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Plant and Cell Physiology Advance Access published online on April 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci113
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received September 8, 2004
Accepted April 15, 2005

Regular Paper

Photosynthetic Acclimation in Rice Leaves to Free-Air Co2 Enrichment Related to Both Ribulose-1,5-Bisphosphate Carboxylation Limitation and Ribulose-1,5-Bisphosphate Regeneration Limitation

Gen-Yun Chen 1, Zhen-Hua Yong 1, Yi Liao 1, Dao-Yun Zhang 1, Yue Chen 1, Hai-Bo Zhang 1, Juan Chen 1, Jian-Guo Zhu 2, and Da-Quan Xu 1*

1 Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, China
2 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, China

* To whom correspondence should be addressed.
Da-Quan Xu, E-mail: dqxu{at}iris.sipp.ac.cn


  Abstract

Net photosynthetic rates (Pn) in leaves were compared between rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 µmol mol-1 above ambient) treatment rings. When measured at a same CO2 concentration, Pn of FACE leaves decreased significantly, indicating that photosynthetic acclimation to high CO2 occurs. Although stomatal conductance (Gs) in FACE leaves was markedly decreased, intercellular CO2 concentrations (Ci) were almost same in FACE and ambient leaves, indicating that the photosynthetic acclimation is not caused by the decreased Gs. Furthermore, carboxylation efficiency and maximal Pn, both light and CO2-saturated Pn, were declined in FACE leaves, as shown by the Pn-Ci curves. In the meantime, the soluble protein, Rubisco, and its activase as well as the sucrose-phosphate synthase activity decreased significantly, while some soluble sugar, inorganic phosphate, chlorophyll and light-harvesting complex II (LHC II) contents increased in FACE leaves. It appears that the photosynthetic acclimation in rice leaves is related to both ribulose-1,5-bisphosphate (RuBP) carboxylation limitation and RuBP regeneration limitation.

Keywords: ATP shortage; CO2 enrichment; Photosynthetic acclimation; Rice; RuBP carboxylation limitation; RuBP regeneration limitation.
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