SIGA — Triticum aestivum

Summary

TRAESCS4A02G157100, also known as TaABC1, SIGA or TaSIG2A-4A, encodes a sigma factor with DNA-directed RNA polymerase activity and transcription cis-regulatory region binding, placing it in the sigma-70 family of RNA polymerase initiation factors on wheat chromosome 4A. The gene is associated with photosystem stoichiometry adjustment, DNA-templated transcription initiation, and the hypersensitive response to stripe rust. It has been connected to numerous agronomic traits including leaf senescence rate, bread loaf volume, starch concentration, flag leaf area, grain number per plant, grain shattering, spike type, thousand kernel weight, grain hardness, heading date, and responses to stem rust, leaf rust, powdery mildew, and Hessian fly damage. Studies of related genes in other species link the family to leaf and chloroplast development and to salt and cold stress tolerance.