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Two independent double-stranded RNA patterns occur in the Finnish Gremmeniella abietina var. abietina type A

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The occurrence of double-stranded RNA (dsRNA) among isolates of var. type A was studied. Nine out of the 17 isolates investigated contained dsRNA, but none of them was of ascospore origin. Two fairly different dsRNA patterns were found and they occurred independently of each other. The first was composed of a single approximately 6000 bp long dsRNA molecule. The second was a multisegmented dsRNA pattern composed of three dsRNA molecules with apparent sizes of 1800 1600 and 1200 bp, respectively. In pathogenicity experiments no major differences were observed between dsRNA-containing and dsRNA-free isolates.


Deux profils indépendants d'ARN doubles brins sont présents chez le Gremmeniella abietina var. abietina de type A de Finlande

L'existence d'ARN doubles brins (dsRNA) a étéétudiée chez des isolats finlandais de Gremmeniella abietina var. abietina de type A. Parmi dix-sept isolats examinés, neuf contenaient un dsRNA, mais aucun d'entre eux n'était d'origine ascosporée. Deux profils nettement différents de dsRNA ont été trouvés, indépendants l'un de l'autre. Le premier était constitué d'une molécule unique d'environ 6000 pb. Le second présentait un profil en plusiers fragments de tailles apparentes de 1800, 1600 et 1200 pb respectivement. En test de pouvoir pathogène, nous n'avons pas observé de différence notable entre les isolats contenant ou pas d'ARN doubles brins.

Document Type: Research Article


Affiliations: 1: Finnish Forest Research Institute, Vantaa Research Centre, PO Box 18, FIN-01301 Vantaa, Finland; 2: The University of Helsinki, Hyytiälä Forestry Field Station, Hyytiäläntie 124, FIN-35500 Korkeakoski, Finland

Publication date: 2002-08-01

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