Fig. 7.

The intercept (A) and a combined stomatal conductance × VPD coefficient (B) as a function of leaf temperature. These coefficients (mean ± SE, N = 9) were derived from a general linear multiplicative model fitted to the seasonal rates of transpiration for all Semillon leaves, shoots and vines growing in an irrigated vineyard during the 2008/09 growing season for each separate temperature band between 20 and 45 °C. The model used stomatal conductance and the VPD that was measured concurrently with each transpiration rate as the parameters in the general linear model. The model was fitted separately to the data for each vine and replicate, and the coefficients were then averaged accordingly.