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

作　　者：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 

机构地区：[1]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 [2]Department of Bioengineering,Zhuhai Campus of Zunyi Medical University,Zhuhai 519041,Guangdong,China [3]China-ASEAN College of Marine Sciences,Xiamen University Malaysia,Sepang 43900,Selangor,Malaysia [4]School of Agriculture,Sun Yat-sen University,Shenzhen 518107,Guangdong,China [5]School of Ecology,Sun Yat-sen University,Shenzhen 518107,Guangdong,China

出　　处：《Plant Diversity》2024年第4期476-490,共15页植物多样性（英文版）

基　　金：supported by grants from the National Natural Science Foundation of China (Grant Nos.32160051,42076117,and 41776166);Guangdong Basic and Applied Basic Research Foundation (Grant Nos.2022A1515012015,2023A1515012772);the Foreign Cultural and Educational Experts Project of the Ministry of Science and Technology (No.QNJ2021162001L)。

摘　　要：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 truemangrove 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.

关 键 词：Acanthus ALLOPOLYPLOID BIOGEOGRAPHY EVOLUTION HYBRIDIZATION POLYPLOIDY 

分 类 号：Q941[生物学—植物学]