Stomatal limitation to carbon gain in Paphiopedilum sp. (Orchidaceae) and its reversal by blue light
Leaves from Paphiopedilum sp. (Orchidaceae) having achlorophyllous stomata, show reduced levels of stomatal conductance when irradiated with red light, as compared with either the related, chlorophyllous genus Phragmipedium or with their response to blue light. These reduced levels of stomatal conductance, and the failure of isolated Paphiopedilum stomata to open under red irradiation indicates that the small stomatal response measured in the intact leaf under red light is indirect. The overall low levels of stomatal conductance observed in Paphiopedilum leaves under most growing conditions and their capacity to increase stomatal conductance in response to blue light suggested that growth and carbon gain in Paphiopedilum could be enhanced in a blue light-enriched environment. To test that hypothesis, plants of Paphiopedilum acmodontum were grown in controlled growth chambers under daylight fluorescent light, with or without blue light supplementation. Blue light enrichment resulted in significantly higher growth rates over a 3 to 4 week growing period, with all evidence indicating that the blue light effect was a stomatal response. Manipulations of stomatal properties aimed at long-term carbon gains could have agronomic applications.
- Research Organization:
- Stanford Univ., CA (United States)
- OSTI ID:
- 5886056
- Journal Information:
- Plant Physiol.; (United States), Vol. 77:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STOMATA
PHYSIOLOGY
CARBON DIOXIDE
CHLOROPLASTS
FLOWERS
LEAVES
PHOTOSYNTHESIS
PLANTS
VISIBLE RADIATION
CARBON COMPOUNDS
CARBON OXIDES
CELL CONSTITUENTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADIATIONS
SYNTHESIS
551000* - Physiological Systems