The obtained ITS (internal transcribed spacer) sequences of 3 species in Porites by PCR technique were analyzed by MEGA4.1 software to get base composition, G+C content and phylogenetic relationship with ITS gene of other 9 species uploaded to Genbank, The results showed that the ranges of ITS 1 and ITS2 of the tested 3 species were 205-209 bp and 197-226 bp, and the ranges of G+C content of ITS1 and ITS2 were 37.6%~45.5% and 45.1%~50.7%. The average genetic distance based on ITS1 and ITS2 were 0.097 and 0.200 respectively .The NJ-based phylogenetic tree based both ITS 1 and ITS2 shows that Porites nigrescens at the base of evolutionary tree, is a primitive group, Porites pukoensis is an evolutionary group and Porites lutea is a transitional group.%分别研究了徐闻3种滨珊瑚的ITS1和ITS2基因的碱基组成和G+C含量,并和已上传至Genbank上的其他9种滨珊瑚的ITS序列进行比较,研究了徐闻3种滨珊瑚的系统发生关系.序列分析结果显示,3种滨珊瑚的ITS1的长度为205 bp～209 bp,G+C含量为37.6％～45.5％,ITS2的长度为192 bp～226 bp,G+C含量为45.1％～50.7％,利用MEGA4.1软件计算滨珊瑚属基于ITS1和ITS2基因的平均遗传距离分别为0.097和0.200.基于ITS1和ITS2的NJ系统进化树都显示出,灰黑滨珊瑚位于进化树的基部,是原始的类群,普格滨珊瑚是进化类群,澄黄滨珊瑚是过渡类群.
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