RAC1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.1HG0077700 (HvRAC1) on barley chromosome 1H encodes a small GTPase of the Rho family, with annotated GDP-binding, GTPase-binding, and multiple prenyltransferase activities. The gene is associated with regulation of calcium-mediated signaling, cytoskeleton organization, cell polarity establishment, and phragmoplast assembly. HvRAC1 has been linked to susceptibility to powdery mildew in barley and to traits including seed yield, plant dry weight, root hair length, lateral root number, cadmium and arsenic concentration, abscisic acid concentration, and responses to phosphorus, ethylene, brassinosteroids, and abiotic stress. Localization evidence connects the product to the cell projection, pollen tube tip, filiform apparatus, and site of polarized growth. Related genes in other species link the family to disease resistance, cell death, fertility, grain yield, and salt tolerance.