The modulus of elasticity in bending, E, (solid lines) and the specific conductivity, Ks, (dashed lines) of the woody tissue of the lateral roots shown as a function of the distance from the bole. The trend-lines are shown for the buttressed tree species Tachigali melinonii (black) and Xylopia nitida (grey), and are based on data presented in Christensen-Dalsgaard, et al, 2007a.