CS1 — Sorghum bicolor

Summary

SbCS1 (SORBI_3007G205600) on sorghum chromosome 7 encodes a haem peroxidase of the Ccp1-like family with L-ascorbate peroxidase activity (EC 1.11.1.11). The gene is associated with cellular oxidant detoxification, H2O2-mediated signaling, water homeostasis, and auxin metabolism. It has been linked to numerous agronomic traits including water-use efficiency, photosynthetic rate, stomatal resistance, flowering time, seed viability, leaf senescence, and bacterial blight disease resistance. The encoded protein localizes to multiple cellular compartments including the peroxisome membrane, chloroplast thylakoid, and stress granules. Studies of related genes in other species connect the family to drought stress tolerance, heat stress memory, photoprotection, and pathogen resistance, though these associations are not yet established for sorghum.