Abstract
Changes in photosynthesis (A) and carbohydrate partitioning were studied for Encelia farinosa, a common C3 desert shrub in the southwestern United States, after a 3-month exposure to the current or a doubled CO2 concentration (750 [mu]L L-1). A remained unchanged under the current CO2 concentration but decreased during the day under the doubled CO2 concentration, resulting in a 46% enhancement in the early morning, 26% at midday, and 15% in the late afternoon by the elevated CO2. The decrease during the day under the doubled CO2 concentration may represent end-product inhibition, because the sucrose and the starch contents increased during the day proportionally more than under the current CO2 concentration. The 14CO2 activity in sink leaves was maximal 3 h after labeling under the doubled and at 5 h under the current CO2 concentration, indicating faster movement of photosynthate out of source leaves and into sink tissues under the doubled CO2 concentration, which may have been responsible for the sustained enhancement in A under the doubled CO2 concentration.
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- Campbell W. J., Allen L. H., Bowes G. Effects of CO(2) Concentration on Rubisco Activity, Amount, and Photosynthesis in Soybean Leaves. Plant Physiol. 1988 Dec;88(4):1310–1316. doi: 10.1104/pp.88.4.1310. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Clough J. M., Peet M. M., Kramer P. J. Effects of High Atmospheric CO(2) and Sink Size on Rates of Photosynthesis of a Soybean Cultivar. Plant Physiol. 1981 May;67(5):1007–1010. doi: 10.1104/pp.67.5.1007. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ehleringer J. R., Björkman O. A comparison of photosynthetic characteristics of encelia species possessing glabrous and pubescent leaves. Plant Physiol. 1978 Aug;62(2):185–190. doi: 10.1104/pp.62.2.185. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Goldschmidt E. E., Huber S. C. Regulation of photosynthesis by end-product accumulation in leaves of plants storing starch, sucrose, and hexose sugars. Plant Physiol. 1992 Aug;99(4):1443–1448. doi: 10.1104/pp.99.4.1443. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Redgwell R. J. Fractionation of plant extracts using ion-exchange Sephadex. Anal Biochem. 1980 Sep 1;107(1):44–50. doi: 10.1016/0003-2697(80)90489-3. [DOI] [PubMed] [Google Scholar]
- Rey P., Eymery F., Peltier G. Effects of CO(2)-Enrichment and of Aminoacetonitrile on Growth and Photosynthesis of Photoautotrophic Calli of Nicotiana plumbaginifolia. Plant Physiol. 1990 Jun;93(2):549–554. doi: 10.1104/pp.93.2.549. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sharkey T. D., Berry J. A., Raschke K. Starch and Sucrose Synthesis in Phaseolus vulgaris as Affected by Light, CO(2), and Abscisic Acid. Plant Physiol. 1985 Mar;77(3):617–620. doi: 10.1104/pp.77.3.617. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sharkey T. D., Vanderveer P. J. Stromal Phosphate Concentration Is Low during Feedback Limited Photosynthesis. Plant Physiol. 1989 Oct;91(2):679–684. doi: 10.1104/pp.91.2.679. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wang N., Nobel P. S. Doubling the CO2 Concentration Enhanced the Activity of Carbohydrate-Metabolism Enzymes, Source Carbohydrate Production, Photoassimilate Transport, and Sink Strength for Opuntia ficus-indica. Plant Physiol. 1996 Mar;110(3):893–902. doi: 10.1104/pp.110.3.893. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Yelle S., Beeson R. C., Trudel M. J., Gosselin A. Acclimation of Two Tomato Species to High Atmospheric CO(2): II. Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase and Phosphoenolpyruvate Carboxylase. Plant Physiol. 1989 Aug;90(4):1473–1477. doi: 10.1104/pp.90.4.1473. [DOI] [PMC free article] [PubMed] [Google Scholar]