Comparative Study on Photosynthesis between Three Dendrobia and Kalancho(e) Daigremontiana
In the family of orchidaceae, dendrobium is a big genus, and some species performed crassulacean acid metab-olism(CAM) in their carbon assimilation. To testify the pathways of carbon assimilation among dendrobia, the typical obligate CAM plant named Kalanchoedaigremontiana was selected as control. The results showed that, the light saturation point of D. Primulinum was 700 pimolphoton · M-2 · S-1, and the maximum photosynthetic rate was 3. 826 μmolCO2 · M-2 · S-1. The diurnal change of photosynthesis in D. Primulinum was composed by four distinct phases. The light saturation point of D. Chrysotoxum was 900 μmolphoton · M-2 · S-1, and maximum photosynthetic rate was high and up to 5. 912 fimolCO2 · M-2 · S-1, while the diurnal change of photosynthesis showed single summit at noon, which meant that D. Chrysotoxum did not show the characteristics of CAM plant. For D. Nobile, it preferred to shade environment, whose diurnal change of photosynthesis exhibited double summits with declining to some extent at noon when illumination was intensive.
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