CS1 — Oryza sativa Indica Group

Summary

BGIOSGA012372 (CS1/APX1) on chromosome 3 of Indica rice encodes an L-ascorbate peroxidase (EC 1.11.1.11) belonging to the haem peroxidase family, with additional annotated molecular functions including p-coumarate 3-hydroxylase activity, siRNA binding, and ubiquitin ligase substrate adaptor activity. The gene is associated with cellular oxidant detoxification, ROS metabolism, H₂O₂-mediated signaling, chloroplast-nucleus signaling, auxin metabolism, and cell cycle G2/M phase transition. It localizes to the chloroplast thylakoid, peroxisome membrane, and stress granules. Phenotypic associations in rice link the family to blight and bacterial blight resistance, drought and salt stress tolerance, photosynthesis, plant growth and architecture, seed and seedling traits, cold stress, senescence, and gall midge resistance. Related genes in other species are associated with salt, heat, oxidative, and high-light stress tolerance, root development, and hydrogen peroxide accumulation.