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Spot Form of Net Blotch Resistance in a Diverse Set of Barley Lines in Australia and Canada

April 2012 , Volume 96 , Number  4
Pages  569 - 576

Mark S. McLean, BioSciences Research, Department of Primary Industries, Horsham, VIC, 3401, Australia, and School of Botany, The University of Melbourne, VIC, 3010, Australia; Barbara J. Howlett, School of Botany, The University of Melbourne, Australia; T. Kelly Turkington, Lacombe Research Centre, Agriculture and Agri-food Canada, Lacombe, AB, T4L 1W1, Canada; Greg J. Platz, Department of Employment, Economic Development and Innovation, Warwick, QLD, 4370, Australia; and Grant J. Hollaway, BioSciences Research, Department of Primary Industries, Horsham, Australia

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Accepted for publication 7 November 2011.

The responses of 95 barley lines and cultivars to spot form of net blotch (SFNB) caused by Pyrenophora teres f. maculata were analyzed as seedlings and adults in Australia and Canada. Cluster analyses revealed complex reaction responses. Only 2 lines (Esperance Orge 289 and TR3189) were resistant to all isolates at the seedling stage, whereas 15 lines and cultivars (81-82/033, Arimont, BYDV-018, CBSS97M00855T-B2-M1-Y1-M2-Y-1M-0Y, CI9776, Keel, Sloop, Torrens, TR326, VB0111, Yarra, VB0229, WI-2477, WI2553, and Wisconsin Pedigree) were resistant toward the two Canadian isolates and mixture of Australian isolates at the adult stages. In Australian field experiments, the effectiveness of SFNB resistance in three barley cultivars (Barque, Cowabbie, and Schooner) and one breeding line (VB9104) with a different source of resistance was tested. Barque, which possessed a resistance gene that provided complete resistance to SFNB, was the most effective and showed no effect on grain yield or quality in the presence of inoculum. Generally, cultivars with seedling or adult resistance had less disease and better grain quality than the susceptible control, Dash, but they were not as effective as Barque. A preliminary differential set of 19 barley lines and cultivars for P. teres f. maculata is proposed.

© 2012 The American Phytopathological Society