关键词: 坛紫菜, 生理性病变, 症状, Porphyra haitanensis, physiological disorders, symptom

Abstract: The rotten disease of Porphyra haitanensis from Fuding Xiamen Bay was investigated in this paper,the samples was collected and took back to culture in laboratory, and then the occurrence and development process of physiological disorder were studied by using microscopy methods. The main symptoms of this disease were faded, pale and then completely rotten in tip part of thallus. No obvious lesions rotten hole was found. Main pathologic symptoms included, in tip part of thallus, cell edge blurred, pigment body color changed and then developed into cell edge disorder, cytolysis, protoplasm outflow, abnormal cellular structure.The severe lesions could easily cause secondary infection by bacteria and protozoa, resulting in ulceration of the thallus, and finally caused the thallus dissociated completely. Rainy weather could easily lead to this disease to break out. Cutting rotten parts of the thallus and extending the drying time in sunny day were the key measures to control this disease.