ACC4 — Lactuca sativa

Summary

LsACC4, encoded by the ACC4 gene on lettuce chromosome 4, is a 1-aminocyclopropane-1-carboxylate synthase, an enzyme with pyridoxal phosphate-dependent transaminase activity. It is associated with the regulation of ethylene biosynthesis, including negative regulation, and with responses to organophosphorus, potassium ion, and nitrogen starvation. The gene is linked to numerous traits such as yield, leaf length, root hair length, lateral root number, root thickness, root mass density, photosynthetic rate, respiration rate, flowering time, fruit ripening, anthocyanin content, and responses to bacterial disease, low temperature, and arsenic. It is also connected to phenotypes including ethylene production, root growth, cell wall biosynthesis, seed mucilage structure, and auxin response. Studies of related genes in other species link the family to sex determination, disease resistance, and freezing tolerance.