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Characterization of Pythium chondricola associated with red rot disease of Pyropia yezoensis (Ueda)(Bangiales,Rhodophyta) from Lianyungang,China

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Journal of Oceanology and Limnology 2019年第3期37卷 1102-1112页

作者： QIU Liping MAO Yunxiang TANG Lei TANG Xianghai MO Zhaolan Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyKey Laboratory of Marine Genetics and Breeding (Ocean University of China)Ministry of EducationQingdao 266003China Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyKey Laboratory of Maricultural Organism Disease ControlMinistry of Agriculture and Rural AffairsQingdao Key Laboratory of MaricultureEpidemiology and BiosecurityYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China

Pyropia yezoensis(formerly Porphyra yezoensis)is an economically important red alga that is cultured extensively in *** red rot disease occurs commonly during Pyropia cultivation,causing serious economic *** incidence of red rot disease was found in a *** farm from mid-November to mid-December 2015 at Lianyungang,Jiangsu Province,*** examination revealed that the naturally infected thalli were infected apparently by a pathogen,leading to red rot *** causative agent was isolated and identified as the oomycete Pythium chondricola by morphological analysis and sequence analysis of the internal transcribed spacer and cytochrome oxidase subunit 1(cox 1).In artifi cial infection experiments on the *** blades,the *** isolate was able to cause the same characteristic histopathology seen in natural *** grew well at a wide range of temperatures in the range 8-31℃,salinities at 0-45 and pH *** an orthogonal test used to determine the effects of environmental factors(temperature,salinity,and zoospore concentration)on infection,the data revealed that temperature was the most important factor to affect red rot disease development,with the optimal conditions for disease expansion being 20℃,35 salinity,and a zoospore concentration of 10^6 zoospores/*** results obtained from the present study prompted us to set up a comprehensive epidemiological study on Pyropia,which will provide support to maintain the healthy development of the Pyropia industry in China.

关键词： Pyropia yezoensis red rot identification Pythium chondricola pathogenicity disease expansion

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