Photosynthetic inhibition after long-term exposure to elevated levels of atmospheric carbon dioxide |
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Authors: | Evan H Delucia Thomas W Sasek Boyd R Strain |
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Institution: | (1) Department of Botany, Duke Univrsity, 27706 Durham, North Carolina, USA |
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Abstract: | The effect of long-term exposure to elevated levels of CO2 on biomass partitioning, net photosynthesis and starch metabolism was examined in cotton. Plants were grown under controlled conditions at 350, 675 and 1000 l l-1 CO2. Plants grown at 675 and 1000 l l-1 had 72% and 115% more dry weight respectively than plants grown at 350 l l-1. Increases in weight were partially due to corresponding increases in leaf starch. CO2 enrichment also caused a decrease in chlorophyll concentration and a change in the chlorophyll a/b ratio. High CO2 grown plants had lower photosynthetic capacity than 350 l l-1 grown plants when measured at each CO2 concentration. Reduced photosynthetic rates were correlated with high internal (non-stomatal) resistances and higher starch levels. It is suggested that carbohydrate accumulation causes a decline in photosynthesis by feedback inhibition and/or physical damage at the chloroplast level.Abbreviations Ci
internal CO2 concentration
- Chl
chlorophyll
- DMSO
dimethylsulfoxide
- HSD
honestly significant difference (procedure)
- MCW
methanolchloroform-water
- Pi
inorganic phosphate
- S.E.M.
standard error of mean |
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Keywords: | CO2-enrichment conductance cotton photosynthesis starch accumulation |
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