Journal of Phytopathology (2008) 156, 36-41

A. Habekuss, T. Kühne, I. Krämer, F. Rabenstein, F. Ehrig, B. Ruge-Wehling, W. Huth and F. Ordon (2008)
Identification of Barley mild mosaic virus isolates in Germany breaking rym5 resistance
Journal of Phytopathology 156 (1), 36-41
Abstract: In winter and early spring 2004 unequivocal mosaic symptoms were detected for the first time in Germany on six plants of the barley cv. 'Tokyo' carrying the resistance gene rym5. By serological and electron microscopic investigations Barley mild mosaic virus (BaMMV) was identified in all plants and could be re-transmitted to cv. 'Tokyo' as well as to additional cultivars carrying rym5. In contrast to this, genotypes carrying the resistance genes rym1 + rym5, Rym2, rym4, rym7, rym9, rym11, rym12, rym13, Rym14^Hb, rym15 or Rym16^Hb turned out to be resistant. Furthermore, the BaMMV isolates were not transmissible to different dicotyledonous species. Sequence analyses in the VPg coding region of RNA1 revealed differences to the known sequence of the original BaMMV isolate (BaMMV-ASL1, AJ 242725) and also of a French pathotype (BaMMV-Sil, AJ 544267, AJ 544268) which is also able to overcome the resistance mediated by rym5. At least in one location a spread of the area infested by this new strain was observed in 2004/2005 and 2005/2006.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Antje Habekuss, Frank Ordon, Brigitte Ruge-Wehling, Winfried Huth

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Barley mild mosaic virus	Barley (Hordeum vulgare)	Germany