RGA (HORVU.MOREX.R3.4HG0336620) — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.4HG0336620 (symbol RGA, also known as SLN1) on barley chromosome 4H encodes a DELLA protein, a member of the GRAS transcription factor family, with molecular functions including gibberellin binding, E-box binding, and phytochrome binding. The gene is associated with regulation of cellular response to heat, detection of light, raffinose family oligosaccharide biosynthesis, and upregulation of systemic acquired resistance. It is linked to traits such as leaf length-to-width ratio, linoleic and linolenic acid content, endosperm storage protein content, seed coat hardness, shoot elongation under submergence, flower number, and fruit ripening. The protein localises to the nucleus, plastid, and SCF complex, and participates in GA-GID1-DELLA signalling and hormone metabolism. Studies of related genes in other species connect the family to grain yield, salt stress tolerance, and gibberellic acid responsiveness.