CO2 enrichment increased leaf initiation and photosynthesis in Doritaenopsis Queen Beer ‘Mantefon’ orchids
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 effects 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.
KeywordsCO2 uptake Developmental stages Leaf initiation Orchid Ornamental plants
This work was carried out with the support by a research grant from Seoul Women’s University (2017), ‘Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ012069)’ Rural Development Administration, Republic of Korea, and a grant (NRF-2015R1C1A1A02037704) from the National Research Foundation of Korea.
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