Table 3
Air and leaf temperature (T), net photosynthesis (Pn), Fv/Fm (PSII efficiency) and (Area) (plastoquinone pool size) in portions of whitish leaves, sprinkled with kaolin, and portions without kaolin present in the same leaves from treated vines. Data were taken 2 and 4 weeks after treatment (17 August and 31 August) in the interval 13.00-14.00.
| T air (°C) | T leaf (°C) | Pn (nmol CO2 m"2 s"1) | Fv/Fm | Area* | |
|---|---|---|---|---|---|
| 17 August | 38.5 | ||||
| Portion of leaf with kaolin | 42.8 b | 2.6 a | 0.607 a | 21000b | |
| Portion of leaf without kaolin | 47.6 a | -0.3 b | 0.283 b | 10000 a | |
| 31 August | 31.6 | ||||
| Portion of leaf with kaolin | 33.3 b | 11.5 a | 0.780 a | 38600 b | |
| Portion of leaf without kaolin | 36.2 a | 0.4 b | 0.224 b | 13500 a |
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