Abstract
Summary Carbon dioxide evolved by CAM plants (Aloe vera, Neoregelia sp. Sansevieria guineensis) in light (δ13C = 0.8 ± 1.8%) was significantly enriched in 13 C relative to that in dark (δ13C = -13.0 ± 1.4%). The changes in S 13C values of CO2 with light intensity revealed curves similar to those of photosynthetic rate versus light. The ratio of the amount of collected CO 2 C c over the amount of malic acid consumed (C m ) declined sharply from low light to about 95 µmol m −2 s −1 . Thereafter, this decline tended to be slow. The δ 13 C values of CO 2 evolved versus the corresponding C c /C m were linearly correlated, showing different slopes for each species, which is consistent with the expectations of the model established in this study. The yields of carbon dioxide for each malic acid decarboxylated evaluated from the model equation, termed N, were 3.0, 1.5, and 1.3 for S. guineensis, A. vera, Neoregelia sp., respectively.
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