Figure 2.

Stomatal responses to red and far-red light in Adiantum. A, Increase in stomatal conductance by red (R; 50 μmol m⁻² s⁻¹) plus far-red (FR; 300 μmol m⁻² s⁻¹) light (black line) or by red light alone (R; gray line). Lights were applied to the upper surface of the leaf as indicated by the upward-pointing arrow. B and C, Increase in stomatal conductance by a sequential application of red (R; 2 μmol m⁻² s⁻¹) and far-red (FR; 50 μmol m⁻² s⁻¹) light. Red and far-red lights were applied as indicated by the black and white arrows, respectively.