中文摘要：

运用PCR产物直接测序法测定了红树科（Rhizophoraceae）角果木属（Ceriops）5个物种24个个体加上外类群木榄共125个序列,包括rpl20-rps12,atpB-rbcL,trnL intron,trnL-trnF,trnT（UGU）-trnL（UAA）共5段叶绿体非编码区,序列总长度为2716 bp。基于以上合并序列,采用最大简约法、贝叶斯法和邻接法所构建的系统发育树呈现出高度一致的系统发育关系,结果显示：角果木属包含两个大的分支：（1）角果木C.tagal和澳洲角果木C.australis构成一个分支;（2）十雄角果木复合体内的3个物种（十雄角果木C.decandra、齐氏角果木C.zippeliana和拟十雄角果木C.pseudodecandra）组成另一分支,其中齐氏角果木和拟十雄角果木为姊妹种,该分支3个物种相互之间的遗传距离均显著大于传统物种角果木和澳洲角果木之间的遗传距离,并且每个物种的单系性在系统树上均得到强烈支持。研究结果支持了Sheue在最近研究中关于该属物种地位的处理,进一步探讨了角果木属系统发育关系与该属生物地理分布模式之间的相关性。

英文摘要：

Five non-coding regions of chloroplast, including rpl20-rps12, atpB-rbcL, trnL intron, trnL-trnF and trnT（ UGU）-trnL（ UAA）, from 24 individuals of five species in Ceriops and one outgroup species Bruguiera gymnorrhiza in Rhizophoraceae were determined by sequencing their PCR products directly. All 125 sequences of the five non-coding regions from different species were aligned and resulted in 2716 bp. The maximum parsimony, Bayesian inference and neighbor-joining methods were adopted to reconstruct molecular phylogeny of Ceriops based on the combined sequences,respectively. All phylogenetic trees showed consistent topology which revealed two clades in Ceriops,including one clade consisting of C. tagal and C. australis, and the other clade corresponding to C. decandra complex（ C. decandra, C.pseudodecandra and C. zippeliana）. The pairwise genetic distances among species of C. decandra complex were significantly higher than those between two well-recognized species C. tagal and C. australis. And the monophyly of different species and the sistership of C. pseudodecandra and C. zippeliana were well supported. Our result supported Sheue＇s recent studies on the treatment of these species status in Ceriops. The article further discussed the association between the molecular phylogeny and the biogeographical model in Ceriops.