Mapping of adult plant resistance to net form of net blotch in three Australian barley populations
A. Lehmensiek A , G. J. Platz B , E. Mace B , D. Poulsen B and M. W. Sutherland A CA Centre for Systems Biology, University of Southern Queensland, Toowoomba, Qld 4350, Australia.
B Queensland Department of Primary Industries and Fisheries, Hermitage Research Station, Warwick, Qld 4370, Australia.
C Corresponding author. Email: marksuth@usq.edu.au
Australian Journal of Agricultural Research 58(12) 1191-1197 https://doi.org/10.1071/AR07141
Submitted: 4 April 2007 Accepted: 14 August 2007 Published: 17 December 2007
Abstract
Net form of net blotch (NFNB), caused by Pyrenophora teres Drechs. f. teres Smedeg., is a serious disease problem for the barley industry in Australia and other parts of the world. Three doubled haploid barley populations, Alexis/Sloop, WI2875-1/Alexis, and Arapiles/Franklin, were used to identify genes conferring adult plant resistance to NFNB in field trials. Quantitative trait loci (QTLs) identified were specific for adult plant resistance because seedlings of the parental lines were susceptible to the NFNB isolates used in this study. QTLs were identified on chromosomes 2H, 3H, 4H, and 7H in both the Alexis/Sloop and WI2875-1/Alexis populations and on chromosomes 1H, 2H, and 7H in the Arapiles/Franklin population. Using QTLNetwork, epistatic interactions were identified between loci on chromosomes 3H and 6H in the Alexis/Sloop population, between 2H and 4H in the WI2875-1/Alexis population, and between 5H and 7H in the Arapiles/Franklin population. Comparisons with earlier studies of NFNB resistance indicate the pathotype-dependent nature of many resistance QTLs and the importance of establishing an international system of pathotype nomenclature and differential testing.
Acknowledgments
The authors thank the Grains Research & Development Corporation for funding this research through the Australian Winter Cereals Molecular Marker Program. We thank Dr Jerome Franckowiak for his valuable comments and reading of the manuscript.
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