Abstract
The inhibition of photosynthesis at low leaf water potentials was studied in soil-grown sunflower to determine the degree to which photosynthesis under high light was affected by stomatal and nonstomatal factors. Below leaf water potentials of −11 to −12 bars, rates of photosynthesis at high light intensities were insensitive to external concentrations of CO2 between 200 and 400 microliters per liter. Photosynthesis also was largely insensitive to leaf temperature between 10 and 30 C. Changes in CO2 concentration and temperature had negligible effect on leaf diffusive resistance. The lack of CO2 and temperature response for both photosynthesis and leaf diffuse resistance indicates that rates of photosynthesis were not limited by either CO2 diffusion or a photosynthetic enzyme. It was concluded that photosynthesis under high light was probably limited by reduced photochemical activity of the leaves at water potentials below −11 to −12 bars.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Boyer J. S., Bowen B. L. Inhibition of oxygen evolution in chloroplasts isolated from leaves with low water potentials. Plant Physiol. 1970 May;45(5):612–615. doi: 10.1104/pp.45.5.612. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Boyer J. S. Differing sensitivity of photosynthesis to low leaf water potentials in corn and soybean. Plant Physiol. 1970 Aug;46(2):236–239. doi: 10.1104/pp.46.2.236. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Boyer J. S. Isopiestic technique: measurement of accurate leaf water potentials. Science. 1966 Dec 16;154(3755):1459–1460. doi: 10.1126/science.154.3755.1459. [DOI] [PubMed] [Google Scholar]
- Boyer J. S. Leaf water potentials measured with a pressure chamber. Plant Physiol. 1967 Jan;42(1):133–137. doi: 10.1104/pp.42.1.133. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Forrester M. L., Krotkov G., Nelson C. D. Effect of oxygen on photosynthesis, photorespiration and respiration in detached leaves. I. Soybean. Plant Physiol. 1966 Mar;41(3):422–427. doi: 10.1104/pp.41.3.422. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Schneider G. W., Childers N. F. INFLUENCE OF SOIL MOISTURE ON PHOTOSYNTHESIS, RESPIRATION, AND TRANSPIRATION OF APPLE LEAVES. Plant Physiol. 1941 Jul;16(3):565–583. doi: 10.1104/pp.16.3.565. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shimshi D. Effect of Soil Moisture and Phenylmercuric Acetate upon Stomatal Aperture, Transpiration, and Photosynthesis. Plant Physiol. 1963 Nov;38(6):713–721. doi: 10.1104/pp.38.6.713. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Twente J. W., Twente J. A. Regulation of hibernating periods by temperature. Proc Natl Acad Sci U S A. 1965 Oct;54(4):1044–1051. [PMC free article] [PubMed] [Google Scholar]