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DOI: | 10.1104/pp.66.4.541 |
Web URL(s): | http://www.plantphysiol.org/content/66/4/541.full.pdf+html Last checked: 08/08/2012 Requires: PDF Reader Access conditions: Content is within a limited access website |
Publication Type:
| Refereed |
Author(s): | Brown, R. Harold;
Morgan, Jack A. |
Author Affiliation: | Department of Agronomy, University of Georgia, Athens, Georgia |
Title: | Differential effects of temperature and light intensity on photorespiration in C3, C4, and intermediate species |
Article Series: | Photosynthesis in grass species differing in carbon dioxide fixation pathways, part 6 |
Source: | Plant Physiology. Vol. 66, No. 4, October 1980, p. 541-544. |
Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
# of Pages: | 4 |
Related Web URL: | http://www.plantphysiol.org/content/66/4/541.abstract Last checked: 08/08/2012 Notes: Abstract only |
Keywords: | TIC Keywords: Panicum milioides; Panicum latifolium; Festuca arundinacea; Photorespiration; Temperatures; Light
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Geographic Terms: | Georgia |
Abstract/Contents: | "The effects of temperature and photosynthetically active radiation levels on photorespiration were investigated in Panicum milioides Nees ex Trin. and Panicum schenckii Hack., species known to have low photorespiration rates and other characteristics intermediate between C3 and C4 species. Comparisons were made with the C3 grass species tall fescue (Festuca arundinacea Schreb.). An increase in temperature from 20 to 35 C raised photorespiration from 7.3 to 10.2 milligrams per square decimeter per hour in tall fescue, but the increase in P. schenckii was less than 1 milligram per square decimeter per hour. Increases in temperature caused much less change in CO2 compensation concentration in P. milioides and P. schenckii than in tall fescue, values of 160 microliters per liter being obtained in tall fescue at 40 C compared to about 40 microliters per liter for P. milioides and P. schenckii. Photorespiration in P. schenckii increased by only about 1 milligram CO2 per square decimeter per hour as the photosynthetically active radiation level was raised from 100 to 2,000 microEinsteins per square meter per second. Loss of CO2 into CO2-free air actually decreased from 2.2 to 1.0 milligrams per square decimeter per hour as the radiation level was raised from 100 to 1,100 microEinsteins per square meter per second but tended to rise again at 2,000 microEinsteins per square meter per second. In contrast, photorespiration in tall fescue tripled with radiation level over the same range, reaching a maximum value of 7.2 milligrams per square decimeter per hour as determined by extrapolation of the CO2 response curves to zero CO2. The CO2 compensation concentration in tall fescue was nearly insensitive to photosynthetically active radiation above 140 microEinsteins per square meter per second but, in P. milioides and P. schenckii, it decreased from values of 69 and 62 microliters per liter, respectively, to values of 21 and 16 as the radiation level was increased from 50 to 1075 microEinsteins per square meter per second. Interpolation of CO2-response curves showed that an increase in photosynthetically active radiation level from 100 to 2,000 microEinsteins per square meter per second reduced the CO2 compensation value of P. schenckii from 38 to 19 microliters per liter. Data from these experiments indicate reduced photorespiration or a CO2-recycling mechanism in P. milioides and P. schenckii which causes apparent photorespiration to be nearly insensitive to temperature in the 20 to 35 C range and to decrease at high radiation intensities." |
Language: | English |
References: | 21 |
See Also: | See also part 1 "Water-use efficiency" Crop Science, 19(3) May/June 1979, p. 375-379, R=4035. R=4035
See also part 3 "Oxygen response and enzyme activities of species in the Laxa group of Panicum" Plant Physiology, 65(1) January 1980, p. 156-159, R=3989. R=3989
See also part 5 "Response of Panicum maximum, Panicum milioides, and tall fescue (Festuca arundinacea) to nitrogen nutrition" Plant Physiology, 66(1) July 1980, p. 97-100, R=3963. R=3963 |
Note: | Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Brown, R. H., and J. A. Morgan. 1980. Differential effects of temperature and light intensity on photorespiration in C3, C4, and intermediate species. Plant Physiol. 66(4):p. 541-544. |
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| DOI: 10.1104/pp.66.4.541 |
| Web URL(s): http://www.plantphysiol.org/content/66/4/541.full.pdf+html Last checked: 08/08/2012 Requires: PDF Reader Access conditions: Content is within a limited access website |
| MSU catalog number: QK 1 .P68 |
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