FIGURE 1.

Cross section of sorghum internode, with identification of an outer (Z1) and a central (Z2) zone. Z1 is characterized by its area in % of internode section area (perZ1), the percentage of sclerenchyma tissue (red stained) in % of Z1 area (perSclZ1); Z2 is characterized by its area in % of internode section area, the percentage of blue tissue in percentage of Z2 area (perBluZ2), the density of vascular bundles in Z2 in number of vascular bundles per mm² (densVBZ2). Example of G1 (Biomass140) in the well-watered treatment in 2013. Coloration by Fasga.