Abstract:Sonneratia caseolaris is a mangrove species belonging to Sonneratiaceae. The natural distribution in China restricted to Hainan Island. Sample leaves were collected from individuals of three natural S. caseolaris populations of Wanning (WN), Qionghai (QH) and Hengshan (HS) and one population at Dongzhai Harbor (DZG) introduced from nearby area. A total of eighty-six individuals were sampled. Eleven ISSR primers gave rise to 239 discernible DNA fragments of which 194 (81.17%) were polymorphic. The percentage...