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Physiological and Isotopic Aspects of Photosynthesis in Peperomia¹

Department of Botany and Plant Sciences, University of California, Riverside, California 92521, Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, Archaeology Program, University of California, Los Angeles, California 90024

Physiological and isotopic aspects of several Peperomia species were investigated. All but one species had C₃-like stomatal behavior, in that stomata were open during the day and closed during the night. In these species, most atmospheric CO₂ uptake occurred during the day. Concurrent with this stomatal behavior, there were Crassulacean acid metabolism-like acid fluctuations in most species. Carbon and hydrogen isotope ratios of cellulose nitrate from Peperomia reflect their physiological behavior. The ¹³C values of cellulose nitrate from Peperomia species were similar to values observed in C₃ plants and consistent with the daytime uptake of exogeneous CO₂ via the C₃ photosynthetic pathway. The D values of cellulose nitrate from Peperomia species approach those of Crassulacean acid metabolism plants. These elevated D values are caused by fractionations occurring during biochemical reactions and not as a consequence of water relations.

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