TIP1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.4HG0407580 (HvTIP1) on barley chromosome 4H encodes a tonoplast intrinsic protein, a member of the aquaporin family, with water channel, urea transmembrane transporter, and channel activities. It is associated with protein storage, vacuole organization, porphyrin-containing compound metabolism, hydrogen peroxide membrane transport, detoxification, and responses to salt and osmotic stress. The gene has been linked to leaf development, polar cell growth, GA signaling, and chlorophyll anabolism. Localization evidence places the product at the tonoplast, protein storage vacuole, Golgi stack, and chloroplast envelope. Associations with seed growth and development, oleic acid content, and plant stress response traits have been reported. Studies of related genes in other species connect the family to water and urea transport, salt tolerance, drought response, grain size, and seed maturation.