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![](https://webarchive.library.unt.edu/eot2008/20081111111943im_/http://www.ars.usda.gov/incme/images/Research_head.gif) |
Research Project:
IDENTIFYING AND MANIPULATING DETERMINANTS OF PHOTOSYNTHATE PRODUCTION AND PARTITIONING
Location: Photosynthesis Research Unit
Title: Long-term growth of soybean at elevated [CO2] does not cause acclimation of stomatal conductance under fully open-air conditions
Authors
![item](https://webarchive.library.unt.edu/eot2008/20081111111943im_/http://www.ars.usda.gov/incme/images/bullet.gif) | Leakey, Andrew D - UNIVERSITY OF ILLINOS | ![item](https://webarchive.library.unt.edu/eot2008/20081111111943im_/http://www.ars.usda.gov/incme/images/bullet.gif) | Bernacchi, Carl - ILLINOIS STATE WATER SURB | ![item](https://webarchive.library.unt.edu/eot2008/20081111111943im_/http://www.ars.usda.gov/incme/images/bullet.gif) |
Ort, Donald
| ![item](https://webarchive.library.unt.edu/eot2008/20081111111943im_/http://www.ars.usda.gov/incme/images/bullet.gif) | Long, Stephen - UNIVERSITY OF ILLINOIS |
Submitted to: American Society of Plant Biologists Annual Meeting
Publication Type:
Abstract
Publication Acceptance Date: October 10, 2006
Publication Date: October 10, 2006
Publisher's URL: http:////www.aspb.org/meetings/transpiration06/justabstracts.cfm
Citation: Leakey, A.B., Bernacchi, C., Ort, D.R., Long, S.L. 2006. Long-term growth of soybean at elevated [CO2] does not cause acclimation of stomatal conductance under fully open-air conditions. American Society of Plant Biologists Annual Meeting. Available at http://www.aspb.org/meetings/transpiration06/justabstracts.cfm.
Technical Abstract: Accurately predicting plant function and global biogeochemical cycles later this century will be complicated if stomatal conductance (gs) acclimates to growth at elevated [CO2], in the sense of a long-term alteration of the response of gs to [CO2], humidity (h) and/or photosynthetic rate (A). If so, photosynthetic and stomatal models will require parameterization at each growth [CO2] of interest. Photosynthetic acclimation to long-term growth at elevated [CO2] occurs frequently. Acclimation of gs has rarely been examined, even though stomatal density commonly changes with growth [CO2]. Soybean was grown under field conditions at ambient [CO2] (378 micromol mol-1) and elevated [CO2] (552 micromol mol-1) using Free-Air [CO2] Enrichment (FACE). This study tested for stomatal acclimation by parameterizing and validating the widely used Ball et al. model (1987, Progress in Photosynthesis Research, Vol IV, 221-224) with measurements of leaf gas exchange. The dependence of gs on A, h and [CO2] at the leaf surface was unaltered by long-term growth at elevated [CO2]. This suggests that the commonly observed decrease in gs under elevated [CO2] is due entirely to the direct instantaneous effect of [CO2] on gs and that there is no longer-term acclimation of stomatal conductance independent of photosynthetic acclimation. The Ball et al. (1987) model accurately predicted gs for soybean growing under ambient and elevated [CO2] in the field. Model parameters under ambient and elevated [CO2] were indistinguishable, demonstrating that stomatal function under ambient and elevated [CO2] could be modeled without the need for parameterization at each growth [CO2].
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Last Modified: 11/10/2008
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