源期刊
Plant Diversity
Plant Diversity Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
8.30
自引率
6.20%
发文量
1863
审稿时长
35 days
期刊介绍: Plant Diversity (formerly Plant Diversity and Resources) is an international plant science journal that publishes substantial original research and review papers that advance our understanding of the past and current distribution of plants, contribute to the development of more phylogenetically accurate taxonomic classifications, present new findings on or insights into evolutionary processes and mechanisms that are of interest to the community of plant systematic and evolutionary biologists. While the focus of the journal is on biodiversity, ecology and evolution of East Asian flora, it is not limited to these topics. Applied evolutionary issues, such as climate change and conservation biology, are welcome, especially if they address conceptual problems. Theoretical papers are equally welcome. Preference is given to concise, clearly written papers focusing on precisely framed questions or hypotheses. Papers that are purely descriptive have a low chance of acceptance. Fields covered by the journal include: plant systematics and taxonomy- evolutionary developmental biology- reproductive biology- phylo- and biogeography- evolutionary ecology- population biology- conservation biology- palaeobotany- molecular evolution- comparative and evolutionary genomics- physiology- biochemistry
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