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In this research, the wheat cultivar 'Lovrin 10' and  Puccinia triticina  races 165 and 260 were used to constitute compatible and incompatible combinations to investigate the relationship between NO and H 2 O 2  and between NO and calcium (Ca 2+ ) signaling in the cell defense process by pharmacological means. The specific fluorescent probe DAF-FM DA was coupled with confocal laser scanning microscopy and used to label intracellular nitric oxide (NO) and monitoring the real-time NO dynamics during the processes of wheat defense response triggered by  P .  triticina  infection. The results showed that at 4 h after inoculation, weak green fluorescence was observed in the stomatal guard cells at the  P .  triticina  infection site in the incompatible combination, which indicates a small amount of NO production. Twelve hours after inoculation, the fluorescence of NO in- cell adjacent to the stomata gradually intensified, and the NO fluorescent area also expanded continuously; the green fluorescence primarily occurred in the cells undergoing a hypersensitive response (HR) at 24–72 h after inoculation. For the compatible combination, however, a small amount of green fluorescence was observed in stomata where the pathogenic contact occurred at 4 h after inoculation, and fluorescence was not observed thereafter. Injections of the NO scavenger c-PTIO prior to inoculation postponed the onset of NO production to 48 h after inoculation and suppressed HR advancement. The injection of imidazole, a NADPH oxidase inhibitor, or EGTA, an extracellular calcium chelator, in the leaves prior to inoculation, delayed the onset of NO production in the incompatible combination and suppressed HR advancement. Combined with our previous results, it could be concluded that, Ca 2+  and hydrogen peroxide (H 2 O 2 ) are involved in upstream of NO production to induce the HR cell death during  P .  triticina  infection, and Ca 2+ , NO and H 2 O 2  are jointly involved in the signal transduction process of HR in the interaction system.

Changes of Nitric Oxide and Its Relationship with H2O2 and Ca2+ in Defense Interactions between Wheat and Puccinia Triticina