PEP is CO₂ acceptor in

PEP is a CO₂ acceptor in the C₄ plant.
C₄ carbon fixation is one of three known photosynthetic processes of carbon fixation in plants.
CO₂ is initially fixed in the mesophyll cells by the enzyme PEP carboxylase which reacts the three-carbon phosphoenolpyruvate (PEP) with CO₂ to form the four-carbon oxaloacetic acid (OAA). Thus, PEP is the first acceptor of CO₂ in C₄ plants.