Origin and evolution of a new tetraploid mangrove species in an intertidal zone.

IF 4.6 1区 生物学 Q1 PLANT SCIENCES Plant Diversity Pub Date : 2024-04-26 eCollection Date: 2024-07-01 DOI:10.1016/j.pld.2024.04.007
Hui Feng, Achyut Kumar Banerjee, Wuxia Guo, Yang Yuan, Fuyuan Duan, Wei Lun Ng, Xuming Zhao, Yuting Liu, Chunmei Li, Ying Liu, Linfeng Li, Yelin Huang
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Abstract

Polyploidy is a major factor in the evolution of plants, yet we know little about the origin and evolution of polyploidy in intertidal species. This study aimed to identify the evolutionary transitions in three true-mangrove species of the genus Acanthus distributed in the Indo-West Pacific region. For this purpose, we took an integrative approach that combined data on morphology, cytology, climatic niche, phylogeny, and biogeography of 493 samples from 42 geographic sites. Our results show that the Acanthus ilicifolius lineage distributed east of the Thai-Malay Peninsula possesses a tetraploid karyotype, which is morphologically distinct from that of the lineage on the west side. The haplotype networks and phylogenetic trees for the chloroplast genome and eight nuclear genes reveal that the tetraploid species has two sub-genomes, one each from A. ilicifolius and A . ebracteatus, the paternal and maternal parents, respectively. Population structure analysis also supports the hybrid speciation history of the new tetraploid species. The two sub-genomes of the tetraploid species diverged from their diploid progenitors during the Pleistocene. Environmental niche models revealed that the tetraploid species not only occupied the near-entire niche space of the diploids, but also expanded into novel environments. Our findings suggest that A. ilicifolius species distributed on the east side of the Thai-Malay Peninsula should be regarded as a new species, A. tetraploideus, which originated from hybridization between A. ilicifolius and A. ebracteatus, followed by chromosome doubling. This is the first report of a true-mangrove allopolyploid species that can reproduce sexually and clonally reproduction, which explains the long-term adaptive potential of the species.

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潮间带四倍体红树林新物种的起源与进化。
多倍体是植物进化的一个重要因素,但我们对潮间带物种多倍体的起源和进化知之甚少。本研究旨在确定分布在印度-西太平洋地区的三个真红树属物种的进化转变。为此,我们采用了一种综合方法,结合了来自 42 个地理位置的 493 个样本的形态学、细胞学、气候生态位、系统发育和生物地理学数据。结果表明,分布在泰国-马来半岛以东的Acanthus ilicifolius品系具有四倍体核型,在形态上与西侧的品系截然不同。叶绿体基因组和八个核基因的单倍型网络和系统发生树显示,该四倍体物种有两个亚基因组,分别来自父本 A. ilicifolius 和母本 A. ebracteatus。种群结构分析也支持四倍体新物种的杂交分化历史。四倍体物种的两个亚基因组是在更新世期间从它们的二倍体祖先分化而来的。环境生态位模型显示,四倍体物种不仅占据了二倍体近乎完整的生态位空间,而且还扩展到了新的环境中。我们的研究结果表明,分布在泰国-马来半岛东侧的A. ilicifolius物种应被视为一个新物种,即A. tetraploideus,它起源于A. ilicifolius和A. ebracteatus的杂交,随后染色体加倍。这是首次报道能进行有性繁殖和克隆繁殖的真红树异源多倍体物种,这解释了该物种的长期适应潜力。
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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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