Figure 8

Measurement of photosynthetic parameters in plants with enhancedVQ1 or VQ10 gene expression. The maximum quantum efficiency (Fv/Fm), effective quantum yield of PSII reaction centers (ΦPSII ), non-photochemical quenching (NPQ) and its related qN, and the proportion of open PSII centres (qP) were measured in untreated (mock) plants as well as in plants treated with 30 µM methyl viologen (MV) for 16 h (oxidative stress) of the indicated genotypes. Box plots are shown displaying the median (horizontal bar inside the box), and the error interval. Statistical significance was assessed by unpaired t-test comparing each genotype to Col-0 under mock or stress conditions. *p < 0.05; **p < 0.005; and ***p < 0.001.