Effect of carbon dioxide-enrichment on tobacco
Three-wk old seedlings of tobacco variety Bell-W3 and Bell-B were grown in growth chambers under sunlight and subjected to 3 levels of ambient CO2 concentrations: 300-315 (low), 350-400 (medium) and 600-700 (high) umol mol-1.Weekly measurements of rates of photosynthesis, respiration, transpiration...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Malaysian Society of Plant Physiology
1990
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| Online Access: | http://psasir.upm.edu.my/id/eprint/47355/1/Effect%20of%20carbon%20dioxide-enrichment%20on%20tobacco.pdf http://psasir.upm.edu.my/id/eprint/47355/ |
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| Institution: | Universiti Putra Malaysia |
| Language: | English |
| Summary: | Three-wk old seedlings of tobacco variety Bell-W3 and Bell-B were grown in growth chambers under sunlight and subjected to 3 levels of ambient CO2 concentrations:
300-315 (low), 350-400 (medium) and 600-700 (high) umol mol-1.Weekly measurements of rates of photosynthesis, respiration, transpiration, diffusive resistance and chlorophyll content were taken for 5 wks after which plants were harvested for dry matter yield estimations. Photosynthetic and respiratory rates showed a trend for a quadratic increase with increasing CO2 levels. Variety Bell-W3 had a 27% greater rate of photosynthesis and 12% greater chlorophyll content than variety Bell-B. Variety Bell-W3 also showed a 50% increase in total yield at the high CO2 compared to the medium and low CO2 treatments. No differences in yield was obtained for variety Bell-B. The differences in response between the two varieties may be associated with their inherent photosynthetic capacity. |
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