Extremely low genetic diversity and extensive genetic admixture at the northern range margins of Bombax ceiba》.pdf

Biochemical Systematics and Ecology 60 (2015) 177e185 Contents lists available at ScienceDirect Biochemical Systematics and Ecology journal homepage: /locate/biochemsyseco Extremely low genetic diversity and extensive genetic admixture at the northern range margins of Bombax ceiba a, 1 b, 1 a b c Seping Dai , Shuqiong Wang , Lin Ruan , Yubing Zhou , Wei Wu , Ying Liu b, Suhua Shi b, Renchao Zhou b, * a Guangzhou Institute of Landscape Gardening, Guangzhou 510405, China b State Key Laboratory of Biocontrol and Guangdong Key Laboratory of Plant Resources, Sun Yat-sen University, Guangzhou 510275, China c Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China a r t i c l e i n f o a b s t r a c t Article history: Understanding the evolutionary processes in species at the margins of their range is of Received 25 January 2015 great significance, because marginal populations may harbor local adaptations and will Accepted 24 April 2015 initiate further expansion in response to changes in the environment. Here we examined Available online 14 May 2015 genetic variation in two nuclear genes and one chloroplast intergenic spacer in 13 northern marginal populations and one geographically central population of Bombax ceiba, Keywords: