Fig. 4
From: Physiological responses of Lepidium meyenii plants to ultraviolet-B radiation challenge
Effects of UV-B irradiation on the maximum (Fv/Fm) and actual (ΦPSII) efficiency of PSII photochemistry. Fv/Fm (a, c) and ΦPSII (b, c) were evaluated in leaves of UV-B treated and control plants before (a, b) and after recovery (c, d). Treated plants were exposed to 100 μmol quanta m− 2 s− 1 and 6.08 kJ m− 2 d− 1 UV-B. UV-B was daily applied following a time course from 1 to 14 days. Control plants did not receive UV-B radiation. For recovery test, UV-B treated plants were transferred to control conditions for two weeks. Error bars represent the standard error of the mean (n = 3). The different letters indicate significant differences between means tested using Tukey’s HSD tests (P < 0.05)