Figure 7.

Schematic illustration of the intrinsic relationship between ROS production, ROS scavenging, and ROS homeostasis for regulating PPD in cassava storage roots. Exposure to oxygen or mechanical wounding during harvest leads to increased ROS production in the storage root. Inefficient endogenous ROS scavenging results in excess ROS, which triggers rapid PPD responses, and stable ROS homeostasis in harvested cassava roots is never achieved. Ectopic expression of SOD and CAT leads to timely scavenging of excess ROS, thereby keeping the ROS homeostasis balanced and delaying PPD occurrence. [See online article for color version of this figure.]