Abstract
Wheat stripe rust disease caused by Puccinia striiformis f. sp. tritici (Pst) seriously affects wheat yield. We studied the fungal infection process and host response between wheat ‘AvS’ and its near-isogenic line ‘AvS+Yr10’, which formed compatible and incompatible interactions, respectively, when challenged with Pst race CYR32. The difference in reactive oxygen species (ROS) accumulation between the compatible and incompatible interactions was analyzed by measuring the hydrogen peroxide (H2O2) concentration and observing H2O2 production. Hydrogen peroxide concentrations, H2O2 accumulation areas, necrotic areas and expression of several resistance-related genes in the AvS+Yr10/CYR32 interaction were higher than those in the AvS/CYR32 interaction during the entire infection process. Pst growth was effectively inhibited in the AvS+Yr10 all-stage resistant wheat line. Thus, ROS accumulation is crucial in wheat defence against pathogens.
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