FIGURE 2.

Histochemical detection of H₂O₂ in germinating quinoa. Seeds were placed for 20 h directly into DAB (1 mg/ml in water) directly (left) or after 4 h imbibition in water (right). Brown precipitates indicate the presence of hydrogen peroxide. Some heterogeneity exists in H₂O₂ contents and distribution; therefore data of three independent staining experiments are shown.