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Development of an Efficient Mechanical Inoculation Technique to Screen Barley Genotypes for Resistance to Barley mild mosaic virus Disease and its Comparison to Natural Infection

  • Jonson, Gilda (Honam Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Park, Jong-Chul (Honam Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Noh, Tae-Hwan (Honam Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Mi-Jung (Honam Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Hyun, Jong-Nae (Honam Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Jong-Gon (Honam Agricultural Research Institute, National Institute of Crop Science, RDA)
  • Published : 2006.12.01

Abstract

Barley mild mosaic virus(BaMMV) is a soilborne Bymovirus vectored by root-infecting fungus, Polymyxa graminis. Mechanism of cultivar's resistance to BaMMV in field tests are difficult to assess since resistance could be either due to the virus or to P. graminis, or both. Whereas, available mechanical inoculation methods for BaMMV and other related viruses are labor intensive, give inconsistent results and generally result in low infection rates. Inoculation method using stick with gauze(SWG) was developed for BaMMV. The improved method proved to be simple, efficient, and reliable. The infected leaf tissues were preserved by drying in a frozen state under high vaccum(freeze dried barley infected leaves) to circumvent reduction of virus infectivity during storage. Five Korean barley cultivars were mechanically inoculated with BaMMV-infected sap by the improved method. Infection rates obtained were compared with natural infection. Cultivar Naehanssalbori showed resistance to BaMMV in the field trials but was found highly susceptible in the greenhouse tests by mechanical inoculation, indicating that the field resistance may be possibly due to resistance to P. graminis.

Keywords

References

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  1. Responses of Resistant Genes to Barley Yellow Mosaic Virus (BaYMV) Strains in Korea vol.15, pp.2, 2009, https://doi.org/10.5423/RPD.2009.15.2.072