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Plant and Cell Physiology Advance Access published online on February 27, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp029
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved.
The online version of this article has been published under an open access model. Users are entitled to use, reproduce, disseminate, or display the open access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and the Japanese Society of Plant Physiologists are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact journals.permissions@oxfordjournals.org

Differences between rice and wheat in temperature responses of photosynthesis and plant growth

Takeshi Nagai and Amane Makino*

Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai 981-8555, Japan

*Corresponding author: Prof. Amane Makino. Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai 981-8555, Japan, E-mail: makino{at}biochem.tohoku.ac.jp, Fax: +81-22-717-8765


  Abstract

The temperature responses of photosynthesis (A) and growth were examined in rice and wheat grown hydroponically under day/night-temperature regimes of 13/10°C, 19/16°C, 25/19°C, 30/24°C and 37/31°C. Irrespective of growth temperature, the maximal rates of A were found to be at 30 to 35°C in rice and at 25 to 30°C in wheat, respectively. Below 25°C the rates were higher in wheat, while above 30°C they were higher in rice. However, in both species, A measured at the growth temperature remained almost constant irrespective of temperature. Biomass production and relative growth rate (RGR) were greatest in rice grown at 30/24°C and in wheat grown at 25/19°C. Although there was no difference between the species in the optimal temperature of the leaf area ratios (LAR), the net assimilation rate (NAR) in rice decreased at low temperature (19/16°C) while the NAR in wheat decreased at high temperature (37/31°C). For both species, the N-use efficiency (NUE) for growth rate (GR) was estimated by dividing NAR by leaf-N content, correlated with GR and with biomass production. Similarly, when NUE for A at growth temperature was estimated, the temperature response of NUE for A was similar to that of NUE for GR in both species. The results suggest that the difference between rice and wheat in the temperature response of biomass production depends on the difference in temperature dependence of NUE for A.

Keywords: biomass production - N-use efficiency - Oryza sativa L - photosynthesis - temperature - Triticum aestivum L

(Received January 6, 2009; Accepted February 17, 2009)
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