Assessment of Bacterial Wildfire Infection in Soybean Cultivars by Hyperspectral Imaging

초록

Soybean [Glycine max (L.) Merr.] is an economically important protein and oilseed legume. Bacterial wildfire, a major biotic stress caused by Pseudomonas syringae pv. tabaci (Pst), has steadily increased in occurrence and severity across several soybean cultivars, presenting a significant risk to soybean production. This study aimed to investigate and evaluate the effect of bacterial wildfires on selected soybean cultivars using imaging approaches, such as hyperspectral and digital imaging with red, green, and blue methods. A significant difference between the tolerance and sensitivity of the plants was observed in this study. In the present study, the disease incidence (DI) exhibited was observed in all soybean cultivars 2 days after inoculation (DAI). Taekwang (52.41%) showed more symptoms with a sensitive response to disease infection and showed a significant difference in DI compared with the other cultivars, whereas Daephung 2, Seunphung, and Soyun showed fewer symptoms on leaves (< 10%). Additionally, among the three vegetation indices (VIs), the normalized difference vegetation, photochemical reflectance, and anthocyanin reflectance indices were significantly correlated with DI at 3 DAI. Hence, these VIs can be used for the early detection of bacterial wildfires; however, further research is needed for more precise and accurate disease detection.

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