CKX1 — Oryza sativa Japonica

Summary

Os01g0197700 (CKX1, also known as Gn1a) in rice encodes a cytokinin dehydrogenase, an enzyme with FAD binding and oxidoreductase activity that catalyzes cytokinin breakdown. This gene is associated with grain yield, grain number per panicle, thousand grain weight, and panicle and inflorescence development. It has been linked to root system architecture, crown root number, shoot and meristem development, and responses to salt, drought, and osmotic stress. Associations also include cytokinin homeostasis and signaling, auxin response, leaf senescence, and tissue homeostasis. The encoded protein is localized to plastids, chloroplast envelope, ER lumen, vacuole, cytosol, and nucleus. Studies of related genes in other species link the CKX family to root growth, flowering, salinity tolerance, and disease resistance.