Species identity and phylogenetic relationship of the pearl oysters in Pinctada Roding, 1798 based on ITS sequence analysis

文献类型： 外文期刊

第一作者： Yu, DH

作者： Yu, DH;Chu, KH

作者机构：

关键词： internal transcribed spacer;Pinctada;species identity;phylogeny

期刊名称：BIOCHEMICAL SYSTEMATICS AND ECOLOGY （ 影响因子：1.381； 五年影响因子：1.351 ）

ISSN： 0305-1978

年卷期： 2006 年 34 卷 3 期

页码：

收录情况： SCI

摘要： Analysis of ITS 1 and ITS 2 sequences in the pearl oysters Pinctada albina, Pinctada chemnitzi, Pinctada fucata, Pinctada fucata martensii, Pinctada imbricata, Pinctada margaritifera, Pinctada maxima, Pinctada nigra and Pinctada radiata was carried out. Homogeneity test of substitution patterns suggests that GC contents are highest in P. margaritifera and P. maxima and chromosomal rearrangements occurred in P. chemnitzi. These observations indicate that P. margaritifera and P. maxima are primitive species and P. chemnitzi is a recent species. Phylogenetic analysis shows that the pearl oysters studied constitute three clades with P. margaritifera and P. maxima forming the basal clade, congruent with results revealed by the substitution pattern test. The second clade consists of P. fucata, P. fucata martensii and P. imbricata. Low genetic distances among these taxa indicate that they may be conspecific. The remaining species make up the third clade and low genetic divergence between P. albina and P. nigra suggests that they may represent the same species. The ITS 1 sequence of P. radiata in GenBank is almost identical to that of P. chemnitzi determined in the present study and we suspect that the specimen used for the P. radiata sequence was misidentified. (c) 2005 Elsevier Ltd. All rights reserved.

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