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Characterization of a novel fungal disease that infects the gametophyte of Pyropia yezoensis (Bangiales, Rhodophyta)

文献类型： 外文期刊

作者： Mo, Zhaolan 2 ; Li, Shufen 1 ; Kong, Fanna 1 ; Tang, Xianghai 1 ; Mao, Yunxiang 1 ;

作者机构： 1.Ocean Univ China, Coll Marine Life Sci, Key Lab Marine Genet & Breeding, Qingdao 266003, Shandong, Peoples R China

2.Chinese Acad Fishery Sci, Key Lab Sustainable Dev Marine Fisheries, Minist Agr, Yellow Sea Fisheries Res Inst, Qingdao 266071, Shandong, Peoples R China

3.Natl Lab Marine Sci & Technol, Qingdao 266200, Shandong, Peoples R China

关键词： Pyropia yezoensis;Rhodophyta red rot disease;Alternaria sp

期刊名称：JOURNAL OF APPLIED PHYCOLOGY （ 影响因子：3.215； 五年影响因子：3.612 ）

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收录情况： SCI

摘要： This study investigated a new fungal disease that attacks Pyropia yezoensis, an economically important red alga that is extensively cultured in China. An incidence was found in a P. yezoensis farm during mid to end November 2012 at Haizhou Bay, Jiangshu Province, China. Histopathology revealed that the naturally infected thalli were overwhelmed by a fungus, leading to progressive red rot symptoms. The causative agent was isolated, grown in pure culture, and identified as a member of the genus Alternaria by morphology and sequence analysis of the nuclear ribosomal DNA containing the internal transcribed spacer (ITS) region of ITS1 and ITS2. In artificial infection experiments on P. yezoensis blades, the fungal isolate was able to cause the same characteristic histopathology seen in natural infections. This fungal isolate grew well at a wide range of temperatures (8-36 A degrees C) and at low salinities (5-50 aEuro degrees). In an orthogonal test used to determine the effects of environmental factors (temperature, salinity, and conidia concentration) on disease expansion, it was found that higher temperatures and lower salinities easily caused red rot disease, with the optimal conditions for disease development being 23 A degrees C, 24 aEuro degrees salinity, and a conidia concentration of 10(5) mL(-1). This is the first report to show that Alternaria causes red rot disease in P. yezoensis.

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