CKX1 — Oryza sativa Indica Group

Summary

BGIOSGA020998 (CKX1) on chromosome 6 of Indica rice encodes a cytokinin dehydrogenase with FAD binding and redox activity, and is also annotated with phosphoglycerate transmembrane transporter and antiporter activities. The gene is associated with cytokinin breakdown, metabolism and signaling, as well as meristem and inflorescence development, stomatal complex morphogenesis, and phosphoenolpyruvate transport. In this species, CKX1 has been linked to grain yield, grain number, thousand grain weight, root and shoot development, photosynthesis, leaf senescence, salt and drought tolerance, and abscisic acid responses. Additional associations include panicle number, spikelet number, grain shape and size, plant height, flowering time, seed shattering, heterosis, and disease tolerance. The protein is predicted to localize to plastid inner membrane, chloroplast envelope, ER, vacuole, cytosol, and nucleus. Studies of related genes in other species connect the family to root growth, flowering, salinity tolerance, and fruit ripening.