Comparison of Hyperspectral Imagery and Physiological Characteristics of Bentazone-Tolerant and -Susceptible Soybean Cultivars

Bentazone is a broadleaf post-emergence herbicide widely used for crop production that inhibits photosynthetic activity, resulting in phytotoxicity and injury plants. Evaluating identifying herbicide-tolerant genotypes critical step plant breeding programs. In this study, we determined the reaction of 138 Korean soybean cultivars to bentazone using visual evaluation, selected were further evaluated determine effects on physiological parameters. For parameters, measured normalized difference vegetation index (NDVI) from hyperspectral reflectance images. From 2 4 DAT, NDVI two sensitive was between 0.60 0.69, while tolerant 0.70 0.86. Photosynthesis rate (A), transpiration (E), stomatal conductance (gsw), total CO2 (gtc) chlorophyll fluorescence. Visual score evaluation showed moderate bentazone-tolerant predominant among cultivars. measurements, differences detected -sensitive days after treatment (DAT). However, A, E, gsw, gtc levels dramatically decreased 1 DAT This study provides insights into tolerance sensitivity soybeans bentazone.