CKX1 — Oryza sativa Indica Group

Summary

BGIOSGA019749 (CKX1, OiCKX1) on chromosome 5 of indica rice encodes a cytokinin dehydrogenase (EC 1.5.99.12) with FAD-binding and oxidoreductase domains, and is also annotated for phosphoglycerate transmembrane transporter and antiporter activities. The gene is associated with cytokinin breakdown and signaling, meristem and inflorescence development, and grain yield, grain number, thousand grain weight, and panicle and spikelet traits in this species. It has been linked to root, shoot, leaf, and stem development, as well as to photosynthesis, leaf senescence, and responses to salt, drought, and abscisic acid. Additional associations include seed shattering, grain shape, amylose content, plant height, flowering time, disease tolerance, and heterosis. Studies of related genes in other species link the family to root growth, flowering, salinity tolerance, and cytokinin degradation.