CS1 — Oryza sativa Indica Group

Summary

BGIOSGA029361 (CS1, also known as OiCS1) on chromosome 9 of Indica rice encodes a haem peroxidase with L-ascorbate peroxidase activity (EC 1.11.1.11), placing it in the ascorbate peroxidase family. The gene is associated with diverse biological processes including cellular oxidant detoxification, H₂O₂-mediated signaling, ROS metabolism, chloroplast-nucleus signaling, and auxin metabolism. It has been linked to traits such as bacterial blight disease resistance, drought stress response, photosynthesis, plant growth and architecture, seed viability, flowering time, leaf senescence, and cadmium concentration. Localization evidence connects the product to the chloroplast thylakoid membrane, peroxisome membrane, and stress granules. Studies of related APX genes in rice associate the family with tolerance to abiotic stresses including drought, salt, cold, and high light, as well as with pathogen resistance and phytohormone responses.