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Histogram of the quantitative estimation for polyphenol oxidase gene expression in roots of potato “Spunta” cultivar treated with (A) 0.1 mM, (B) 0.5 mM, (C) 1.0 mM, and (D) 5 mM of ethylene before infection with G. rostochiensis; healthy plants as control at 1, 24, 48, and 72 h after infection with G. rostochiensis; healthy plants as control at 12, 24, and 48 h and 7, 14, 21, 28, and 35 d.
