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The effect of drought on total polyphenols (a) and flavonols (b) content, and 1,1′-diphenyl-2-picrylhydrazyl (DPPH) activity (c) in I. walleriana grown ex vitro. The “start point”, 15% and 5% of soil moisture content—0, 1 and 2, respectively; results represent mean ± SE (n = 8). The letters indicate statistically significant differences based on the Fischer LSD test (p ≤ 0.05).
