Fig. 2From: Hydrogen cyanamide breaks grapevine bud dormancy in the summer through transient activation of gene expression and accumulation of reactive oxygen and nitrogen speciesLevels of H2O2 in the control, P, HC and PHC treated buds. Hydroperoxide was assayed by the ferric-xylenol orange (Fe-XO) complex [62]. After incubation in the dark for 30 min, the absorbance was read at 560 nm with 100 μM xylenol orange as blankBack to article page