Figure 2. Chlorophyll fluorescence and photosynthesis parameters in the yellow-green leaf mutant inbred line and the normal green leaf inbred line.

(A) Indicated the original chlorophyll fluorescence parameters. (B) Showed real-time fluorescence yield Ft in the normal green leaf inbred line and the yellow-green leaf mutant. The point pointed by the arrows indicated the turned on of the actinic light. (C) Indicated additional chlorophyll fluorescence parameters of the normal green leaf inbred line and the yellow-green leaf mutant. Small letters a and b indicate differences between the yellow-green leaf mutant and the normal green leaf inbred line at P < 0.05, according to least significant difference (LSD) tests. (D) Showed light response curves of net photosynthesis in the yellow-green leaf mutant and the normal green leaf inbred line. Pn is the net photosynthesis rate. The light response curves were measured at nine PAR levels (0, 50, 100, 200, 400, 800, 1,200, 1,600 and 2,000 μmolphotons·m⁻²·s⁻¹). The dark respiration rate is defined as the Pn value when the light response curve intersects the Y-axis. The measurement was performed for three times. The error bars represented the standard errors.