2014, 27(2): 265-269.
In order to study the photosynthetic characteristics of Dendrobium devonianum, the diurnal dynamics of photosynthesis and the response of photosynthetic rate to photosynthetic active radiation and CO2 were analyzed by LI-6400 portable photosynthesis analysis system under overshadow conditions. The results showed: (1) The diurnal variation of D. devonianum followed a double-peaks curve, there was obvious midday depression of photosynthesis. (2) The change rule of the response of photosynthetic rate to photosynthetic effective radiation and CO2 were similar, the critical points of light compensation and saturation of D. devonianum were 4.4 and 182.5 μmol·m-2·s-1, respectively; the apparent quantum efficiency was 0.03 mol·mol-1. Its CO2 compensation point and saturation point were 162.5 and 1 240.25 μmol·m-2·s-1, respectively; its carboxylation efficiency was 0.004. (3) D. devonianum, as the same as other Dendrobium plants, belong to shade plants, therefore, shading and temperature and humidity controlling are needed in the cultivation and management.
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