New Sources of Slow Leaf Rusting Resistance in Wheat

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Abstract
Three wheat cultivars were selected from the 1976 International Winter Wheat Rust Nursery because they had a low severity of leaf rust coupled with a compatible infection type. In subsequent inoculations with Puccinia recondita in the greenhouse, the latent period was longer, and uredinia were smaller and fewer compared to susceptible cultivars. The mean latent period on CI 13227 was twice as long as that on ''Monon''. In hill plots in the field, leaf rust developed more slowly on cultivars that showed longer latent periods and smaller and fewer uredinia in greenhouse inoculation experiments. The area under the disease progress curve in the field was correlated with that mathematically predicted from the levels of components of slow rusting measured in the greenhouse. CI 13227 had the highest level of slow leaf rusting resistance.