Journal Article

Photosynthetic Acclimation in Rice Leaves to Free-air CO<sub>2</sub> Enrichment Related to Both Ribulose-1,5-bisphosphate Carboxylation Limitation and Ribulose-1,5-bisphosphate Regeneration Limitation

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 7, pages 1036-1045
Published in print July 2005 | ISSN: 0032-0781
Published online July 2005 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci113
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

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  • Biochemistry
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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.

Keywords: CO2 enrichment; Photosynthetic acclimation; Rice; RuBP carboxylation limitation; RuBP regeneration limitation; Ca, atmospheric CO2 concentration; CE, carboxylation efficiency; Ci, intercellular CO2 concentration; FACE, free-air CO2 enrichment; Fru, fructose; Glc, glucose; Gs, stomatal conductance; LHC II, light-harvesting complex II; Pi, inorganic phosphate; Pn, net photosynthetic rate; PPFD, photosynthetic photon flux density; Rubisco, ribulose-1,5-bisphosphate caboxylase/oxygenase; RuBP, ribulose-1,5-bisphosphate; Φc, apparent quantum yield of carbon assimilation; SPS, sucrose-phosphate synthase; Suc, sucrose; WUE, water use efficiency

Journal Article.  6471 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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