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Identification of Fusarium solani as a causal agent of black spot disease (BSD) of Pacific white shrimp, Penaeus vannamei

文献类型： 外文期刊

作者： Yao, Liang 1 ; Wang, Chong 1 ; Li, Ge 1 ; Xie, Guosi 1 ; Jia, Yan 5 ; Wang, Wei 1 ; Liu, Shuang 1 ; Xu, Tingting 1 ; Luo, Kun 1 ; Zhang, Qingli 1 ; Kong, Jie 1 ;

作者机构： 1.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266071, Peoples R China

2.Minist Agr, Key Lab Maricultural Organism Dis Control, Qingdao 266071, Peoples R China

3.Qingdao Key Lab Mariculture Epidemiol & Biosecur, Qingdao 266071, Peoples R China

4.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

5.Shanghai Ocean Univ, Natl Demonstrat Ctr Expt Fisheries Sci Educ, Shanghai 201306, Peoples R China

6.Shanghai Ocean Univ, Natl Pathogen Collect Ctr Aquat Anim, Shanghai 201306, Peoples R China

7.Shanghai Ocean Univ, Int Res Ctr Marine Biosci, Minist Sci & Technol, Shanghai 201306, Peoples R China

关键词： Black spot disease (BSD); Pathogenicity; Fungi; Fusarium solani; Penaeus vannamei

期刊名称：AQUACULTURE （ 影响因子：5.135； 五年影响因子：5.125 ）

ISSN： 0044-8486

年卷期： 2022 年 548 卷

页码：

收录情况： SCI

摘要： In Nov 2020, mass mortality of cultured Pacific white shrimp (Penaeus vannamei) occurred due to black spot disease (BSD) in some shrimp farms in China. To investigate the disease cause, a potential pathogenic fungus was isolated from melanized lesions of P. vannamei suffering from the BSD syndrome. The fungal isolate was then identified as Fusarium solani based on TEFla and ITS-gene sequences. The isolate of fungus was used in infection studies. This study used Koch postulates confirmed that the studied agent was causing BSD symptoms in the white leg shrimp, which were significantly symptoms relieved after molting. Results showed that an identical fungus was re-isolated from black lesions after the artificial infection period. Virulence test revealed that F. solani could cause 88.66% mortality within 30 dpi at a dose of 1.02 x 10(6) CFU/mL, and the LC50 of F. solani at 30 dpi is 3.37 x 10(4) CFU/mL. The accumulative mortalities also displayed concentration dependence. The histopathological characterization displayed that responses of P. vannamei against F. solani are haemocytic infiltration, encapsulation, melanization, etc. in the black spot lesions. Furthermore, severe infection of F. solani in P. vannamei causes molting failure, and further contributes to the mortality of the diseased individuals. The findings of our study would be useful to provide a theoretical basis for early prevention and control of BSD.

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