The first carbon dioxide acceptor in C4 plants is A Phosphoenol-pyruvate B Ribulose 1, 5-diphosphate C Oxaloacetic acid D Phosphoglyceric acid
Option A. The initial acceptor of carbon dioxide is phosphoenol pyruvic acid (PEP) and the initial carboxylating enzyme is PEP carboxylase. The initial carboxylation reaction occurs in the mesophyll cells. In the C4 organic acids are decarboxylated in the bundle sheath cells to release carbon dioxide.
