Identification and mapping of a gene conferring resistance to the spot form of net blotch (Pyrenophora teres f maculata) in barley |
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| Authors: | K J Williams A Lichon P Gianquitto J M Kretschmer A Karakousis S Manning P Langridge H Wallwork |
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| Institution: | (1) South Australian Research and Development Institute, Urrbrae, South Australia 5064, Australia, AU;(2) ARC Special Research Centre for Basic and Applied Plant Molecular Biology, Department of Plant Science, Waite Campus, University of Adelaide, South Australia 5064, Australia, AU |
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| Abstract: | Spot form of net blotch (SFNB) (Pyrenophora teres f maculata) is an economically damaging foliar disease of barley in many of the world’s cereal growing areas. The development of SFNB-resistant
cultivars may be accelerated through the use of molecular markers. A screen for SFNB resistance in 96 lines identified four
new sources of resistance, including a feed variety, ‘Galleon’, for which a fully mapped doubled haploid population was available.
Segregation data indicated SFNB resistance was conferred by a single gene in the ‘Galleon’בHaruna Nijo’ cross, positioned
on the long arm of chromosome 7H. This gene is designated Rpt4 and is flanked by the RFLP loci Xpsr117(D) and Xcdo673 at distances of 6.9 cM and 25.9 cM, respectively. The marker Xpsr117(D) was validated using another population segregating for Rpt4, correctly predicting SFNB resistance with more than 90% accuracy.
Received: 24 September 1998 / Accepted: 19 December 1998 |
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| Keywords: | Hordeum vulgare Disease resistance Genetic mapping RFLP QTL |
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