Effects of <i>Dittrichia viscosa</i> volatiles on photochemical quantum yield of the PSII, the quantum yield of light-induced nonphotochemical quenching and chlorophyll fluorescence.

<p>Values of the effective photochemical quantum yield of the light adapted PSII <i>Φ</i>_II, the quantum yield of light-induced nonphotochemical quenching <i>Φ</i>_NPQ and chlorophyll fluorescence <i>Φ</i>_NO in whole lettuce plants after <i>D</i>. <i>viscosa</i> VOCs exposition (50 g of plant material). Asterisks along the curves indicate statistical differences with (<i>P</i> ≤ 0.05). * <i>p</i> < 0.05; ** <i>p</i> < 0.01; *** <i>p</i> < 0.001. T₀ –T₄ = days of treatment. AU = Arbitrary Units. N = 3.