Figure 9.

Chl a, b and carotenoid contents in leaves after the exposure to different light intensities for 14 d. Contents of Chl a, b and carotenoids in leaves of Arabidopsis thaliana [L.] Heynh. ecotype Columbia (Col-0), and the pad2-1 and vtc2-1 mutants. 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 = 10 leaves.