Leaf thickness. Plants were grown and harvested as described in Figure 1. Thickness of the leaves three and four was measured using transversal sections. Values are given as mean ± SE. 20 leaves were analysed per point in time. Values denoted with an asterisk are significantly different from the wild type (C24) or control (t test, P <0.05). A, Leaf thickness of wild-type (C24), CPD-antisense, and cbb1 plants. B, Leaf thickness of BRZ treated plants.