A novel QTL for Septoria speckled leaf blotch resistance in barley (Hordeum vulgare L.) accession PI 643302 by whole-genome QTL mapping

Article


Yu, G. T., Franckowiak, J. D., Lee, S. H., Horsley, R. D. and Neate, S. M.. 2010. "A novel QTL for Septoria speckled leaf blotch resistance in barley (Hordeum vulgare L.) accession PI 643302 by whole-genome QTL mapping." Genome. 53 (8), pp. 630-636. https://doi.org/10.1139/G10-032
Article Title

A novel QTL for Septoria speckled leaf blotch resistance in barley (Hordeum vulgare L.) accession PI 643302 by whole-genome QTL mapping

ERA Journal ID2384
Article CategoryArticle
AuthorsYu, G. T. (Author), Franckowiak, J. D. (Author), Lee, S. H. (Author), Horsley, R. D. (Author) and Neate, S. M. (Author)
Journal TitleGenome
Journal Citation53 (8), pp. 630-636
Number of Pages7
Year2010
Place of PublicationOttawa, Canada
ISSN0008-4093
0831-2796
1480-3321
Digital Object Identifier (DOI)https://doi.org/10.1139/G10-032
Web Address (URL)http://www.nrcresearchpress.com/doi/abs/10.1139/G10-032
Abstract

Septoria speckled leaf blotch (SSLB), caused by Septoria passerinii, is one of the most important foliar diseases of barley (Hordeum vulgare L.) in North America. The primary problem caused by this disease is substantial yield loss. The objective of this study was to determine the chromosomal location of SSLB resistance genes in the barley accession PI 643302. A recombinant inbred line population was developed from the cross Zhenongda 7/PI 643302. PI 643302 is resistant while Zhenongda 7 is susceptible to SSLB. The population was phenotyped for SSLB resistance in five experiments in the greenhouse. A linkage map comprising 113 molecular markers was constructed and simplified composite interval mapping was performed. Two QTLs, designated QrSp-1H and QrSP-2H, were found. QrSp-1H was found on the short arm of chromosome 1H (1HS) in all five experiments and showed a large effect against SSLB. Based on the location of QrSp-1H, it is likely the SSLB resistance gene Rsp2. The QTL QrSp-2H mapped to the distal region on the long arm of chromosome 2H (2HL), had a smaller effect than QrSp-1H, and was also detected consistently in all five experiments. A QTL for SSLB resistance in the same region on chromosome 2H has not been reported previously in either cultivated or wild barley; thus, QrSp-2H is a new QTL for SSLB resistance in barley.

Keywordsbarley; gene mapping; QTL; resistance; Septoria speckled leaf blotch
ANZSRC Field of Research 2020310704. Microbial genetics
310805. Plant pathology
300406. Crop and pasture improvement (incl. selection and breeding)
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Byline AffiliationsNorth Dakota State University, United States
Department of Primary Industries and Fisheries, Queensland
Samuel Roberts Noble Foundation, United States
Institution of OriginUniversity of Southern Queensland
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