Identification of Barley mild mosaic virus Isolates in Germany Breaking rym5 Resistance* |
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| Authors: | A Habekuss T Kühne I Krämer F Rabenstein F Ehrig B Ruge‐Wehling W Huth F Ordon |
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| Institution: | 1. Authors’ addresses: 1Federal Centre for Breeding Research on Cultivated Plants, Institute of Epidemiology and Resistance Resources, Erwin‐Baur‐Str. 27, 06484 Quedlinburg, Germany;2. 2Institute of Resistance Research and Pathogen Diagnostics, Erwin‐Baur‐Str. 27, 06484 Quedlinburg, Germany;3. 3Institute of Agricultural Crops, Rudolf‐Schick‐Platz 3a, 18190 Gro? Lüsewitz, Germany;4. 4Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Virology, Microbiology and Biosafety, Messeweg 11/12, 38104 Braunschweig, Germany (correspondence to A. Habekuss. E‐mail: a.habekuss@bafz.de) |
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| 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, Rym14Hb, rym15 or Rym16Hb 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. |
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| Keywords: | Barleymild mosaic virus BaMMV resistance breaking isolate rym5 |
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