Figure 5.

The effect of CaCl₂ concentration on stomatal aperture in abaxial epidermal strips of C. communis at two different temperatures. Strips (approximately 35–40) were pre-incubated on 25 cm³ 70 mm KCl at RT for 3 h, then transferred to a second KCl (4.0 cm³) solution with the appropriate concentration of CaCl₂ added, which had been prechilled where necessary. Incubations were carried out under a PPFD of 350 μmol m⁻² s⁻¹ for 1 h; stomatal aperture was measured as in Figure 3.