Table 2.
Chlorophyll fluorescence parameters measured at noon in different days after full bloom (DAFB) in leaves of kaolin treated and control grapevines.
| Treatment | DAFB | F0 | Fv/Fm | ΦPSII | ETR | qP | qN |
|---|---|---|---|---|---|---|---|
| Control | 30 | 473.7a | 0.34a | 0.15a | 98.5a | 0.43a | 1.53a |
| Kaolin | 448.7a | 0.39a | 0.15a | 95.3a | 0.42a | 1.55a | |
| Control | 52 | 444.7a | 0.40b | 0.13b | 77.5b | 0.33b | 1.69a |
| Kaolin | 342.2b | 0.44a | 0.16a | 100.7a | 0.37a | 1.76a | |
| Control | 69 | 440.6a | 0.38a | 0.17b | 106.8b | 0.45a | 1.55b |
| Kaolin | 407.54a | 0.39a | 0.19a | 122.4a | 0.48a | 1.67a | |
| Control | 84 | 434.9 a | 0.35b | 0.15 b | 96.8b | 0.43b | 1.54b |
| Kaolin | 378.3b | 0.37a | 0.17 a | 113.3a | 0.48a | 1.59a | |
Parameters: basal fluorescence (F0), maximum quantum efficiency of photosystem II (Fv/Fm), effective PSII efficiency (ΦPSII), photochemical quenching (qP), electron transport rate (ETR, μmol e- m-2 s-1), and non-photochemical quenching (qN). Different letters indicate significant differences between means within the same the day (p < 0.05).
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