Full TGIF Record # 74719
Item 1 of 1
Publication Type:
i
Report
Author(s):Sasaki, Hiroyuki; Fukuyama, Masataka; Onoue, Toko
Author Affiliation:Sasaki: Land Evaluation and Development Laboratory, Department of Grassland Management; and Fukuyama and Onoue: Production and Amenity Laboratory, Department of Grassland Management
Title:Effects of increasing CO2 concentration and leaf temperature on the photosynthesis of perennial ryegrass
Source:Bulletin of the National Grassland Research Institute. Vol. 60, March 2001, p. 1-7.
Publishing Information:Nishinasuno, Tochigi, Japan
# of Pages:7
Abstract/Contents:Carbon dioxide (CO2) is well known to be a `greenhouse gas' capable of causing significant climatic changes. The optimum geographic ranges of grass species are likely to shift as a result of climatic changes, and there will be corresponding changes in the vegetation zones here in Japan. The optimum range for each species must therefore be determined in order to select grass species that will grow in the new vegetation zones expected to result from climatic change. We measured the effect of doubled CO2 concentration and various leaf temperature increases on the net photosynthesis of perennial ryegrass. Perennial ryegrass (Lolium perenne L.) was grown in 1/5,000 a pots in two phytotrons with inflow CO2 concentrations of 350 ppm and 700 ppm. Net photosynthesis was measured under different environmental conditions: five different leaf temperatures (15, 20, 25, 30 and 35°C) and ten different incident photosynthetic photon flux densities (PPFD ; 0, 40, 100, 200, 300, 500, 700, 1,000, 1,500, and 2,000 μ mol photons m-2s-1) at a CO2 concentration of 350 ppm. Net photosynthesis was observed to increase rapidly at first, then gradually, with increases in PPFD. Net photosynthesis also tended to increase with elevation of leaf temperature, up to 20°C, but decreased above 25°C. Net photosynthesis was measured at five different leaf temperatures and eight different CO2 concentrations (0, 30, 100, 200, 350, 500, 700 and 1,000 ppm). The results showed that net photosynthesis increases with CO2 concentrations, up to 700 ppm at each temperature, and decreases with CO2 concentrations above 700 ppm at leaf temperatures of 15° and 20°C. In order to examine the effect of doubling CO2 concentration, the net photosynthesis was regressed by the quadratic of leaf temperature. Then the effect of the increase in CO2 concentration on the relative phtosynthetic ratios was calculated for each temperature, and the relationship between the relative photosynthetic ratio and leaf temperature was examined. The results showed that the relative ratio increases with increasing leaf temperature. The quadratic regression shows that net photosynthesis of perennial ryegrass is increased by two factors: increases in CO2 concentration and rising temperature. According to this equation, when the CO2 concentration rises, an increase in leaf temperature further accelerates the net photosynthesis of perennial ryegrass ; the relative ratio is calculated as a quantitiative value.
Language:English
References:19
Note:Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sasaki, H., M. Fukuyama, and T. Onoue. 2001. Effects of increasing CO2 concentration and leaf temperature on the photosynthesis of perennial ryegrass. Bull. Natl. Grassl. Res. Inst. 60:p. 1-7.
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