Fig. 4

Light intensity dependence of the photosynthetic electron flow through PSI (ETRI) and PSII (ETRII), and P700⁺ reduction curve in leaves of alfalfa seedlings with or without apical buds. Five treatments in the seedlings with apical buds are as Fig.2, and six treatments in the seedlings without apical buds are as Fig.3. The ETRI (a), ETRII (b) and P700⁺ reduction curve (c) were estimated from seedlings with apical buds, and ETRI (d), ETRII (e) and P700⁺ reduction curve (f) were estimated from seedlings without apical buds on day 3. At least 6 different leaves from different seedlings were used for each treatment and data are means ± SE of three replicates