Prevalence of a single fish-pathogenic Saprolegnia sp. clone in Finland and Sweden.
Thirty-one isolates of Saprolegnia sp., most originating from infected salmon or trout, were characterised genetically and physiologically. The majority (6 of 31) of the isolates from several widely separated geographical locations was found to be genetically almost identical as assessed by RAPD-PCR. The remaining isolates belonged to 3 different groups with 1 to 3 representatives each. It is suggested that the first group of isolates represents a virulent form of the organism that has been widely spread by clonal propagation. The ability to repeated zoospore emergence, as an alternative to direct germination, seems to characterise specific Saprolegnia genotypes that may have adapted to certain hosts.
Bangyeekhun
Eakaphun
E
Department of Comparative Physiology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18A, 752 36 Uppsala, Sweden.
Pylkkö
Päivi
P
Vennerström
Pia
P
Kuronen
Henry
H
Cerenius
Lage
L
D000818:Animals; D004247:DNA / Q000032:analysis; D005387:Finland / Q000453:epidemiology; D005393:Fish Diseases / Q000453:epidemiology / Q000382:microbiology*; D009868:Oomycetes / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity*; D010802:Phylogeny; D015995:Prevalence; D019105:Random Amplified Polymorphic DNA Technique / Q000379:methods / Q000662:veterinary; D012474:Salmon / Q000382:microbiology*; D013548:Sweden / Q000453:epidemiology; D014337:Trout / Q000382:microbiology*; D014774:Virulence
D004247:DNA