Abstract
Most of the species in the genus Clusia are very flexible in their photosynthetic pathway, and are C 3 -photosynthesis/Crassulacean acid metabolism (CAM) intermediate species; therefore, the identification and clear assignment of Clusia -species to C 3 - or CAM-pathways is difficult. We made an attempt to characterize obligate C 3 -photosynthesis species within that genus. Therefore, we selected five species of the family Clusiacea (four of the genus Clusia and one of the genus Oedematopus ) on the basis of their low leaf succulence as potential obligate C 3 -photosynthesis species. All of them showed a C 3 -photosynthesis pattern of gas exchange under well-watered conditions and their δ 13 C-values were also found to be in the range of obligate C 3 -photosynthesis plants. Under drought stress two of them ( C. articulata and C. cruiva ) proved to be C 3 -photosynthesis/CAM intermediate species, while C. parviflora, C. multiflora and most likely O. mirandensis did not show any nocturnal CO 2 -fixation. However, in C. parviflora and O. mirandensis some nighttime accumulation of malate by internal CO 2 -recycling might occur. So far, C. multiflora seems to be the only known Clusia species with neither nocturnal net CO 2 -uptake nor malate accumulation.
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