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Analysis of hybridization strains of Porphyra based on rbcL gene sequences

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Abstract

Two strains, which are the free-living conchocelis of Porphyra yezoensis Ueda and Porphyra haitanensis T. J. Chang et B. F. Zheng, and four “interspecific hybridization” strains of these two species are investigated. The rbcL genes of 11 samples were amplified and sequenced, each of which were about 1,400 bp with a good specificity. The results of pair-wise distance matrix and multi-alignment showed that pair-wise distance were small while homologous index was large between strains Y-2066, Y-k2001, and Y-H001. These two indexes showed the same level as the above between strains H-2001, Y-hyC1, and Y-hyC2; however, the distances were larger between three former strains and three latter strains. Cluster trees showed the same trend. Fertile strains appeared after 2 years of culture of unfertile interspecific hybridization conchocelis and were separated from that based on different colors. Our finding that these fertile strains can bear offspring is important for understanding the interspecies hybridization of Porphyra. Molecular analysis of the fertile strains based on rbcL gene showed maternal inheritance. We inferred that somatic recombination was one of the reasons making interspecific hybridization strains fertile.

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Acknowledgements

The study was funded by National High-tech Program of China (2006AA10A413) and High-tech Program of Jiangsu Province named “The selection and application of new germ plasm based on genetic recombination” (BE2009333).

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Correspondence to Pu Xu.

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Xu, P., Yang, L., Zhu, J. et al. Analysis of hybridization strains of Porphyra based on rbcL gene sequences. J Appl Phycol 23, 235–241 (2011). https://doi.org/10.1007/s10811-010-9537-3

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  • DOI: https://doi.org/10.1007/s10811-010-9537-3

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