SAP1 — Triticum aestivum

Summary

TRAESCS5B02G262900 (TaSAP1) on wheat chromosome 5B encodes a zinc-finger A20 and AN1 domain-containing stress-associated protein with ubiquitin-protein transferase activity, microtubule binding, DNA binding, and protein homodimerization activity. In bread wheat, TaSAP1 is associated with grain yield, and its expression has been linked to responses to biotic stimuli, stress-activated MAPK cascades, defense response by callose deposition, regulation of systemic acquired resistance, innate immune response, hydrogen peroxide metabolism, and respiratory burst. The protein localizes to the chloroplast envelope and stroma, plant-type vacuole, plastid, mitochondria, cytosol, plasmalemma, cytoplasm, and nucleus. TaSAP1 is also associated with traits including reproductive period, grain protein content, harvest index, spike length, tiller number, stripe rust resistance, heat tolerance, water use efficiency, and seed size. Studies of related genes in other species link the family to salt, drought, and heat stress tolerance, as well as yield and virus resistance.