CKX1 — Oryza sativa Indica Group

Summary

BGIOSGA005140 (CKX1) in Indica rice encodes a cytokinin dehydrogenase (EC 1.5.99.12), a FAD-binding oxidoreductase associated with cytokinin breakdown. The gene is associated with cytokinin metabolism and signalling, meristem and inflorescence development, and phosphoglycerate transport. In rice, CKX1 has been linked to grain yield, grain number, thousand grain weight, panicle and spikelet traits, root and shoot development, leaf senescence, photosynthesis, and responses to salt, drought and abscisic acid. It is also associated with seed shattering, grain shape, amylose content, flowering time, disease tolerance, heterosis, and chloroplast development. The protein localises to plastids, chloroplast envelope, ER lumen, vacuole, cytosol and nucleus. Studies of related genes in other species link the CKX family to root growth, salinity tolerance, disease resistance, fruit ripening, and tuber dormancy.