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Effect of different treatments of methyl jasmonate (MJ) and arsenic (As) on chlorophyll fluorescence in terms of photochemical efficiency of PS II (Fv/Fm) in two Brassica napus cultivars leaves. Vertical bars represent the means ± SE. Different letters indicate statistically significant differences (P ≤ 0.05) by applying Duncan’s multiple range test. The treatments consist of the control, two concentrations of MJ and As levels, and their combinations.
