doi:10.1071/AR07262

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, M. J. Barbetti ^A ^B

^A 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





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Australian Journal of Agricultural Research 59(6) 561–566 http://dx.doi.org/10.1071/AR07262
Submitted: 9 July 2007 Accepted: 5 March 2008 Published online: 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.

Keywords: plant breeding, northern anthracnose, clover scorch, disease resistance, pasture legumes, genetics.

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