Plant and Cell Physiology Advance Access originally published online on December 3, 2008
Plant and Cell Physiology 2009 50(2):203-215; doi:10.1093/pcp/pcn189
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Cold-Tolerant Crop Species Have Greater Temperature Homeostasis of Leaf Respiration and Photosynthesis Than Cold-Sensitive Species
1Department of Biology, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043 Japan
2Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
3Graduate School of Life Sciences, Tohoku University, 6-3 Aoba, Sendai, 980-8578 Japan
* Corresponding author: E-mail, wataru.yamori{at}anu.edu.au; Fax, +61-2-6125-5075.
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Abstract |
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Some plant species show constant rates of respiration and photosynthesis measured at their respective growth temperatures (temperature homeostasis), whereas others do not. However, it is unclear what species show such temperature homeostasis and what factors affect the temperature homeostasis. To analyze the inherent ability of plants to acclimate respiration and photosynthesis to different growth temperatures, we examined 11 herbace-ous crops with different cold tolerance. Leaf respiration (Rarea) and photosynthetic rate (Parea) under high light at 360 µl l–1 CO2 concentrations were measured in plants grown at 15 and 30°C. Cold-tolerant species showed a greater extent of temperature homeostasis of both Rarea and Parea than cold-sensitive species. The underlying mechanisms which caused differences in the extent of temperature homeostasis were examined. The extent of temperature homeostasis of Parea was not determined by differences in leaf mass and nitrogen content per leaf area, but by differences in photosynthetic nitrogen use efficiency (PNUE). Moreover, differences in PNUE were due to differences in the maximum catalytic rate of Rubisco, Rubisco contents and amounts of nitrogen invested in Rubisco. These findings indicated that the temperature homeostasis of photosynthesis was regulated by various parameters. On the other hand, the extent of temperature homeostasis of Rarea was unrelated to the maximum activity of the respiratory enzyme (NAD-malic enzyme). The Rarea/Parea ratio was maintained irrespective of the growth temperatures in all the species, suggesting that the extent of temperature homeostasis of Rarea interacted with the photosynthetic rate and/or the homeostasis of photosynthesis.
Keywords: Cold tolerance - Phenotypic plasticity - Photosynthesis - Respiration - Temperature acclimation - Temperature homeostasis
Abbreviations: DTT, Dithiothreitol; HT, high temperature; LMA, leaf mass per area; LT, low temperature; NAD-ME, NAD-malic enzyme; Narea, nitrogen content per leaf area; Parea, net photosynthetic rate; Pmass, photosynthetic rate per leaf mass; PNUE, photosynthetic nitrogen use efficiency; Rarea, dark respiration rate; Rmass, respiration rate per leaf mass; RM-ANOVA, repeated measures analysis of variance; RuBP, ribulose bisphosphate; RNUE, respiratory nitrogen use efficiency
4Present address: Molecular Plant Physiology Group, Research School of Biological Sciences, Building 46, The Australian National University, Canberra, ACT, 2601 Australia.
(Received October 13, 2008; Accepted November 27, 2008)
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