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Fluorescence intensity of petiole and stem cross sections of soil-grown B. oleracea plants. Graphs depict the average fluorescence values in (n = 4) petiole or stem cross sections. The fan-shaped and circular vascular bundles were selected as ROIs using Image J software and fluorescence values were recorded. The data were collected at 10, 30, 60 and 90 min after application of CF dye, Alexa-BSA or -Histone.
