TIP1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.3HG0330200 (symbol TIP1, preferred name HvTIP1) on barley chromosome 3H encodes a protein with an aquaporin-like domain and a major intrinsic protein (MIP) domain, and is annotated with water channel activity, urea transmembrane transporter activity, and channel activity. The gene is associated with protein storage, vacuole organization, leaf development, defense response, and response to salt and thirst. It has been linked to male fertility and pollen tube growth. Localization evidence places the product at the protein storage vacuole membrane and tonoplast. Studies of related genes in other species connect the TIP1 family to water and urea transport, drought sensitivity, water use efficiency, stomatal resistance, root length, seed germination, and nitrogen recycling, though these associations are not yet established in barley.