Fig. 2From: Comparative physiological and transcriptomic analysis reveal MdWRKY75 associated with sucrose accumulation in postharvest ‘Honeycrisp’ apples with bitter pitThe changes of reactive oxygen species (ROS) in postharvest healthy apples and calcium deficiency apples. A hydrogen peroxide, B superoxide anion, C malondialdehyde and D the activity of polyphenol oxidase. Data are presented as means ± SD (n = 3). Different lower-case letters above the columns stand for significant difference between two values (p < 0.05) at the same time pointBack to article page