Abstract:The photosynthetic pathway of 10 cultivars of 7 species in Cymbidium were studied. The results showed that in Cymbidium leaves, the activities of phosphoenolpyruvate carboxylase (PEPCase) and pyruvate phosphate dikinase (PPDK) were very low, but the activity of glycolate oxidase was rather high. The glycolate content in the leaves treated with α-hydroxypyridine methane sulfonate (α-HPMS) was obviously higher than that of control under the light. Chlorophyll a/b ratios in these cultivars were between 1.24 an...