Abstract
Crown rot (CR) is one of the most destructive diseases of barley and wheat. Fusarium species causing CR survive in crop residue and a growing acceptance of stubble retention practices has exacerbated disease severity and yield loss. Growing resistant cultivars has long been recognised as the most effective way to reduce CR damage but these are not available in barley. In a routine screening of germplasm, a barley landrace from China gave the best CR resistance among the genotypes tested. Using a doubled haploid population derived from this landrace crossed to Franklin, we demonstrate that the CR resistance of TX9425 was conditioned by a major QTL. The QTL, designated as Qcrs.cpi-3H, was mapped near the centromere on the long arm of chromosome 3H. Its effect is highly significant, accounting for up to 63.3% of the phenotypic variation with a LOD value of 14.8. The location of Qcrs.cpi-3H was coincident with a major QTL conferring plant height (PH) and the effect of PH on CR reaction was also highly significant. When the effect of PH was accounted for by covariance analysis, the Qcrs.cpi-3H QTL remained highly significant, accounting for over 40% of the phenotypic variation. The existence of such a major QTL implies that breeding barley cultivars with enhanced CR resistance should be feasible.
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The authors are grateful to Dr. Scott Chapman for his help with data analyses, and Dr. Sukumar Chakraborty for his critical reading of the manuscript.
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Communicated by H. H. Geiger.
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Li, H.B., Zhou, M.X. & Liu, C.J. A major QTL conferring crown rot resistance in barley and its association with plant height. Theor Appl Genet 118, 903–910 (2009). https://doi.org/10.1007/s00122-008-0948-3
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DOI: https://doi.org/10.1007/s00122-008-0948-3