CKX1 — Oryza sativa Indica Group

Summary

BGIOSGA007803 (CKX1) on chromosome 2 of Indica rice encodes a cytokinin dehydrogenase (EC 1.5.99.12) with FAD-binding and oxidoreductase domains, and is associated with cytokinin breakdown and metabolism, 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, panicle number, grain shape, amylose content, heterosis, flowering time, disease tolerance, and chloroplast development. Studies of related genes in other species connect the family to root growth, salinity tolerance, disease resistance, and cytokinin degradation.