CKX1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.3HG0236930, designated HvCKX1 on barley chromosome 3H, encodes a cytokinin dehydrogenase (EC 1.5.99.12) with FAD binding and oxidoreductase activity. The gene is associated with cytokinin breakdown and signaling, meristem and inflorescence development, seed development, and immune and defense responses. HvCKX1 has been linked to root surface area and root hair number in barley, as well as to tiller number, plant height, flowering time, photosynthetic rate, leaf morphology, chloroplast development, and disease tolerance. The encoded protein localises to plastids, chloroplast envelope, ER lumen, vacuole, cytosol, and nucleus. Studies of related genes in other species connect the CKX family to grain number, yield, root and shoot development, salinity tolerance, and senescence.