Character istics of Photosynthesis in Three DendrobiumSpecies with Ten CultureMedia

WANG Yan; SUN Ye; LI Zhen-jian; YUE Hua

The experiments were made with Den. crepidatum, Den. chrysotoxum and Den. trigonopus. Thephotosynthesis and transp iration rate of three Dend robium species p lanted in ten media were tested. The resultsshowed that three Dendrobium species performed great differences in photosynthesis with same culture medium.Photosynthesis rate of Den. chrysotoxum was better than that ofDen. crepidatum ,which was better than that ofDen.trigonopus. There also exists difference in transp iration rate among the three species. The transp iration rate ofDen.crepidatum was the highest, followed by Den. chrysotoxum , and Den. trigonopus was the least. The photosynthesiswas difference in different culture media with same Dend robium species. The best culture medium of Den.crepidatum and Den. trigonopus was orchid stone with the highest photosynthesis of 4. 788 μmol·m-2 · s-1 and2. 640μmol·m-2 ·s-1. The best culture medium ofDen. ch rysotoxum was orchid stone ∶tree bark (1∶1) with thehighest photosynthesis 6μmol·m-2·s-1.

1. Research Institute of Forestry, CAF

2. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing　100091, China

Received Date: 2007-05-18

Abstract: The experiments were made with Den. crepidatum, Den. chrysotoxum and Den. trigonopus. Thephotosynthesis and transp iration rate of three Dend robium species p lanted in ten media were tested. The resultsshowed that three Dendrobium species performed great differences in photosynthesis with same culture medium.Photosynthesis rate of Den. chrysotoxum was better than that ofDen. crepidatum ,which was better than that ofDen.trigonopus. There also exists difference in transp iration rate among the three species. The transp iration rate ofDen.crepidatum was the highest, followed by Den. chrysotoxum , and Den. trigonopus was the least. The photosynthesiswas difference in different culture media with same Dend robium species. The best culture medium of Den.crepidatum and Den. trigonopus was orchid stone with the highest photosynthesis of 4. 788 μmol·m-2 · s-1 and2. 640μmol·m-2 ·s-1. The best culture medium ofDen. ch rysotoxum was orchid stone ∶tree bark (1∶1) with thehighest photosynthesis 6μmol·m-2·s-1.

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Reference (14)

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Character istics of Photosynthesis in Three DendrobiumSpecies with Ten CultureMedia

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