Multiple Dataset-Based Insights into the Phylogeny and Phylogeography of the Genus Exbucklandia (Hamamelidaceae): Additional Evidence on the Evolutionary History of Tropical Plants
文献类型： 外文期刊
第一作者： Huang, Cuiying
作者： Huang, Cuiying;Fan, Qiang;Du, Heying;Jin, Jiehao;Chen, Sufang;Liao, Wenbo;Huang, Cuiying;Fan, Qiang;Du, Heying;Jin, Jiehao;Chen, Sufang;Liao, Wenbo;Xu, Kewang;Shi, Shi;Meng, Kaikai;Guo, Wei;Li, Hongwei
作者机构：
关键词： Exbucklandia; Hamamelidaceae; phylogeny; phylogeography
期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）
ISSN： 2223-7747
年卷期： 2025 年 14 卷 7 期
页码：
收录情况： SCI
摘要： Southeast Asia's biodiversity refugia, shaped by Neogene-Quaternary climatic shifts and the Tibetan Plateau uplift, preserve relict lineages like Exbucklandia (Hamamelidaceae). Once widespread across ancient continents, this genus now survives in Asian montane forests, offering insights into angiosperm diversification. Chloroplast haplotypes formed three clades-Clade I (E. tricuspis), Clade II (E. populnea), and Clade III (E. tonkinensis)-with E. longipetala haplotypes nested within II/III. Nuclear microsatellites (SSRs) identified two ancestral gene pools: E. populnea and E. tricuspis showed predominant ancestry in Pool A, while E. tonkinensis and E. longipetala were primarily assigned to Pool B. All taxa exhibited localized genetic admixture, particularly in sympatric zones. Divergence dating traced the genus' origin to tropical Asia, with northward colonization of subtropical China similar to 7 Ma yielding E. populnea and E. tonkinensis. Quaternary Glacial Cycles triggered southward expansions, chloroplast capture, and localized hybridization. Morphological, nuclear, and plastid molecular evidence supports reclassifying E. longipetala as E. populnea x E. tonkinensis hybrids lacking genetic cohesion and E. tricuspis as a distinct species with a mixed nuclear composition. This study highlights how paleoclimate-driven gene flow shaped the phylogeography of relict taxa in Southeast Asia and the urgency of habitat restoration to conserve Exbucklandia.
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