Abstract |
To examine the effectiveness of super-elevated (10,000 micromol mol(-1)) CO(2) enrichment under cold cathode fluorescent lamps (CCFL) for the clonal propagation of Cymbidium, plantlets were cultured on modified Vacin and Went (VW) medium under 0, 3,000 and 10,000 micromol mol(-1) CO(2) enrichment and two levels of photosynthetic photon flux density (PPFD, 45 and 75 micromol m(-2) s(-1)). Under high PPFD, 10,000 micromol mol(-1) CO(2) increased root dry weight and promoted shoot growth. In addition, a decrease in photosynthetic capacity and chlorosis at leaf tips were observed. Rubisco activity and stomatal conductance of these plantlets were lower than those of plantlets at 3,000 micromol mol(-1) CO(2) under high PPFD, which had a higher photosynthetic capacity. On the other hand, plantlets on Kyoto medium grown in 10,000 micromol mol(-1) CO(2) under high PPFD had a higher photosynthetic rate than those on modified VW medium; no chlorosis was observed. Furthermore, growth of plantlets, in particular the roots, was remarkably enhanced. This result indicates that a negative response to super-elevated CO(2) under high PPFD could be improved by altering medium components. Super-elevated CO(2) enrichment of in vitro-cultured Cymbidium could positively affect the efficiency and quality of commercial production of clonal orchid plantlets.
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Authors | Atsushi Norikane, Takejiro Takamura, Masahiro Morokuma, Michio Tanaka |
Journal | Plant cell reports
(Plant Cell Rep)
Vol. 29
Issue 3
Pg. 273-83
(Mar 2010)
ISSN: 1432-203X [Electronic] Germany |
PMID | 20094885
(Publication Type: Journal Article)
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Chemical References |
- Culture Media
- Carbon Dioxide
- Ribulose-Bisphosphate Carboxylase
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Topics |
- Carbon Dioxide
(metabolism)
- Culture Media
- Light
- Orchidaceae
(growth & development, metabolism, radiation effects)
- Photosynthesis
- Plant Roots
(growth & development)
- Plant Shoots
(growth & development)
- Plant Stomata
- Ribulose-Bisphosphate Carboxylase
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