CS1 — Oryza sativa Indica Group

Summary

BGIOSGA015546 (CS1/APX3) on chromosome 4 of Indica rice encodes an L-ascorbate peroxidase (EC 1.11.1.11), a haem peroxidase of the Ccp1-like family. The gene is associated with cellular oxidant detoxification, ROS metabolic processes, H₂O₂-mediated signaling, and glutathione metabolism. It has been linked to chloroplast-nucleus signaling, auxin metabolism, and cell cycle G2/M phase transition. Localisation evidence connects the product to the peroxisome membrane, chloroplast thylakoid and envelope, and stress granules. In rice, APX family members have been associated with drought, salt, cold, and bacterial blight stress responses, as well as plant growth, photosynthesis, leaf senescence, seed and fertility traits. Additional associations include submergence tolerance, cadmium concentration, flowering time, stomatal opening, and abscisic acid sensitivity. Studies of related genes in other species link the family to heat, high-light, and oxidative stress tolerance, as well as root development and flowering time.