Figure 8

Areas of internal chloroplast structures after the exposure to different light intensities for 14 d. Area (in μm²) and percentage of areas of internal chloroplast structures detected by TEM on a longitudinal ultrathin section within the mesophyll of leaves from the wildtype (Col-0), the pad2-1 and the vtc2-1 mutants after the exposure to different light intensities for 14 d. Data are means with standard errors. Significant differences were calculated within one line of plants between control conditions (exposure to 150 μmol m^-2 s^-1) and the same line exposed to the other light intensities by using the Mann Whitney U-test; *, ** and ***, respectively, indicate significance at the 0.05, 0.01 and 0.001 levels of confidence. n > 100 chloroplasts per treatment.