Miocene climatic fluctuations likely explain the species diversification of Lysionotus(Gesneriaceae)in Pan-Himalaya  

作　　者：Jie Huang Fabien L.Condamine Meng-Qi Han Lei Cai Khang Sinh Nguyen Chun-Yu Zou Wei-Bin Xu 

机构地区：[1]Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences,Guilin 541006,China [2]Institut des Sciences de l'Evolution de Montpellier,(Universitéde Montpellier|CNRS|IRD|EPHE),Place Eugène Bataillon,Montpellier 34095,France [3]State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [4]Yunnan Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations/Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China [5]Institute of Ecology and Biological Resources,Vietnam Academy of Science and Technology(VAST),Ha Noi 10072,Vietnam [6]Nonggang Karst Ecosystem Observation and Research Station of Guangxi,Chongzuo 532499,China

出　　处：《Journal of Systematics and Evolution》2025年第1期134-147,共14页植物分类学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(31860043);also in part by the scientific research capacity building project for the Nonggang Karst Ecosystem Observation and Research Station of Guangxi(GK23-026-273).

摘　　要：The Himalayas represent a complex mountain system housing some of the world's richest floras along with a high level of endemism.Among them,Lysionotus(Gesneriaceae)stands out as a small genus(~34 species)that is unexpectedly distributed across southern to eastern Asia.Within this genus,the mountain forests of the south Pan-Himalaya region emerge as a hotspot of diversity,hosting most epiphytic and endemic Lysionotus species.To explore the origin,evolutionary history and development of the current distribution pattern of Lysionotus,we inferred a highly resolved phylogenetic framework using 649 nuclear genes sourced from transcriptomes for 27 species.We revealed three major clades within Lysionotus with strong support,corresponding to the genus's classification into three sections(sects.Didymocarpoides,Lysionotus,and Cyathocalyx)based on morphological characters.Molecular dating suggests that Lysionotus is likely to have originated in the karst regions of northern Vietnam to southwestern China during the middle Oligocene(28.18 Ma),and then migrated westward to the southern Himalaya regions during the Miocene.The speciation rates of Lysionotus were likely to be positively linked to changes in East Asian monsoons and past temperatures.Notably,epiphytic species of sect.Lysionotus began colonizing the tropical and subtropical forests of the Pan-Himalaya around the mid-Miocene Climatic Optimum,coinciding with the transition to long seed appendages.Our findings support that the formation and development of forests in the southern Himalaya,along with paleo-climate changes and morphological innovations,which probably facilitated the evolution and expansion of the spatial distribution of Lysionotus.

关 键 词：BIOGEOGRAPHY Lysionotus morphology PHYLOGENOMICS transcriptome 

分 类 号：Q948[生物学—植物学]