The purpose of this study is to analyze growth of A. ilicifolius seedling in response to salinities and its isoprenoid composition. The mangrove seedling were grown under different salinities for 5 mounth. The maximum growth of A. ilicifolius seedlings was in 0.5 % salinity and this elevation appeared to be attenuated by increasing of salinity. The results showed the composition of the isoprenoid in  A.ilicifolius  were consist of four phytosterols namely stigmasterol, campesterol, β-sitosterol, cycloartenol, and six triterpenoids : taraxerol, β-amyrin, germanicol, betulin, α-amyrin and lupeol. This research may provide information the characterization of triterpenoid and phytosterol of A. ilicfolius seedlings. Keywords : Mangrove, A.ilicifolius Linn, isoprenoid, and Salinity
                        
                        
                        
                        
                            
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