Photosynthesis-related characteristics of the midrib and the interveinal lamina in leaves of the C₃–CAM intermediate plant<i>Mesembryanthemum crystallinum</i>

Abstract

The metabolic roles of midrib chloroplasts differ in C3 and CAM plants. It is suggested that in leaves of C3 plants the midrib chloroplasts could be involved in the supply of CO2 for carboxylation, and in CAM plants they could provide malate to different metabolic processes and mediate H2O2 signalling.