Wheat Leaf Rust Uredospore Production and Carbon and Nitrogen Export in Relation to Lesion Size and Density

Abstract : To develop mechanistic yield loss models for biotrophic fungi, we need better account for the export of dry matter, carbon and nitrogen from the leaf into the spores. Three experiments in controlled environment chambers were performed to study the dynamics of uredospores production of Puccinia triticina on seedling leaves of wheat in relation to time, lesion density and sporulating surface area. The detrimental effect of lesion density on the sporulation capacity of brown rust lesions was confirmed : when lesion density increased, spores production per lesion strongly decreased. However, our results showed that increasing lesion density also greatly reduces lesion size. A model was developed to summarize these relationships. The main conclusions of our work is that the density effect on spore production per lesion was accounted for by lesion size : when sporulation was related to the sporulating surface area, it became independent of density. As well, carbon and nitrogen contents of the spores were in dependent of lesion density. Our data suggest that when nitrogen available in the host is limiting, spore production is reduced but nitrogen content of spores tend to remain stable.
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Corinne Robert, Marie-Odile Bancal, Christian Lannou. Wheat Leaf Rust Uredospore Production and Carbon and Nitrogen Export in Relation to Lesion Size and Density. Phytopathology, American Phytopathological Society, 2002, 92 (7), pp.762-768. ⟨10.1094/PHYTO.2002.92.7.762⟩. ⟨hal-01959678⟩

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