东亚 Leptocorisa 姐妹物种分化的系统地理学和当地环境适应性

IF 3.7 1区 生物学 Q1 Agricultural and Biological Sciences
Xue Dong, Xiuxiu Zhu, Zechen Tang, Wenbo Yi, Huaijun Xue, Zhen Ye, Chenguang Zheng, Wenjun Bu
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引用次数: 0

摘要

在基因组水平上充分了解当地的适应性将有助于阐明其在近缘物种之间的分化中所起的作用。这项研究的重点是稻种虫的姊妹种(Leptocorisa chinensis 和 Leptocorisa oratoria),它们原产于东亚,是针对正在生长的稻穗的臭名昭著的害虫。众所周知,东亚地区多样的地质和多变的气候对生物产生了深远的影响。在这项研究中,我们利用双酶切限制性位点相关 DNA 测序的单核苷酸多态性(SNPs)和地理分布信息来研究系统地理学,并评估环境对遗传变异的影响。我们发现姊妹物种之间存在明显的遗传分化,但物种内部缺乏遗传结构,因为它们具有远距离扩散能力。人口统计模型涉及这样一种情况,即在隔离状态下发生分化(约 0.6 Ma),随后发生二次接触(约 7 kya)。最初的分化可能是由于更新世气候震荡期间东亚季风的加强造成的。历史人口统计表明,有效种群规模(Ne)从 9 千年到 7 千年出现了明显的增长,这可能与全新世期间水稻驯化和人类广泛耕作有关。我们还发现遗传距离和环境距离与它们之间的生态位差异之间存在明显的相关性。温度相关变量被列为造成差异的主要因素,并鉴定出410个参与适应的选择性SNPs。中国南方的南岭山脉是它们之间的地理分界线,也是促进当地环境适应的生态屏障带。我们的研究表明,历史气候变化和气候诱导的局部适应性选择塑造了姊妹物种的系统地理格局。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phylogeography and local environmental adaptation in the differentiation of Leptocorisa sister species in East Asia
A full understanding of local adaptation at the genomic level will help to elucidate its role in the differentiation between closely related species. This study focused on rice seed bugs sister species (Leptocorisa chinensis and Leptocorisa oratoria), which are native to East Asia and are notorious pests targeting growing rice spikelets. East Asia is a region where diverse geology and fluctuating climate are known to have profound impacts on organisms. In this study, single nucleotide polymorphisms (SNPs) from double‐digest restriction site‐associated DNA sequencing and geographic distribution information were used to investigate phylogeography and assess the environmental contribution to genetic variation. We found clear genetic differentiation between sister species, but a lack of genetic structure within species because of their long‐distance dispersal ability. The demographic model involved a scenario in which divergence in isolation (~0.6 Ma) was followed by secondary contact (~7 kya). The initial divergence may have been caused by the intensification of the East Asian monsoon during the Pleistocene climate oscillation. The historical demography indicated that the effective population size (Ne) showed an evident increase from 9 to 7 kya, which may be related to rice domestication and extensive human cultivation during the Holocene. We also detected a significant correlation between genetic and environmental distance, and the niche difference occupied between them. Temperature‐related variables were ranked as the main factors for the difference, and 410 selective SNPs involved in adaptation were identified. The Nanling Mountains in southern China serve as a geographical boundary between them and act as an ecological barrier belt that promotes local environmental adaptation. Our study demonstrates that historical climate change and local adaptation by climate‐imposed selection shape the phylogeographical patterns of sister species.
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来源期刊
Journal of Systematics and Evolution
Journal of Systematics and Evolution Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
7.40
自引率
8.10%
发文量
1368
审稿时长
6-12 weeks
期刊介绍: Journal of Systematics and Evolution (JSE, since 2008; formerly Acta Phytotaxonomica Sinica) is a plant-based international journal newly dedicated to the description and understanding of the biological diversity. It covers: description of new taxa, monographic revision, phylogenetics, molecular evolution and genome evolution, evolutionary developmental biology, evolutionary ecology, population biology, conservation biology, biogeography, paleobiology, evolutionary theories, and related subjects.
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