Table II.
Effects of Zn deficiency on CO2-diffusion resistance
| Resistance | +Zn | ±Zn | −Zn |
|---|---|---|---|
| mol−1 CO2 m2 s | |||
| Stomatal | 4.7 ± 0.5 (40) | 5.7 ± 0.6 (42) | 5.2 ± 0.5 (40) |
| Mesophyll | 7.0 ± 0.5 (60) | 8.0 ± 1.6 (58) | 8.0 ± 1.2 (60) |
| CO2 transfer | 1.2 ± 0.3 (10) | 2.2 ± 0.9 (16) | 2.7 ± 0.7 (21) |
| CO2 fixation | 5.9 ± 0.4 (50) | 5.8 ± 0.8 (42) | 5.3 ± 0.6 (40) |
Values are expressed as means ± se; n = 18 for stomatal and mesophyll resistances and n = 3 for CO2-transfer and CO2-fixation resistances. Numbers in parentheses are percentages relative to the total resistance.