| Molecular identification of bloom-forming species Phaeocystis globosa (Pryninesiophyta) and its dispersal based on rDNA ITS sequence analysis |
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| 作者姓名： | Chen Yueqin Shao Peng Wang Ning Zhou Hui Qu Lianghu Linda K. Medlin |
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| 作者单位： | Key Laboratory of Gene Engineering of Education Ministry, Biotechnology Research Center, Zhongshan University, Guangzhou 510275, China;Key Laboratory of Gene Engineering of Education Ministry, Biotechnology Research Center, Zhongshan University, Guangzhou 510275, China;Key Laboratory of Gene Engineering of Education Ministry, Biotechnology Research Center, Zhongshan University, Guangzhou 510275, China;Key Laboratory of Gene Engineering of Education Ministry, Biotechnology Research Center, Zhongshan University, Guangzhou 510275, China;Key Laboratory of Gene Engineering of Education Ministry, Biotechnology Research Center, Zhongshan University, Guangzhou 510275, China;Alfred Wegener Institute for Polar and Marine Research, Postfach 120161, Columbusstrasse, 27525 Bremerhaven, Germany |
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| 基金项目： | This study was supported by the National Natural Science Foundation of China under contract No. 39970063;the Natural Science Foundation of Guangdong Province, China under contract No. 001213;the Red-tide Key Project of the Natural Science Foundatio of Guangdong Province,China under contract No.011208,and by the DFG(SM 22/5-1). |
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| 摘 要： | The colony-forming Phaeocystis species are causative agents of dense bloom occurrences in coastal waters worldwide. It is difficult to separate them because of the different morphologies associated with their colonial stages. In this study we applied molecular approaches to analyze the genetic variation of Phaeocystis globosa and Phaeocystis pouchetii from several geographic regions, and to assist in tracing the dispersal of bloom-forming Phaeocystis species in coastal waters of China. The sequences of the internal transcribed spacers (ITS1 and ITS2) of rDNA and the 5.8S ribosomal RNA gene of Phaeocystis strains were determined. Sequence comparison shows that P.globosa was the most divergent to P. pouchetii, exhibiting sequence divergence higher than 0.08. However, lower genetic divergences existed between strains of P.globosa. The sequence comparison of the Phaeocystis rDNA ITS clearly shows that the species isolated from the southeast coast of China is identified as P.globosa rather than P. cf. pouchetii or other species. Furthermore, the significance of rDNA variation in distinct global populations of P.globosa suggested it might have had sufficient time to accumulate detectable mutations at the rDNA locus, supporting the hypothesis of ancient dispersal of P.globosa to many areas, meaning that P.globosa blooms in the coastal waters of China are endemic rather than a newly introduced species or a foreign source. Finally, based on the high divergent region of rDNA ITS, a pair of species-specific primers for P.globosa were designed, they could be useful to detect the presence of this species in mixed plankton assemblages or flagellate stages that are recognized with diffculties by means of conventional microscopy.
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| 关 键 词： | Genetic variation Phaeocystis globosa Phaeocystis pouchetii population dispersal rDNA ITS |
| 收稿时间： | 2002/11/25 0:00:00 |
| 修稿时间： | 2002/12/20 0:00:00 |
Molecular identification of bloom-forming species Phaeocystis globosa (Pryninesiophyta) and its dispersal based on rDNA ITS sequence analysis |
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| Chen Yueqin,Shao Peng,Wang Ning,Zhou Hui,Qu Lianghu,Linda K. Medlin.Molecular identification of bloom-forming species Phaeocystis globosa (Pryninesiophyta) and its dispersal based on rDNA ITS sequence analysis[J].Acta Oceanologica Sinica,2003,22(2):243-253. |
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| Authors: | Chen Yueqin Shao Peng Wang Ning Zhou Hui Qu Lianghu and Linda K Medlin |
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| Institution: | 1.Key Laboratory of Gene Engineering of Education Ministry, Biotechnology Research Center, Zhongshan University, Guangzhou 510275, China2.Alfred Wegener Institute for Polar and Marine Research, Postfach 120161, Columbusstrasse, 27525 Bremerhaven, Germany |
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| Abstract: | The colony-forming Phaeocystis species are causative agents of dense bloom occurrences in coastal waters worldwide. It is difficult to separate them because of the different morphologies associated with their colonial stages. In this study we applied molecular approaches to analyze the genetic variation of Phaeocystis globosa and Phaeocystis pouchetii from several geographic regions, and to assist in tracing the dispersal of bloom-forming Phaeocystis species in coastal waters of China. The sequences of the internal transcribed spacers (ITS1 and ITS2) of rDNA and the 5.8S ribosomal RNA gene of Phaeocystis strains were determined. Sequence comparison shows that P.globosa was the most divergent to P. pouchetii, exhibiting sequence divergence higher than 0.08. However, lower genetic divergences existed between strains of P.globosa. The sequence comparison of the Phaeocystis rDNA ITS clearly shows that the species isolated from the southeast coast of China is identified as P.globosa rather than P. cf. pouchetii or other species. Furthermore, the significance of rDNA variation in distinct global populations of P.globosa suggested it might have had sufficient time to accumulate detectable mutations at the rDNA locus, supporting the hypothesis of ancient dispersal of P.globosa to many areas, meaning that P.globosa blooms in the coastal waters of China are endemic rather than a newly introduced species or a foreign source. Finally, based on the high divergent region of rDNA ITS, a pair of species-specific primers for P.globosa were designed, they could be useful to detect the presence of this species in mixed plankton assemblages or flagellate stages that are recognized with diffculties by means of conventional microscopy. |
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| Keywords: | Genetic variation Phaeocystis globosa Phaeocystis pouchetii population dispersal rDNA ITS |
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