Evolution of the platycodonoid group with particular references to biogeography and character evolution  

作　　者：Qiang Wang Xiao-Quan Wang Hang Sun Yan Yu Xing-Jin He De-Yuan Hong 

机构地区：[1]State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, the Chinese Academy of Sciences [2]Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, the Chinese Academy of Sciences [3]College of Life Sciences, Sichuan University

出　　处：《Journal of Integrative Plant Biology》2014年第10期995-1008,共14页植物学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (31170175; 31110103911);the National Science Infrastructure Platform Foundation of China (2013FY112100)

摘　　要：The Qinghai‐Tibet Plateau（QTP）is an important center of origin and diversification for many northern temperate plants.The hypothesis＂out‐of‐QTP＂suggests that the majority of northern temperate plants have originated and dispersed from the QTP and adjacent regions.An interesting question is whether the biogeographic history of the platycodonoids（Campanulaceae）,a group mainly distributed in the QTP and adjacent regions,coincides with the hypothesis＂out‐of‐QTP＂？Furthermore,how have the diagnostic characters of the platycodonoids evolved？In the present study,all 10genera of the platycodonoids were sampled for molecular phylogeny and dating analyses,and ancestral states of distribution and characters were reconstructed.The results do not support the platycodonoids as an＂out‐of‐QTP＂group,but instead they might have descended from Tethyan ancestors.The dispersal and diversification of the platycodonoids in Asia might have been driven by the uplift of the QTP.The present study highlights the importance of the Tethyan Tertiary flora for the origin of the Sino‐Himalayan flora and the influence of the uplift of QTP on diversification of northern temperate plants.In addition,character state reconstruction reveals that the inferior ovary,capsule,long‐colpate pollen,and chromosome number 2n=14 are probably ancestral states.The Qinghai‐Tibet Plateau（QTP）is an important center of origin and diversification for many northern temperate plants.The hypothesis＂out‐of‐QTP＂suggests that the majority of northern temperate plants have originated and dispersed from the QTP and adjacent regions.An interesting question is whether the biogeographic history of the platycodonoids（Campanulaceae）,a group mainly distributed in the QTP and adjacent regions,coincides with the hypothesis＂out‐of‐QTP＂？Furthermore,how have the diagnostic characters of the platycodonoids evolved？In the present study,all 10genera of the platycodonoids were sampled for molecular phylogeny and dating analyses,and ancestral states of distribution and characters were reconstructed.The results do not support the platycodonoids as an＂out‐of‐QTP＂group,but instead they might have descended from Tethyan ancestors.The dispersal and diversification of the platycodonoids in Asia might have been driven by the uplift of the QTP.The present study highlights the importance of the Tethyan Tertiary flora for the origin of the Sino‐Himalayan flora and the influence of the uplift of QTP on diversification of northern temperate plants.In addition,character state reconstruction reveals that the inferior ovary,capsule,long‐colpate pollen,and chromosome number 2n=14 are probably ancestral states.

关 键 词：BIOGEOGRAPHY CAMPANULACEAE character evolution platycodonoids Qinghai‐Tibet Plateau 

分 类 号：Q948[生物学—植物学]