The redox state of the low molecular-weight antioxidants may modulate the degree of cell proliferation. CAT and APX play major roles in restoring the ROS homeostasis. SOD and GR work at the first and the last step, respectively, of the ascorbate-glutathione cycle scavenging ROS in plant cells. Glutathione disulfide (GSSG) produced in the process is then recycled to glutathione (GSH)