抄録
Stomatal movement in response to red and blue light were investigated in leaves of fern, Adiantum capillus-veneris using gas-exchange method. Application of continuous red light to leaves caused significant increases in stomatal conductance. The effect was dependent on fluence rate of red light and saturated around at 100 μmol m-2 s-1. Recovery of conductance to dark level was slow compared with those of Arabidopsis thaliana and Vicia faba. When red light was applied together with far-red light, red light-dependent opening was enhanced. Red light applied to lower leaf surfaces, where stomata were found in ferns, was more efficient to open stomata than that to upper surfaces. Stomata did not open when a blue light was superimposed on a background of photosynthetically saturated red light. These results suggest that Adiantum opens stomata through guard-cell photosynthesis but lacks the blue light specific opening.
