CKX1 — Oryza sativa Indica Group

Summary

BGIOSGA000724 (CKX1) on chromosome 1 of Indica rice encodes a cytokinin dehydrogenase (EC 1.5.99.12) with FAD-binding and oxidoreductase domains. The gene is associated with cytokinin breakdown and signaling, meristem and inflorescence development, and phosphoglycerate transport. In rice, CKX1 family members have 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. Additional associations include seed shattering, grain shape and size, amylose content, panicle number and length, flowering time, disease tolerance, heterosis, and chloroplast development. Studies of related genes in other species connect the family to root growth, salinity tolerance, disease resistance, and tuber dormancy.