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- W3142865144 abstract "The sequences of the ITS(internal transcribed spacer) and 5.8S rDNA of three cultivated strains of Porphyra haitanensis thalli(NB,PT and ST) were amplified,sequenced and analyzed.In addition,the phylogenic relationships of the sequences identified in this study with those of other Porphyra retrieved from GenBank were evaluated.The results are as follows:the sequences of the ITS and 5.8S rDNA were essentially identical among the three strains.The sequences of ITS1 were 331 bp to 334 bp,while those of the 5.8S rDNA were 158 bp and the sequences of ITS2 ranged from 673 bp to 681 bp.The sequences of the ITS had a high level of homology(up to 99.5%) with that of P.haitanensis(DQ662228) retrieved from GenBank,but were only approximately 50% homologous with those of other species of Porphyra.The results obtained when a phylogenetic tree was constructed coincided with the results of the homology analysis.These results suggest that the three cultivated strains of P.haitanensis evolved conservatively and that the ITS showed evolutionary consistency.However,the sequences of the ITS and 5.8S rDNA of different Porphyra species showed great variations.Therefore,the relationship of Porphyra interspecies phyletic evolution could be judged,which provides the proof for Porphyra identification study.However,proper classifications of the subspecies and the populations of Porphyra should be determined through the use of other molecular techniques to determine the genetic variability and rational phylogenetic relationships." @default.
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- W3142865144 date "2009-01-01" @default.
- W3142865144 modified "2023-09-23" @default.
- W3142865144 title "Sequence analysis of the ITS region and 5.8S rDNA of Porphyra haitanensis" @default.
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