Fig. 2.

Photosynthetic parameters of Welsh onions under different light conditions, including: a net photosynthetic rate (P_n); b transpiration rate (E); c stomatal conductance (G_s); and d intercellular CO₂ concentration (C_i). These photosynthetic parameters were measured under white, blue, red, green, and yellow light for about 5 min each. Values are means of 5 replicates ± SD. Different letters (a, b, c, d) in the same column indicate significant differences among treatments at P ≤ 0.05 according to Duncan’s new multiple range test. W: white light; B: blue light; G: green light; Y: yellow light; R: red light. n = 5