Table 1.
Influence of two levels of nitrogen fertilization on indicators of the physiological state of three different Coffea arabica genotypes under TR (27–22°C) and high light intensity.
| Parameters | Caturra |
GPFA 109 |
GPFA 124 |
|||
|---|---|---|---|---|---|---|
 /N- |
/N+ |
/N- |
/N+ |
/N- |
/N+ |
|
| Hexoses/Sucrose | 0.85 ± 0.09a | 0.41 ± 0.2b | 0.36 ± 0.2a | 0.49 ± 0.1a | 0.46 ± 0.1a | 0.57 ± 0.08a |
| Sucrose (% DW) | 3.9 ± 0.3a | 4.08 ± 0.2a | 2.3 ± 0.07a | 2.57 ± 0.2a | 3.4 ± 0.2a | 3.19 ± 0.2a |
| Starch (%DW) | 2.74 ± 0.8a | 1.7 ± 0.4a | 0.48 ± 0.04a | 0.52 ± 0.008a | 1.07 ± 0.2a | 1.05 ± 0.3a |
| NH4 (PPM) | 120 ± 6a | 142.4 ± 7.7a | 159.3 ± 1a | 177.1 ± 1a | 177 ± 6.1b | 235.4 ± 4.2a |
| C /NH4 | 0.4 ± 0.019a | 0.33 ± 0.017b | 0.30 ± 0.02a | 0.27 ± 0.026a | 0.26 ± 0.009a | 0.20 ± 0.0034b |
| Mangiferin (% DW) | 0.43 ± 0.01a | 0.29 ± 0.045b | 0.65 ± 0.07a | 0.66 ± 0.03a | 0.42 ± 0.05a | 0.42 ± 0.025a |
| Flavonoids (% DW) | 0.99 ± 0.1a | 0.71 ± 0.09b | 1.06 ± 0.05a | 1.17 ± 0.06a | 0.84 ± 0.1a | 0.88 ± 0.02a |
| DICQA (%DW) | 0.46 ± 0.02b | 0.54 ± 0.025a | 0.80 ± 0.025a | 0.79 ± 0.07a | 0.69 ± 0.05a | 0.7 ± 0.09a |
| CQA (%DW) | 3.9 ± 0.07a | 3.37 ± 0.17a | 3.8 ± 0.06a | 4 ± 0.19a | 4.2 ± 0.28a | 4.2 ± 0.021a |
Two treatments were studied: /N- /N+ corresponding to respectively high light intensity (1000 PAR)/low nitrogen fertilization and high light intensity (1000 PAR)/high nitrogen fertilization. The data are means ± SD (n = 3). Different letters denote significant differences between the two treatments according to Tukey’s test (P < 0.05).