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High temperature stimulates auxin-inducible gene expression. Wild-type (Col) seedlings carrying a pIAA4-GUS reporter gene were grown for 10 days at 20°C or 29°C on ATS nutrient media and stained for GUS expression. (a) 20°C; (b) 29°C; (c) pIAA4-GUS expression in the roots of 10-day-old wild-type seedlings grown at 29°C (Upper) or 20°C (Lower). LR, lateral root; PR, primary root. (Bars: a and b = 5 mm, c = 0.5 mm.)
