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Table 2

Effect of kaolin on leaf temperature (T), net photosynthesis (Pn), transpiration rate (E), Fv/Fm (efficiency of PSII) and Area parameter (size of plastoquinone pool) in well exposed external leaves of Pinot noir vines. Kaolin treatment was executed on 3 August. Data were taken 7 and 18 days after treatment (10 August and 21 August) in the interval 13.00-14.00.

  T air (°C) T leaf (°C) Pn (nmol CO2 m"2 s"1) E (mmol H2O m"2 s"1) Fv/Fm Area*
10 August
Untreated 36.4 47.4 b 0.9 b 0.8 b 0.486 b 18900b
Kaolin   42.2 a 5.1 a 2.2 a 0.704 a 32900 a
21 August
Untreated 28.1 31.3 b 3.4 b 1.3 b 0.520 b 21500b
Kaolin   29.6 a 12.6 a 2.7 a 0.782 a 35000 a

Means followed by different letters are significantly different at the 0.05 probability level.

* Arbitrary units

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