Origin and diversification of Indian Ceropegieae(Apocynaceae)and its possible relation to the Indian monsoon  

作　　者：Siddharthan Surveswaran Sharad S.Kambale Mansa Srivastav Sachin A.Punekar Shrirang R.Yadav K.Praveen Karanth 

机构地区：[1]Centre for Ecological Sciences,Indian Institute of Science,Bangalore,Karnataka 560012,India [2]Department of Botany,Shivaji University,Kolhapur,Maharashtra 416004,India [3]Department of Ecology and Evolutionary Biology,Yale University,165 Prospect St,New Haven,CT 06511,USA [4]Biospheres,Eshwari 52/403 Lakshmi Nagar,Parvati,Pune,Maharashtra 411009,India

出　　处：《Journal of Systematics and Evolution》2021年第1期93-112,共20页植物分类学报（英文版）

基　　金：SS thanks Science and Engineering Research Board(SERB),Department of Science and Technology,Government of India,for funding(SERC/LS-296/2011).SS thanks Council for Scientific and Industrial Research(CSIR),India,for Senior Research Associateship.

摘　　要：The Indian subcontinent has experienced a major shift in climatic regime from a wet tropical regime to increased seasonal rainfall,since the late Miocene.This shift has been attributed to the intensification of monsoons,which led to opening up of dry habitats in humid forests and formation of deciduous forests.We explored the role of this climatic shift in the origin and diversification of dry-adapted plant genera Ceropegia and Brachystelma(Ceropegiae,Asclepiadoideae,Apocynaceae).We sampled Ceropegia and Brachystelma from across India and used five markers(two nuclear and three plastid regions)to reconstruct a global phylogeny of this group.Indian members of the tribe Ceropegiae were derived from Africa through at least four independent dispersal events.All dispersal events occurred in late Miocene after establishment of a monsoon climate.One of these early dispersing lineages underwent rapid radiation in peninsular India,giving rise to around 50 species.Thus,both dispersal and diversification events coincided with the intensification of monsoons and concomitant aridification.The role of environment in the evolution of floral characteristics and root type in the Indian radiation is also discussed.This is one of the first reports on a dry-adapted endemic radiati on of plants in India.

关 键 词：BIOGEOGRAPHY Brachystelma Ceropegia DECCAN Eastern Ghats Indian subcontinent MONSOON Western Ghats 

分 类 号：Q941.1[生物学—植物学]