Novel classification and biogeography of Leptolejeunea (Lejeuneaceae, Marchantiophyta) with implications for the origin and evolution of the Asian evergreen broad-leaved forests  

作　　者：Lei Shu Xin-Jje Jin Rui-Liang Zhu 

机构地区：[1]Bryology Laboratory,School of Life Sciences,East China Normal University,Shanghai 200241,China [2]Shanghai nstitute of Eco-Chongming(SIEC),Shanghai 200062,China [3]Tiantong National Station of Forest Ecosystem,Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration,East China Normal University,Shanghai 200241,China

出　　处：《Journal of Systematics and Evolution》2022年第5期1199-1217,共19页植物分类学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(Nos:31700169 and,31770224);Shanghai Sailing Program(No.17YF1404800);the Institute of Eco-Chongming(No.ECNU-IEC-201902).

摘　　要：Although recent molecular phylogenetic analyses have greatly improved our understanding of the classification of the large liverwort family Lejeuneaceae,the frequent incongruencies between morphology-based taxonomy and molecular phylogeny have hindered our understanding of evolutionary diversification within the group.Here we focus on Leptolejeunea(Spruce)Steph.,a pantropical epiphyllous genus in Lejeuneaceae with 40 species.Phylogenetic studies on the genus have been hampered by insufficient taxon sampling,leaving the deep phylogenetic relationships within this group unresolved.We present the most comprehensive phylogenetic analysis of the genus to date with sampling of over 80%of species,including the enigmatic Leptolejeunea spinistipula(Mizut.)X.L.He endemic to Borneo.Based on data from three molecular markers with representatives of Leptolejeunea and its allies,Leptolejeunea appeared to be monophyletic following the exclusion of L.spinistipula and its transfer to Soella R.L.Zhu,L.Shu,Qiong He&Y.M.Wei.A total-evidence approach was taken to resolve the backbone phylogeny of Leptolejeunea and a frst infrageneric classification of Leptolejeunea,including a new subgenus and three new sections,is proposed based on integrated molecular and morphological evidence.Reconstruction of the evolutionary history showed a wide ancestral area of Leptolejeunea during the Paleogene that arose in mainland Asia,followed by an accelerated speciation rate.Across the biogeographical history of Leptolejeunea,long-distance dispersal had profound effects on population expansion.Our findings suggest that Australasia is a source of biodiversity of Asian evergreen broad-leaved forests that have been established since the Oligocene and rose after the early Miocene.

关 键 词：ancestral state diversification rate molecular clock RASP Soell 

分 类 号：Q15[生物学—普通生物学]