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Isolation and evaluation of a strain of Pyropia yezoensis (Bangiales, Rhodophyta) resistant to red rot disease

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Abstract

Red rot disease (Pythium porphyrae) resistant strains of Pyropia yezoensis, AP1 and AP2, were isolated from live cells taken from lesions on infected P. yezoensis blades. The degree of resistance of these strains to red rot disease was evaluated over a range of environmental conditions including temperature (10, 15, and 20 °C), salinity (20, 26, and 32 ppt), and pH (7.5, 8.0, and 8.5). These conditions are within the range that red rot disease naturally occurs on Pyropia blades. P. yezoensis and Pyropia suborbiculata with low and high partial resistance to red rot disease, respectively, were used as controls. Infection with red rot disease occurred under all environmental conditions. The incidence, severity, and expansion of the disease increased with increasing temperature and decreasing salinity and pH. The resistance of the strains P. yezoensis-AP1 and P. yezoensis-AP2 was higher than that of P. yezoensis, but lower than that of P. suborbiculata. The degree of resistance was not significantly different between the AP1 and AP2 strains. These strains can therefore be considered to exhibit stable partial resistance to P. porphyrae, and as a good starting point for the development of more resistant strains that will prevent or reduce the incidence of red rot disease on Pyropia farms.

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Acknowledgments

This research was partly supported by Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009–0093828), and NFRDI (RP-2013-AQ-157). The authors would like to thank Dr Philip Heath for reviewing the English language of this paper.

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Authors and Affiliations

  1. Department of Marine and Fisheries Resources, Mokpo National University, Jeonnam, 534-729, Republic of Korea

    Chan Sun Park

  2. Seaweed Research Center, National Fisheries Research and Development Institute, 130 Tongildaero, Mokpo, 530-831, Republic of Korea

    Eun Kyoung Hwang

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  1. Chan Sun Park
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  2. Eun Kyoung Hwang
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Correspondence to Eun Kyoung Hwang.

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Park, C.S., Hwang, E.K. Isolation and evaluation of a strain of Pyropia yezoensis (Bangiales, Rhodophyta) resistant to red rot disease. J Appl Phycol 26, 811–817 (2014). https://doi.org/10.1007/s10811-013-0183-4

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  • DOI: https://doi.org/10.1007/s10811-013-0183-4

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