The integral defense responses of plants triggered by the small molecules of plant pathogens are regarded as plant immunity. The pathogen-associated molecular pattern-triggered immunity (PTI) occurs on the recognition of a pathogen by receptors on plant cell surfaces as an infection begins. During the activation of PTI, the effectiveness of a plant's photosynthetic system may be altered. In this study, chlorophyll fluorescence was used to assay the dynamic changes of PTI. When we used flg22 as an elicitor, we found that the photosynthetic electron transport rate (ETR) of Col-0 was significantly decreased at 2, 4, and 24 h on treatment with a PTI-intensifying protein, plant ferredoxin-like protein (PFLP). In addition, this reduction in the photosynthetic ETR was also carried out with a PTI-intensifying strain, PMB05, on the induction of flg22. The disease resistance against bacterial soft rot caused by subsp. (Pcc) was still enhanced by PMB05. Interestingly, among the eight tested species strains, the PTI triggered by HrpN from subsp. exhibited an ETR that was significantly decreased by PMB05. Furthermore, this decrease was consistent with rapid HO generation and callose deposition triggered by HrpN and the disease resistance against bacterial soft rot. Taken together, such results led us to conclude that the assay based on the ETR established in this study can be used as a model for evaluating the effectiveness of plant immunity-intensifying microbes for controlling plant diseases.
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