Figure 6.
Photosynthesis efficiency and photoprotection capacities of rice seedlings grown in red and blue light. Rice seedlings were grown for 6 days under low (40 µmol m−2 s−1) (R40) or high (450 µmol m−2 s−1) (R450) red (R) light, and low (10 µmol m−2 s−1) (B10) or high (150 µmol m−2 s−1) (B150) blue (B) light at 28°C. (a) Maximum quantum yield of PSII (Fv/Fm). Values refer to four independent seedlings. Multiple groups were analysed by one-way ANOVA. Different letters denote statistically significant differences among means of each group by Tukey's test. (b) Representative coloured images of non-photochemical quenching (NPQ) in the second leaf data shown in (c). The colour scale is shown on the right. Left panel: NPQ induction after 5 min in high light. Right panel: NPQ relaxation after 20 min in the dark. (c) NPQ induction (light) and relaxation (dark). Values are the means ± s.d. for six independent seedlings grown under the specified light conditions. (d) Relative gene expression of PSBS1 and PSBS2. Data are the means ± s.e.m of independent biological triplicates. Means were compared by Student's t-test, and asterisks denote statistically significant differences: p-values <0.05 (*), and <0.001 (***). Black dots in (d) denote individual data points.