Table 5.
Leaf macronutrient (mg g-1 DW) and micronutrient (μg g-1 DW) contents in C. arabica cv. Icatu collected at 25°C, and within the ranges of 30–35 and 36–40°C (diurnal temperatures).
| Diurnal temperature at bean harvest |
||||
|---|---|---|---|---|
| Mineral | [CO2] (μL L-1) | 25°C | 30–35°C | 36–40°C |
| Macronutrients | ||||
| N | 380 | 24.4 ± 1.0 aA | 25.9 ± 1.5 aA | 26.8 ± 1.4 aA |
| (mg g-1 DW) | 700 | 22.5 ± 0.7 aA | 23.1 ± 0.4 aA | 24.2 ± 0.6 aA |
| P | 380 | 2.47 ± 0.07 aA | 2.43 ± 0.06 aA | 2.35 ± 0.05 aA |
| (mg g-1 DW) | 700 | 2.25 ± 0.06 aB | 2.20 ± 0.04 aB | 2.33 ± 0.05 aA |
| K | 380 | 16.7 ± 0.5 aA | 17.1 ± 0.4 aA | 17.6 ± 0.2 aA |
| (mg g-1 DW) | 700 | 16.9 ± 0.5 aA | 17.7 ± 0.3 aA | 17.5 ± 0.4 aA |
| Ca | 380 | 2.10 ± 0.15 bA | 2.75 ± 0.29 abA | 3.00 ± 0.20 aA |
| (mg g-1 DW) | 700 | 2.23 ± 0.14 aA | 2.25 ± 0.22 aA | 2.88 ± 0.11 aA |
| Mg | 380 | 2.81 ± 0.86 bA | 3.95 ± 0.28 aA | 4.00 ± 0.10 aA |
| (mg g-1 DW) | 700 | 3.45 ± 0.15 aA | 3.83 ± 0.41 aA | 3.83 ± 0.28 aA |
| S | 380 | 2.67 ± 0.12 aA | 2.83 ± 0.09 aA | 2.80 ± 0.00 aA |
| (mg g-1 DW) | 700 | 2.58 ± 0.05 aA | 2.58 ± 0.03 aA | 2.63 ± 0.03 aA |
| Cl | 380 | 2.03 ± 0.03 aA | 1.80 ± 0.15 aA | 1.95 ± 0.05 aA |
| (mg g-1 DW) | 700 | 1.78 ± 0.06 aB | 1.83 ± 0.06 aA | 1.90 ± 0.04 aA |
| Micronutrients | ||||
| Fe | 380 | 190 ± 21 aA | 200 ± 34 aA | 175 ± 5 aA |
| (μg g-1 DW) | 700 | 260 ± 42 aA | 168 ± 10 bA | 170 ± 16 bA |
| Cu | 380 | 49.3 ± 9.0 aA | 46.8 ± 12.0 aA | 55.5 ± 5.5 aA |
| (μg g-1 DW) | 700 | 75.3 ± 10.5 aA | 46.0 ± 5.7 abA | 38.0 ± 3.5 bA |
| Zn | 380 | 49.3 ± 3.8 aA | 58.3 ± 9.5 aA | 62.0 ± 3.0 aA |
| (μg g-1 DW) | 700 | 64.5 ± 8.3 aA | 51.3 ± 3.6 aA | 45.5 ± 3.6 aA |
| Mn | 380 | 39.0 ± 3.0 bA | 50.5 ± 2.5 abA | 54.5 ± 4.5 aA |
| (μg g-1 DW) | 700 | 42.0 ± 1.8 aA | 41.8 ± 0.5 aA | 49.8 ± 1.8 aA |
| Sr | 380 | 5.67 ± 0.72 bA | 8.25 ± 0.89 bA | 12.50 ± 1.06 aA |
| (μg g-1 DW) | 700 | 5.25 ± 0.41 bA | 5.25 ± 0.41 bB | 8.50 ± 0.43 Ab |
| Ni | 380 | BDL | BDL | BDL |
| (μg g-1 DW) | 700 | 16.33 ± 1.62 a | 8.00 ± 1.53 b | 6.00 ± 0.00 b |
For each parameter, the mean values ± SE (n = 4, performing two replicates of four plants) followed by different statistical indexes express significant differences between temperatures for the same CO2 treatment (a, b), or between CO2 treatments within each temperature (A, B). Although a few mean differences were observed, the two-way ANOVA depicted significant changes for [CO2] (P, Sr), temperature (Ca, Mg, Fe, Cu, Zn, Mn, Sr), and the interaction (Cu, Zn). BDL, below detection limit.