Resistance to race 1 of Kabatiella caulivora in subterranean clover (Trifolium subterraneum L.) cultivars and breeding lines
P. G. H. Nichols A B C E , M. P. You A D and M. J. Barbetti A BA Department of Agriculture and Food Western Australia, Baron-Hay Court, South Perth, WA 6151, Australia.
B School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Crawley, WA 6009, Australia.
C Centre for Legumes in Mediterranean Agriculture, The University of Western Australia, Crawley, WA 6009, Australia.
D School of Earth and Geographical Sciences, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Crawley, WA 6009, Australia.
E Corresponding author. Email: pnichols@agric.wa.gov.au
Australian Journal of Agricultural Research 59(6) 561-566 https://doi.org/10.1071/AR07262
Submitted: 9 July 2007 Accepted: 5 March 2008 Published: 10 June 2008
Abstract
Twenty-eight cultivars and 106 F6-derived breeding lines of subterranean clover (Trifolium subterraneum) were screened in the field for their response to clover scorch disease caused by race 1 of Kabatiella caulivora. Eleven of the cultivars, including Denmark and Goulburn, were classified as resistant. Breeding lines with Denmark parentage had 55% of progeny with resistance, while those of Goulburn had only 19% of resistant progeny, suggesting different modes of inheritance. Selection for resistance to race 2 of K. caulivora in the F4 generation markedly increased the probability of selecting F6-derived lines with resistance to race 1, suggesting linkage between genes for resistance to both races.
Additional keywords: plant breeding, northern anthracnose, clover scorch, disease resistance, pasture legumes, genetics.
Acknowledgments
We thank Australian Wool International and the Grains Research and Development Corporation for their financial support. We also thank Duncan Wood, Peter Skinner, Kevin Foster, Bradley Wintle, and the staff of Mt Barker Research Station for technical assistance.
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