Fig. 8.

Comparisons of photosynthetic efficiency (mean Fv/Fm) and chlorophyll concentration in sgrL ³⁴²¹ mutant and cv. Cameor (control) plants under well-watered or drought-stressed conditions with significance values determined by t tests, as indicated by brackets (**p < 0.01, ***p < 0.001) a Light intensities (kilolux) during the day at the times shown for two contrasting days, RD0 (blue bars) and RD7 (red bars). b Mean Fv/Fm of cv. Cameor and sgrL ³⁴²¹ mutant plants under well-watered or drought-stressed conditions for RD0 and RD7 taken at 13:30 each day. c, d Chlorophyll (a, b and total) concentration of leaf areas of cv. Cameor and sgrL ³⁴²¹ mutant plants under well-watered (W) or drought-stressed (D) conditions for RD0 (c) and for RD7 (d). e, f Change in Fv/Fm over 12 h of one day (RD13) for well-watered sgrL ³⁴²¹ (red) and well-watered cv. Cameor (blue) (e) and well-watered cv. Cameor (blue), drought-stressed cv. Cameor (red) and drought-stressed sgrL ³⁴²¹ (purple) (f) plants, where relative light intensity (kilolux, right-hand scale) is shown as green bars; both sets of drought-stressed plants received 20 ml water per plant at 14:30. Significance values were determined by t tests (*p < 0.05, ***p < 0.001) and indicate differences between the data points indicated