Table 1.
Leaf assimilation rate (A), stomatal conductance (Gs), mesophyll conductance (Gm), Pi (CO2 intercellular partial pressure)/Pa (CO2 ambient partial pressure), Pc (CO2 chloroplast partial pressure)/Pa and Rd (dark respiration) values of the three plants growing at higher and lower altitudes. Means of a parameter followed by the same letter were not statistically different using a one-way ANOVA (P > 0.05) with least significant difference (LSD) post hoc test.
| Q. spinosa | S. atopantha | R. dentatus | F5,30 | P-value | |
|---|---|---|---|---|---|
| A (μmol m−2 s−1) | |||||
| Low elevation | 8.00 ± 0.45 b | 7.02 ± 0.17 b | 11.62 ± 0.54 c | 127.316 | 2.907 × 10−19 |
| High elevation | 2.59 ± 0.30 a | 14.57 ± 0.88 c | 21.33 ± 0.54 d | ||
| Gs (mol m−2 s−1) | |||||
| Low elevation | 0.15 ± 0.01 b | 0.10 ± 0.01 c | 0.19 ± 0.01 d | 79.759 | 2.096 × 10−16 |
| High elevation | 0.04 ± 0.01 a | 0.17 ± 0.01 d | 0.33 ± 0.02 e | ||
| Gm (mol m−2 s−1) | |||||
| Low elevation | 0.09 ± 0.01 a | 0.12 ± 0.01 a | 0.21 ± 0.02 c | 63.573 | 4.712 × 10−15 |
| High elevation | 0.04 ± 0.01 b | 0.26 ± 0.01 c | 0.44 ± 0.02 d | ||
| Rn (μmol m−2 s−1) | |||||
| Low elevation | 1.21 ± 0.04 a | 1.34 ± 0.12 ab | 1.69 ± 0.14 b | 24.353 | 9.959 × 10−10 |
| High elevation | 3.41 ± 0.29 e | 1.83 ± 0.06 c | 2.44 ± 0.12 d | ||
| Pi/Pa | |||||
| Low elevation | 0.56 ± 0.02 a | 0.58 ± 0.01 a | 0.65 ± 0.02 b | 3.549 | 0.0122 |
| High elevation | 0.58 ± 0.02 a | 0.61 ± 0.01 ab | 0.65 ± 0.01 b | ||
| Pc/Pa | |||||
| Low elevation | 0.31 ± 0.02 a | 0.35 ± 0.02 ab | 0.42 ± 0.03 b | 4.444 | 0.00379 |
| High elevation | 0.31 ± 0.03 a | 0.36 ± 0.01 a | 0.44 ± 0.01 b | ||