TCA cycle flux. Evolution of 14CO2 of BRZ treated plants at day 6 when incubated with labelled glucose. Plants were grown and harvested as described in Figure 1. A, Leaf discs were incubated with [3:4-14C]-glucose. B, Leaf discs were incubated with [1-14C] -glucose. Data are given as mean ± SE (n =5 pools of leaf discs from 10 plants).