Photosynthetica 2003, 41(4):597-603 | DOI: 10.1023/B:PHOT.0000027526.48604.09

Gas Exchange of Carrot Leaves in Response to Elevated CO2 Concentration

S. Kyei-Boahen1,2, T. Astatkie3, R. Lada1,*, R. Gordon3, C. Caldwell1
1 Department of Plant and Animal Sciences, Nova Scotia Agricultural College, Truro, Canada
2 Delta Research and Extension Center, Mississippi State University, Stoneville, USA
3 Department of Engineering, Nova Scotia Agricultural College, Truro, Canada

Short-term responses of four carrot (Daucus carota) cultivars: Cascade, Caro Choice (CC), Oranza, and Red Core Chantenay (RCC) to CO2 concentrations (Ca) were studied in a controlled environment. Leaf net photosynthetic rate (PN), intercellular CO2 (Ci), stomatal conductance (gs), and transpiration rate (E) were measured at Ca from 50 to 1 050 μmol mol-1. The cultivars responded similarly to Ca and did not differ in all the variables measured. The PN increased with Ca until saturation at 650 μmol mol-1 (Ci= 350-400 μmol mol-1), thereafter PN increased slightly. On average, increasing Ca from 350 to 650 and from 350 to 1 050 μmol mol-1 increased PN by 43 and 52 %, respectively. The PNvs.Ci curves were fitted to a non-rectangular hyperbola model. The cultivars did not differ in the parameters estimated from the model. Carboxylation efficiencies ranged from 68 to 91 μmol m-2 s-1 and maximum PN were 15.50, 13.52, 13.31, and 14.96 μmol m-2 s-1 for Cascade, CC, Oranza, and RCC, respectively. Dark respiration rate varied from 2.80 μmol m-2 s-1 for Oranza to 3.96 μmol m-2 s-1 for Cascade and the CO2 compensation concentration was between 42 and 46 μmol mol-1. The gs and E increased to a peak at Ca= 350 μmol mol-1 and then decreased by 17 and 15 %, respectively when Ca was increased to 650 μmol mol-1. An increase from 350 to 1 050 μmol mol-1 reduced gs and E by 53 and 47 %, respectively. Changes in gs and PN maintained the Ci:Ca ratio. The water use efficiency increased linearly with Ca due to increases in PN in addition to the decline in E at high Ca. Hence CO2 enrichment increases PN and decreases gs, and can improve carrot productivity and water conservation.

Keywords: CO2 compensation concentration; cultivar differences; Daucus carota; net photosynthetic rate; nonlinear regression model; stomatal conductance; transpiration rate; water use efficiency

Published: December 1, 2003Show citation

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Kyei-Boahen, S., Astatkie, T., Lada, R., Gordon, R., & Caldwell, C. (2003). Gas Exchange of Carrot Leaves in Response to Elevated CO2 Concentration. Photosynthetica, 41(4), 597-603. doi: 10.1023/B:PHOT.0000027526.48604.09.
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