Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: 4/17/2005
Publication Date: 4/1/2006
Citation: Edwards, M.C., Bragg, J., Jackson, A.O. 2006. Natural resistance mechanisms to viruses in barley. In: Loegenstein, G., Carr, J.P. editors. Natural resistance mechanisms of plants to viruses. Springer, Berlin. p.465-501. Interpretive Summary:
Technical Abstract: Barley stripe mosaic virus, the barley yellow dwarf complex, and the barley yellow mosaic/barley mild mosaic complex cause widespread diseases in barley. The most effective control of BSMV is achieved by eliminating it from seed stocks; hence, only one BSMV resistance gene, rsm1, has been identified. Three resistance genes (ryd1, Ryd2, and Ryd3) have been identified for the aphid-transmitted BYDV complex, whilst fifteen loci (rym1, rym2, rym3, rym4, rym5, rym6, rym7, rym8, rym9, rym10, rym11, rym12, rym13, Rym14Hb, rym15) confer varying degrees of protection against the fungally-transmitted BaYMV/BaMMV complex. Only rudimentary knowledge of the mechanisms by which virus resistance genes function in barley is currently available, but cloning and characterization of these genes promises to allow exploration of these mechanisms in much greater detail. Cloning of at least one of these genes (rym4) is imminent. Advances in barley transformation and identification of resistance genes will provide important resources for cross species transfer of existing disease resistance, and for incorporation of synthetic genes for resistance into barley.