RGA (TRAESCS4B02G043100) — triticum aestivum

Summary

TaRGA (TRAESCS4B02G043100) on bread wheat chromosome 4B encodes a DELLA protein, a member of the GRAS transcription factor family, and is the product of the Rht-B1 locus. The protein exhibits gibberellin binding, phytochrome binding, and E-box binding activities, and is associated with diverse molecular functions including SUMO-specific endopeptidase and phosphorelay sensor kinase activities. TaRGA is linked to regulation of cellular response to heat, trichome morphogenesis, inflorescence phyllotactic patterning, and detection of light. It is associated with traits including grain number, grain dormancy, leaf length-to-width ratio, linoleic and linolenic acid content, endosperm storage protein content, seed coat hardness, and shoot elongation under submergence. The gene is also associated with root length, salt and jasmonic acid responses, and localises to the nucleus, plastid, mitochondria, and plasmodesmata. Studies of related genes in other species link the DELLA family to grain yield, plant height, dwarfism, tillering, and gibberellic acid responsiveness.