Table 3.
Effect of elevated levels of CO2 on colonization, conidia and fibrosin bodies of S. fuliginea, cuticular traits, physiological and biochemical parameters of cucumber inoculated with the powdery mildew fungus.
| CO2 Concentrations (ppm) | S. fuliginea. | Colonization (%) | Trans piration (mmol H2O m-2 s−1) | Stomatal Conductance (mol m-2 s−1) | Phenolic contents (µg g−1 fresh leaf) | Carotenoids (µg g−1 fresh leaf) | Conidial size (µm) | Fibrosin bodies/conidia | Trichomes/cm2 | Stomata/cm2 | Size of stomatal aperture (µm) | Trichome length (µm) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| length | width | ||||||||||||
| Control (ambient) | Un inoculated | 2.313 | 2.111 | 112.56 | 36.31 | 107.33 | 70.55 | 2.20 | 75.62 | ||||
| 400 | 2.227 | 2.033 | 108.78 | 36.78 | 111.09 | 73.02 | 2.09 | 79.92 | |||||
| 500 | 2.096 | 1.913 | 106.35 | 39.14 | 115.38 | 75.84 | 1.92 | 86.78 | |||||
| 600 | 2.019 | 1.843 | 105.95 | 39.90 | 118.6 | 77.96 | 1.66 | 91.02 | |||||
| Control | Inoculated | 48.55 | 2.505 | 2.286 | 129.12 | 33.37 | 25.32 | 10.63 | 5.03 | 100.25 | 65.89 | 2.46 | 69.14 |
| 400 | 50.25 | 2.419 | 2.208 | 134.23 | 33.44 | 26.13 | 10.97 | 5.19 | 103.79 | 68.22 | 2.38 | 72.48 | |
| 500 | 55.83 | 2.285 | 2.086 | 135.70 | 35.84 | 26.21 | 11.00 | 5.21 | 108.4 | 71.26 | 2.07 | 79.26 | |
| 600 | 53.89 | 2.211 | 2.018 | 136.54 | 36.60 | 26.28 | 11.03 | 5.22 | 111.09 | 73.02 | 1.98 | 82.24 | |
| LSD (P ≤ 0.05) | |||||||||||||
| Treatment | — | 0.04 | 0.04 | 2.42 | 1.25 | — | — | — | 2.29 | 1.7 | 0.04 | 1.62 | |
| CO2Level | 1.98 | 0.07 | 0.06 | 3.42 | 1.77 | 0.67 | 0.59 | 0.60 | 3.24 | 2.41 | 0.06 | 2.3 | |
| CO2Level:Treatment | — | 0.09 | 0.09 | 4.84 | 2.51 | — | — | — | 4.59 | 3.41 | 0.08 | 3.24 | |
Each value is mean of 5 replicates. Ambient ~375 ppm CO2.