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Title: Effect of root-zone (RZ) CO2, on productivity and photosynthesis in aeroponically grown lettuce plants
Authors: He, Jie
Austin, P. T.
Nichols, Michael A.
Lee, Sing Kong
Keywords: Leaf area
CO2 assimilation
Shoot and root weight
Stomatal conductance
Issue Date: 2004
Citation: He, J., Austin, P. T., Nichols, M. A., & Lee, S. K. (2004). Effect of root-zone (RZ) CO2, on productivity and photosynthesis in aeroponically grown lettuce plants. Acta Horticulturae, 648, 39-45.
Abstract: Effects of root-zone (RZ) CO2 on crisphead-type lettuce (Lactuca sativa L. cv. ‘Wintergreen’ were measured in an aeroponic system under photosynthetic photon flux of 650 μmol m-2 s-1, 12 h photoperiod at 36oC/30oC and 28oC/22oC (day/night), with three enriched RZ CO2 levels (2000 ppm, 10,000 ppm and 50,000 ppm). Leaf growth was monitored after elevated RZ CO2 had been supplied for one week. Leaf areas with elevated RZ CO2 were greater than ambient controls at both temperatures, while shoot and root weights were also higher. Increasing temperature reduced biomass overall, but the relative response to RZ CO2 was greater. Elevated RZ CO2 stimulated photosynthetic CO2 assimilation, with greater increase at higher temperatures. Elevated RZ CO2 decreased stomatal conductance at both temperatures, reducing transpiration water loss.
Description: This is the final draft, after peer-review, of a manuscript published in Acta Horticulturae. The published version is available online at
ISSN: 0567-7572
Other Identifiers: 10.17660/ActaHortic.2004.648.5
Appears in Collections:Journal Articles

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