PPO1 — Cucumis sativus

Summary

CsPPO1 (CSA_5G128250) in cucumber (Cucumis sativus) encodes a protoporphyrinogen oxidase (EC 1.3.3.4) with oxygen-dependent protoporphyrinogen oxidase activity, FAD or FADH2 binding, and redox activity, placing it in the amine oxidase and FAD/NAD-binding superfamilies. The gene is associated with porphyrin-containing compound biosynthesis, heme anabolism, and terpene metabolism, and its product localizes to plastid thylakoid membranes, chloroplast inner membranes, and mitochondria. CsPPO1 has been linked to fruit fresh weight, fruit firmness, leaf chlorophyll content, carotenoid content, plant height, root length, and sugar content, as well as to seedling growth, embryo viability, seed set, pollen development, reactive oxygen species accumulation, and cell death. Studies of related genes in other species connect the family to drought tolerance, herbicide sensitivity, and enzymatic browning.