Supplementary Light Source Affects Growth, Metabolism, and Physiology of Adenophora triphylla (Thunb.) A.DC. Seedlings

Figure 3

Stomatal development in A. triphylla leaves after four weeks of cultivation under different supplementary light sources: HPS, high pressure sodium ((a) and (f)); MH, metal halide ((b) and (g)); FR, far-red ((c) and (h)); LED-w, white (red: green: blue = 2:4:3) light-emitting diodes ((d) and (i)); and LED-mix, mixed (red: green: blue = 4:1:4) light-emitting diodes ((e) and (j)). Bar, 10 ((f)–(j)) or 50 ((a)–(e)) μm.