Fig. 7
Variation in SPAD value over 2 weeks after transplanting seedlings grown under mono red (R) and an optimal photon ratio based on leaf area×SPAD parameter at seedling (Optimal_S) light treatments to white LED in experiment 2 (A). The change in SPAD value after transplanting was measured every 2 days for 2 weeks for the verification experiment (n = 4). Photosynthetic rate (Pn), transpiration rate (E), intercellular CO2 concentration (Ci), and stomatal conductance (gsw) of lettuce plants grown under mono R and Optimal_S light during the seedling stage at 2 and 3 weeks after transplanting (n = 4) (B). ** indicates significant differences at p < 0.01 based on Student’s t-test