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

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

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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 allo-polyploid species that can reproduce sexually and clonally reproduction,which explains the long-term adaptive potential of the species.

AcanthusAllopolyploidBiogeographyEvolutionHybridizationPolyploidy

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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State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources,School of Life Sciences,Sun Yat-sen University,Guangzhou 510275,Guangdong,China

Department of Bioengineering,Zhuhai Campus of Zunyi Medical University,Zhuhai 519041,Guangdong,China

China-ASEAN College of Marine Sciences,Xiamen University Malaysia,Sepang 43900,Selangor,Malaysia

School of Agriculture,Sun Yat-sen University,Shenzhen 518107,Guangdong China

School of Ecology,Sun Yat-sen University,Shenzhen 518107,Guangdong,China

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国家自然科学基金国家自然科学基金国家自然科学基金Guangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research FoundationForeign Cultural and Educational Experts Project of the Ministry of Science and Technology

3216005142076117417761662022A15150120152023A1515012772QNJ2021162001L

2024

10.1016/j.pld.2024.04.007

植物多样性(英文)
中国科学院昆明植物研究所，中国植物学会

植物多样性(英文)

CSTPCD
影响因子：0.617
ISSN：2096-2703
年,卷(期)：2024.46(4)