Table II.

An example of how total stomatal conductance to g_s was calculated in control and ABA-treated leaves

Quantity	Control Leaf	ABA-Treated Leaf	Units
Pg	1.09	1.09	MPa
a	18.4  × 10−6	8.15  × 10−6	m
a′	0.582  × 10−9	0.145  × 10−9	m2
nsu	4.24  × 10−6	4.47  × 10−6	m−2
nsl	11.4  × 10−6	19.7  × 10−6	m−2
D	24.9  × 10−6	24.9  × 10−6	m2 s−1@ 25°C
l	18  × 10−6	18  × 10−6	m
V	24.4  × 10−3	24.4  × 10−3	m3 mol−1@ 25°C, 101.3 kPa
gs(upper)	0.122	0.028	mol m−2 s−1@ 25°C, 101.3 kPa
gs(lower)	0.236	0.125	mol m−2 s−1@ 25°C, 101.3 kPa
gs(total)	0.358	0.153	mol m−2 s−1@ 25°C, 101.3 kPa

For this example, P_g is 1.09 MPa. P_e = 0. From Figure 4, a′ = 31.7 × 10⁻⁶a for control; a′ = 17.8 × 10⁻⁶a for ABA-treated plants. Note that in this table a and a′ are in units of m and m², respectively, whereas in Figure 4, units are μm and μm². Stomatal conductances for upper leaf surface (g_s(upper)) and lower leaf surface (g_s(lower)) were obtained from Equation 1 using values of n_su and n_sl from Table I. g_s(total) = g_s(upper) ⁺ g_s(lower).