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Plant and Cell Physiology Advance Access published online on December 3, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn189
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Cold tolerant crop species have greater temperature homeostasis of leaf respiration and photosynthesis than cold sensitive species

Wataru Yamori1, Ko Noguchi2, Kouki Hikosaka3 and Ichiro Terashima2

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, Aoba, Sendai, 980-8578, Japan

Corresponding author: Wataru Yamori Molecular Plant Physiology Group, Research School of Biological Sciences, The Australian National University, Canberra, ACT, 2601, AustraliaTel: Tel: +61 2 6125 5430, FAX: Fax: +61 2 6125 5075, E-mail: wataru.yamori{at}anu.edu.au


  Abstract

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 herbaceous 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°C and 30°C. Cold tolerant species showed a greater extent of temperature homeostasis of both Rarea and Parea than cold sensitive species. 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 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 respiratory enzyme (NAD-malic enzyme). The Rarea/Parea ratio was maintained irrespective of growth temperatures in all the species, suggesting that the extent of temperature homeostasis of Rarea interacted with photosynthetic rate and/or the homeostasis of photosynthesis

Keywords: cold tolerance - phenotypic plasticity - photosynthesis - respiration - temperature acclimation - temperature homeostasis

Present address: Wataru Yamor 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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