Is Aphanomyces astaci Losing its Stamina: A Latent Crayfish Plague Disease Agent From Lake Venesjärvi, Finland

IF 0.8 Q4 MARINE & FRESHWATER BIOLOGY Freshwater Crayfish Pub Date : 2020-12-31 DOI:10.5869/fc.2021.v26-2.139
J. Jussila, Caterina Francesconi, K. Theissinger, H. Kokko, Jenny Makkonen
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引用次数: 4

Abstract

The crayfish plague disease agent, Aphanomyces astaci, has coevolved with the native European crayfish since its arrival to mainland Europe in the 1860s. There are indications that some of the A. astaci strains are of reduced virulence, while the resistance against A. astaci infection varies among native European crayfish stocks. In Lake Venesjärvi, Finland, a potential case of latent crayfish plague infection was observed in the early 2000s. We have isolated an oomycete from live Astacus astacus originating from Lake Venesjärvi and identified it as A. a staci of haplogroup A by specific qPCR, nuclear ITS and mitochondrial LSU and SSU sequencies, and named the isolate as UEF_VEN5/14. The A. astaci was isolated from a potentially latently infected A. astacus, subsequently identified, genotyped and proven to be of reduced virulence in a separate infection challenge experiment under laboratory conditions. These findings add to speculations of rather rapid coevolution of A. astaci and European native crayfish and support the reports on latent crayfish plague infections among wild native European crayfish.
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astaci Aphanomyces正在失去耐力吗:一种来自芬兰Venesjärvi湖的潜在小龙虾瘟疫病原体
自19世纪60年代小龙虾抵达欧洲大陆以来,小龙虾瘟疫病原体阿氏无头菌与欧洲本土小龙虾共同进化。有迹象表明,一些astaci菌株的毒力降低,而对astaci感染的抵抗力在欧洲本土小龙虾种群中各不相同。在芬兰的Venesjärvi湖,2000年代初观察到一例潜在的小龙虾瘟疫感染病例。我们从来自Venesjärvi湖的Astacus Astacus活体中分离出一株卵菌,并通过特异性qPCR、核ITS和线粒体LSU和SSU序列将其鉴定为单倍群A的一个staci。该A.astaci是从一种潜在潜伏感染的A.astacus中分离出来的,随后在实验室条件下的单独感染激发实验中进行了鉴定、基因分型并证明其毒力降低。这些发现增加了对A.astaci和欧洲本土小龙虾快速共同进化的猜测,并支持了关于野生本土欧洲小龙虾中潜在小龙虾瘟疫感染的报道。
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Freshwater Crayfish
Freshwater Crayfish MARINE & FRESHWATER BIOLOGY-
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2.70
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