Fig. 1

Paraffin infiltrated leaves cross-sectioned at 10 μM thickness. a. Brassica oleracea (n=9). b. B. carinata (n=17). We defined 1000 μM long sections of leaf (inside the black boxes) that avoided major veins. All measurements occur inside these boundaries. Palisade parenchyma is defined as any tissue above the mid-line of minor veins and below the adaxial epidermis. Spongy mesophyll is defined as any tissue below the mid-line of minor veins and above the abaxial epidermis. All areas refer to predefined 1000 μM long leaf sections. Scale bars are 500 µM