Sunflower rust, which is one of the major diseases of sunflower, globally spreads in the sunflower planting area triggering a heavy loss in the production. In this study, in order to reveal the mechanism of host resistance, leaf structure, changes of defense enzymes, several resistant material and accumulation of reactive oxygen species on resistant and susceptible cultivars were detected. Also, the infection process of Puccinia helianthi Schw. by electron microscope was observed. Results were as fol...
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