ACC4 — Cucumis melo

Summary

MELO3C007662.2 (CmACC4) on melon chromosome 9 encodes a 1-aminocyclopropane-1-carboxylate synthase, an enzyme with pyridoxal phosphate-dependent transaminase activity that catalyzes a key step in ethylene biosynthesis. The gene is associated with sex determination and female flower development in melon. It is linked to the regulation of ethylene biosynthesis, responses to organophosphorus compounds and potassium ion starvation, and negative regulation of ethylene signaling. Associations extend to fruit ripening, fruit shape and elongation, yield, photosynthetic rate, respiration, leaf senescence, flowering time, root growth and hydrotropism, lateral root number, seed mucilage structure, cell wall biogenesis and integrity, osmotic tolerance, hypoxia response, and bacterial disease response. The protein localizes to the cell wall, vacuole, plastid, plasmodesma, and other compartments. Studies of related genes in other species connect the family to additional processes including female flowering, fruit size, disease resistance, and iron acquisition.