CO2 enrichment increased leaf initiation and photosynthesis in Doritaenopsis Queen Beer 'Mantefon' orchids
2018
Yun, D.L., Seoul Women's University, Seoul, Republic of Korea | Kim, H.J., National Institute of Biological Resources, Ministry of Environment, Incheon, Republic of Korea | Kim, Y.J., Seoul Women's University, Seoul, Republic of Korea
The plants have potential on carbon sink because plants absorb carbon dioxide (CO₂) in ambient and use that for photosynthesis. CO₂ enrichment, which is a commonly used technique in vegetable culture, may gain importance in ornamental production, potentially shortening the growth period. However, compared with forests and crop plants, the studies of CO₂ enrichment on orchids are relatively limited. This study was undertaken to investigate the efects of elevated CO₂ concentrations on leaf initiation and photosynthesis in the orchid Doritaenopsis Queen Beer 'Mantefon'. Leaf growth and photosynthetic characteristics were measured in the plants grown under 450 (ambient control), 800, and 1600 μmol mol−¹ CO₂ during the latter 6 h of the dark period for 36 weeks. The number of leaves increased with the elevated CO₂ concentration, and the time to leaf initiation decreased with elevated CO₂ concentration. However, leaf span and biomass was lower in the plants grown under the higher CO₂ concentrations compared to the plants grown under ambient CO₂. Maximum net CO₂ uptake, transpiration rate, and stomatal conductance were higher in the plants grown under 1600 μmol mol−¹ CO₂ than in the plants grown under 450 μmol mol−¹ CO₂. The 800 and 1600 μmol mol−¹ CO₂ concentrations accelerated leaf initiation and net CO₂ uptake. We found that concentrations of CO₂ in the 800 and 1600 μmol mol−¹ CO₂ range were controlled for growth of Doritaenopsis orchids.
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