The Role of Phosphoenolpyruvate Carboxylase during C^sub 4^ Photosynthetic Isotope Exchange and Stomatal Conductance1[OA] From: Plant Physiology | Date: November 1, 2007| Author: Cousins, Asaph B; Baroli, Irene; Badger, Murray R; Ivakov, Alexander; Lea, Peter J; Leegood, Richard C; Caemmerer, Susanne von | Copyright American Society of Plant Biologists Nov 2007. Provided by ProQuest LLC.Copyright information

Phosphoenolpyruvate carboxylase (PEPC; EC 4.1.1.31) plays a key role during C^sub 4^ photosynthesis and is involved in anaplerotic metabolism, pH regulation, and stomatal opening. Heterozygous (Pp) and homozygous (pp) forms of a PEPC-deficient mutant of the C^sub 4^ dicot Amaranthus edulis were used to study the effect of reduced PEPC activity on CO2 assimilation rates, stomatal conductance, and ^sup 13^CO2 (Δ^sub 13^C) and C^sup 18^OO (Δ^sup 18^O) isotope discrimination during leaf...