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The effect of drought on total chlorophyll (a), total carotenoid (b), H2O2 (c) and malondialdehyde (MDA) (d) content 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).
