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

Yu, G. T. and Franckowiak, J. D. and Lee, S. H. and 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. ISSN 0831-2796

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher. Copyright of Genome is the property of NRC Research Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 12 Jun 2014 06:51
Last Modified: 02 Jul 2014 05:42
Uncontrolled Keywords: barley; gene mapping; QTL; resistance; Septoria speckled leaf blotch
Fields of Research : 06 Biological Sciences > 0605 Microbiology > 060503 Microbial Genetics
06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820501 Barley
Identification Number or DOI: 10.1139/G10-032
URI: http://eprints.usq.edu.au/id/eprint/25289

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