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Resistance

Slow Leaf-Rusting Resistance in Triticale. Jeffrey Wilson, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907; Gregory Shaner, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907. Phytopathology 77:458-462. Accepted for publication 10 September 1986. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/Phyto-77-458.

Six triticales were evaluated as possible sources of resistance to Puccinia recondita for wheat. These lines were evaluated for resistance in the greenhouse and in the field. PIs 429120, 429215, 429121, and 429155 expressed hypersensitivity at all stages of growth, and the last two also had long latent periods in the adult stage. PIs 429220 and 434889 expressed a compatible infection type with a long latent period in the adult stage. Latent periods of these lines were significantly longer in young flag leaves than in old flag leaves. In the field, the final rust severities and areas under the disease progress curves of all the resistant cultivars were low and correlated with each other. Slow-rusting PIs 429220 and 434889 maintained leaf rust severities as low as the lines with hypersensitivity. The hypersensitive and slow-rusting resistances in these lines should be useful for development of wheat cultivars resistant to leaf rust.