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Mutations to Virulence and Avirulence in Melampsora lini. G. D. Statler, Department of Plant Pathology, North Dakota State University, Fargo 58105; Phytopathology 75:771-773. Accepted for publication 25 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/Phyto-75-771.

A culture of race 1 of Melampsora lini was crossed with a culture of race 400 to produce a culture heterozygous at several loci. Flax plants inoculated with the heterozygous culture were treated with a solution of NTG (N-methyl-N'-nitro-N-nitrosoguanidine) to induce mutations in M. lini. Isolations were made from compatible infection sites on near-isogenic lines resistant to the culture used. Seven mutant cultures were isolated that were virulent at the AL11, AL8, AM5, and/or AN2 loci after NTG treatment. Three were virulent at AL11, three were virulent at AL8, AM5, and AN2, and one was virulent on AL8 and AN2 after NTG treatment. Nine mutant cultures were avirulent at the AL1, AL10, and/or AM2 loci after NTG treatment. Three were avirulent at the AL1 and AL10 loci, one was avirulent at the AL10 and AM2 loci, two at AL10, and three at the AM2 locus after NTG treatment.

Additional keywords: Linum, flax rust, genetics.