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ChlF properties of Chinese kale subjected to different durations of UVA-radiation exposure. (A) Fv/Fm. (B) Y(II). (C) Y(NO). (D) Y(NPQ). (E) qN. (F) NPQ. (G) qP. (H) qL. (I) ETR. Different lowercase letters (a,b) labeled on the vertical bar (means ± standard error, n = 3) represent significant differences by one-way ANOVA with multiple-range tests (p ≤ 0.05).
