转录组测序数据为了解泽米亚属(Zamia L.)(苏铁科:泽米亚属)的系统发育关系、生物地理学和网状进化提供了坚实的基础。

IF 3.6 2区 生物学 Q1 PLANT SCIENCES
Anders Lindstrom, Sadaf Habib, Shanshan Dong, Yiqing Gong, Jian Liu, Michael Calonje, Dennis Stevenson, Shouzhou Zhang
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引用次数: 0

摘要

背景和目的:苏铁是了解种子植物早期进化及其对过去环境变化反应的一个关键种系。方法:在此,我们利用 2,901 个单拷贝核基因,基于对 90% 现存 Zamia 物种的系统转录组分析,探索了苏铁类第二大属(即 Zamia)内的物种关系和基因流。在系统发生学框架的基础上,我们进行了基因流分析、分子年代测定和生物地理重建,以研究 Zamia 的时空演化。我们还对该属的总共 62 个性状进行了祖先状态重建(ASR),以全面研究其形态演化:Zamia 由七个主要支系组成,对应美洲七个不同的分布区,该属至少有三个网状结构节点。现存的 Zamia 支系最初在距今约 1840-3260 万年前(2914 万年前)的墨西哥巨型地区分化,然后向东扩展到加勒比海地区,并向南扩展到中美洲和南美洲。ASR 揭示了大部分形态特征的同源性:本研究通过比较方法/数据集揭示了一致的系统发生关系,其中一些冲突是不完全的世系分类和古代/新近杂交事件造成的。各支系与生物地理区域之间的密切联系表明,古代的扩散事件形成了现代的分布模式,而区域气候因素可能导致了随后的就地分化。中新世中期开始的气候变冷与苏铁植物向南美洲热带地区的全球扩展有关,这极大地推动了新世界植物区系的分化,同时化石记录也表明,苏铁物种在现今两个半球的较冷地区灭绝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transcriptome sequencing data provides a solid base to understand the phylogenetic relationships, biogeography and reticulated evolution of the genus Zamia L. (Cycadales: Zamiaceae).

Background and aims: Cycad is a key lineage to understand the early evolution of seed plants and their response to past environmental changes. However, tracing the evolutionary trajectory of cycad species is challenging when the robust relationships at inter- or infrageneric level are not well resolved.

Methods: Here, using 2,901 single-copy nuclear genes, we explored the species relationships and gene flow within the second largest genus of cycads, i.e., Zamia, based on phylotranscriptomic analyses of 90% extant Zamia species. Based on a well-resolved phylogenetic framework, we performed gene flow analyses, molecular dating, and biogeographical reconstruction to examine the spatiotemporal evolution of Zamia. We also performed ancestral state reconstruction (ASR) of a total of 62 traits of the genus to comprehensively investigate its morphological evolution.

Key results: Zamia is comprised of seven major clades corresponding to seven distinct distribution areas in the Americas, with at least three reticulation nodes revealed in this genus. Extant lineages of Zamia initially diversified around 18.4-32.6 (29.14) million years ago (MA) in the Mega-Mexico, and then expanded eastward into the Caribbean and southward into Central and South America. ASR revealed homoplasy in most of the morphological characters.

Conclusions: This study revealed congruent phylogenetic relationships from comparative methods/datasets, with some conflicts being the result of incomplete lineage sorting and ancient/recent hybridization events. The strong association between the clades and the biogeographic areas suggested that ancient dispersal events shaped the modern distribution pattern, and regional climatic factors may have resulted in the following in-situ diversification. Climate cooling starting during the mid Miocene is associated with the global expansion of Zamia to the tropical South America that have dramatically driven lineage diversification in the New World flora, as well as the extinction of cycad species in the nowadays cooler regions of both hemispheres as indicated by the fossil records.

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来源期刊
Annals of botany
Annals of botany 生物-植物科学
CiteScore
7.90
自引率
4.80%
发文量
138
审稿时长
3 months
期刊介绍: Annals of Botany is an international plant science journal publishing novel and rigorous research in all areas of plant science. It is published monthly in both electronic and printed forms with at least two extra issues each year that focus on a particular theme in plant biology. The Journal is managed by the Annals of Botany Company, a not-for-profit educational charity established to promote plant science worldwide. The Journal publishes original research papers, invited and submitted review articles, ''Research in Context'' expanding on original work, ''Botanical Briefings'' as short overviews of important topics, and ''Viewpoints'' giving opinions. All papers in each issue are summarized briefly in Content Snapshots , there are topical news items in the Plant Cuttings section and Book Reviews . A rigorous review process ensures that readers are exposed to genuine and novel advances across a wide spectrum of botanical knowledge. All papers aim to advance knowledge and make a difference to our understanding of plant science.
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