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Plant and Cell Physiology Advance Access published online on June 4, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci137
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 26, 2005
Accepted May 21, 2005

Regular Paper

Nitrogen Partitioning in the Photosynthetic Apparatus of Plantago asiatica Leaves Grown at Different Temperature and Light Conditions: Similarities and Differences between Temperature and Light Acclimation

Kouki Hikosaka 1*

1 Graduate School of Life Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan

* To whom correspondence should be addressed.
Kouki Hikosaka, E-mail: hikosaka{at}mail.tains.tohoku.ac.jp


  Abstract

Effects of growth temperature and irradiance on nitrogen partitioning among the photosynthetic components were studied. Plantago asiatica was grown under different temperature and light conditions. Growth conditions were regulated such that the chl a/b ratio in leaves grown at a low temperature with a low irradiance was similar to that in leaves grown at a high temperature with a high irradiance, suggesting that the balance between acquisition and utilisation of light energy in the photosynthetic apparatus was similar between the two growth conditions. When plotted against the leaf nitrogen content, the RuBP (ribulose-1,5-bisphosphate) carboxylase content did not significantly differ depending on growth conditions. Both high irradiance and low temperature decreased nitrogen partitioning to chlorophyll-protein complexes. Low temperature increased nitrogen allocation to stroma FBPase (fructose-1,6-phosphatase) irrespective of growth irradiance. Gas exchange measurement indicated that the ratio of the electron transport (Jmax) to the maximum carboxylation rate (Vcmax) was not affected by growth irradiance but by growth temperature. It is concluded that nitrogen partitioning between acquisition and utilisation of light energy responds both to growth temperature and irradiance, while nitrogen partitioning between carboxylation and regeneration of RuBP responds only to growth temperature.

Keywords: Balancing; Nitrogen use; Photosynthetic acclimation; Ribulose-1,5-bisphosphate carboxylation; Ribulose-1,5-bisphosphate regeneration.
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