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Plant and Cell Physiology Advance Access originally published online on April 19, 2005
Plant and Cell Physiology 2005 46(7):1036-1045; doi:10.1093/pcp/pci113
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JSPP © 2005

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 Chen1, Zhen-Hua Yong1, Yi Liao1, Dao-Yun Zhang1, Yue Chen1, Hai-Bo Zhang1, Juan Chen1, Jian-Guo Zhu2 and Da-Quan Xu1,*

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

* Corresponding author: E-mail, dqxu{at}sippe.ac.cn; Fax, +86-21-54924015.

Net photosynthetic rates (Pns) 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 the same CO2 concentration, the 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 the 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 decreased in FACE leaves, as shown by the Pn–Ci curves. In addition, the soluble protein, Rubisco (ribulose-1,5-bisphosphate caboxylase/oxygenase), and its activase contents 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.

(Received September 8, 2004; Accepted April 15, 2005)
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