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Influence of phytohormones on Kunitz-PI;1 promoter activity (Upper row) and HEC1-promoter activity (Lower row). Etiolated seedlings of the pKunitz-PI;1::GUS and pHEC1::GUS lines, respectively, were grown on Murashige–Skoog medium containing ACC as ethylene precursor, silver nitrate as ethylene biosynthesis inhibitor, or IAA as auxin, for 3 days. Then, GUS activity was monitored to visualize promoter activity.
