Abstract
Summary Dark respiration rates of leaf slices of five species of Talinum (Portulacaceae) did not significantly correlate with nocturnal increases in leaf malic-acid concentrations. Thus, respiration rate does not appear to be the primary limiting factor regarding the degree of nocturnal malic acid accumulation in plants exhibiting CAM-cycling. Instead, these findings support the possibility that the biochemical capacity for CAM limits the amount of malic acid synthesized at night during CAM-cycling.
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