植物学报2025，Vol.60Issue(4)：562-572,11.DOI:10.11983/CBB24149
十大功劳属(小檗科)叶结构分型新体系
New Leaf Architecture Classification of Mahonia(Berberidaceae)
摘要
Abstract
INTRODUCTION:Mahonia(Berberidaceae),a basal eudicot lineage,ranks as the second largest genus in the family,comprising approximately 100 species distributed across subtropical to temperate regions of East Asia and North Ameri-ca.The genus exhibits a classic East Asia-Western North America(EA/WNA)disjunction.Notably,Mahonia preserves abundant leaf fossil records in Cenozoic strata of the Northern Hemisphere,reflecting its prolonged evolutionary history.Characterized by distinctive foliar architecture that differs markedly from other angiosperm groups,this genus holds sig-nificant potential as a invaluable biological proxy or model plant for investigating the formation of intercontinental disjunct distribution patterns.Its unique morphological traits and biogeographic history provide critical opportunities to trace ge-nus-level morphological evolution and spatio-temporal dynamics against the backdrop of global tectonic movements and climatic shifts. RATIONALE:Through comprehensive morphological surveys of extant Mahonia species,we established a novel leaf architecture classification framework designed for application to fossil leaf typology.This system aims to elucidate the genus'foliar evolutionary trajectory since the Cenozoic and unravel the historical processes underlying its intercontinental disjunct distribution. RESULTS:Traditionally taxonomist divides Mahonia into two groups based on venation patterns:the palmately veined Group Orientales and the pinnately veined Group Occidentales.Building upon previous studies,we analyzed leaf archi-tecture across 46 extant species and developed a refined subclade classification system using four diagnostic traits:leaflet margin type,serration density(teeth per edge),serration height,and leaflet length-to-width ratio.The Group Ori-ental was subdivided into seven foliar types(Microphylla,Japonica,Cardiophylla,Bodinieri,Polyodonta,Fortunei,and Nervosa),while the Occidental clade yielded six types(Chochoco,Dictyota,Volcania,Pumila,Lanceolata,and Aqui-folium),accompanied by a diagnostic key.Distributional analyses revealed that within Group Orientales,geographic range expands with increasing serration height,whereas in Group Occidentales,distribution range correlates positively with serration density.The framework's utility was further validated through taxonomic reclassification of two disputed fossil specimens,demonstrating its applicability to paleobotanical studies. CONCLUSION:Our refined foliar classification system for Mahonia represents a significant advancement in precision and granularity over previous systems.This framework holds substantial promise for standardizing Cenozoic leaf fossil ty-pology across the Northern Hemisphere,while providing critical insights into the genus'foliar evolution and the historical assembly of its intercontinental disjunct distribution pattern.关键词
十大功劳属/叶结构/分型/形态演化/东亚-北美间断分布Key words
Mahonia/leaf architecture/classification/morphological evolution/East Asia-North America disjunction引用本文复制引用
赵白龙,李业亮,王宇飞,孙斌..十大功劳属(小檗科)叶结构分型新体系[J].植物学报,2025,60(4):562-572,11.基金项目
国家自然科学基金(No.31970233,No.32000174)、中国科学院重点研发计划(No.XDB26000000)和中国科学院战略生物资源计划 （No.31970233,No.32000174）
