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Evaluation and Verification of Barley Genotypes with Known Genes for Resistance to Barley yellow mosaic virus and Barley mild mosaic virus Under Field Conditions in South Korea

  • Kim, Hong-Sik (International Technology Cooperation Center, Rural Development Administration) ;
  • Baek, Seong-Bum (Upland Crop Division, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Dea-Wook (Upland Crop Division, National Institute of Crop Science, Rural Development Administration) ;
  • Hwang, Jong-Jin (Upland Crop Division, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Si-Ju (Upland Crop Division, National Institute of Crop Science, Rural Development Administration)
  • Received : 2011.09.08
  • Accepted : 2011.10.28
  • Published : 2011.12.01

Abstract

Soil-borne barley yellow mosaic disease caused by Barley yellow mosaic virus (BaYMV) or Barley mild mosaic virus (BaMMV) gives a serious threat to the winter barley cultivated in the southern regions in Korea. It is important to develop resistant varieties for stable and high-yield production. The objectives of this study were to evaluate 22 genotypes of exotic barley germplasms carrying the resistance genes rym1 through rym12, with the exception of rym10, and to determine the genes that confer resistance to BaYMV or BaMMV in Korea. Using the traditional visual scoring of symptoms at 4 locations over 3 years, average disease rate values differed (P < 0.001) among the genotypes. ELISA test revealed the presence of both BaYMV and BaMMV in all of the field sites but Jinju and significantly different rates of infection among genotypes and years. Barley genotypes differed in how virus quantities and pathogen-induced symptoms were correlated, especially in response to BaYMV. Disease incidence was affected by the climatic conditions present during the early growing stage before overwintering. A Chinese landrace, 'Mokusekko 3', carrying rym1 and rym5 was comparatively resistant at all locations studied. The barley genotypes carrying either rym6 or rym9 were susceptible to the viral strains. The genotypes carrying rym5 were resistant in Jinju and Milyang but susceptible in Iksan and Naju. The resistance genes rym2 and rym3 were effective in local strains and would be potent contributors to disease resistance.

Keywords

References

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