RGA — Triticum aestivum

Summary

TRAESCS4D02G040400 (symbol RGA, also known as Rht1 and TaRGL1-4D) on wheat chromosome 4D encodes the DELLA protein Rht-D1, a member of the GRAS transcription factor family. The product is associated with gibberellin binding, E-box binding, and phytochrome binding, and has been linked to Fusarium head blight resistance in bread wheat. The gene is associated with numerous biological processes including regulation of cellular response to heat, inflorescence phyllotactic patterning, raffinose family oligosaccharide biosynthesis, and singlet oxygen-mediated programmed cell death. It localizes to the SCF complex, nuclear body, plasmodesma, and plastid. Associations with agronomic traits include grain number, grain dormancy, spike exsertion, leaf length-to-width ratio, root length, and salt and submergence responses. Studies of related genes in other species link the family to grain yield, plant height, tillering, and gibberellic acid responsiveness.