CKX1 — Oryza sativa Japonica

Summary

OS01G0940000 (CKX1/CKX4) encodes a cytokinin dehydrogenase (EC 1.5.99.12) with FAD binding and oxidoreductase activity, belonging to the cytokinin dehydrogenase FAD/cytokinin-binding domain family. In rice, this gene is associated with cytokinin breakdown and signaling, auxin response, meristem and inflorescence development, shoot regeneration, and tissue homeostasis. It is linked to grain number, yield, panicle architecture, plant height, tiller number, grain size and weight, root system architecture, crown root number, leaf morphology, salt and drought tolerance, and stress responses. The encoded protein localizes to plastids, chloroplast envelope, ER lumen, vacuole, and cytosol. Studies of related genes in other species link the family to root growth, flowering, salinity tolerance, and disease resistance, and to cytokinin degradation.