Figure 2
From: Physiological responses to humic substances as plant growth promoter
Induction of lateral root emergence (A) and mitotic sites (B) by humic acids (HA) and auxins (IAA). See altered patter in elongation zone of maize seedlings treated w ith HA (A). Densely meristematic cells coloured by hematoxylin (B, adapted f rom Zandonadi et al. [15]).