Photosynthetica 2011, 49(1):145-148 | DOI: 10.1007/s11099-011-0006-2

Reduced nitrogen allocation to expanding leaf blades suppresses ribulose-1,5-bisphosphate carboxylase/oxygenase synthesis and leads to photosynthetic acclimation to elevated CO2 in rice

S. Seneweera1,*
1 Department of Agriculture and Food Systems, Melbourne School of Land and Environment, The University of Melbourne, Horsham, Australia

Net photosynthetic rate (P N) measured at elevated CO2 concentration (C e), ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), and nitrogen (N) content in rice leaves decreased significantly after exposure to long term C e. The reduction in P N, Rubisco, and leaf N at C e was similar for the last fully expanded leaf blade (LFELB) and expanding leaf blade (ELB). Spatial leaf N content in the ELB was highest in the zone of cell division, sharply declined as cell expansion progressed and gradually increased with cell maturation. Maximum reduction in spatial leaf N and Rubisco content was found at C e only within cell expansion and maturation zones. The spatial leaf N content correlated well with the amount of Rubisco synthesized during leaf expansion, suggesting that N deposition into the expanding leaf blade may be the key for Rubisco synthesis and possibly photosynthetic acclimation to C e.

Additional key words: elevated CO2; photosynthesis; ribulose-1,5-bisphosphate carboxylase, oxygenase; rice; spatial nitrogen deposition

Received: April 14, 2010; Accepted: January 1, 2011; Published: March 1, 2011  Show citation

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Seneweera, S. (2011). Reduced nitrogen allocation to expanding leaf blades suppresses ribulose-1,5-bisphosphate carboxylase/oxygenase synthesis and leads to photosynthetic acclimation to elevated CO2 in rice. Photosynthetica, 49(1), 145-148. doi: 10.1007/s11099-011-0006-2
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