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Plant and Cell Physiology, 2003, Vol. 44, No. 9 952-956
© 2003 Oxford University Press

Short Communications

Differences between Maize and Rice in N-use Efficiency for Photosynthesis and Protein Allocation

Amane Makino1, Hiroe Sakuma, Emi Sudo and Tadahiko Mae

Department of Applied Plant Science, Graduate School of Agricultural Sciences, Tohoku University, Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan

Abstract

The N-use efficiency for photosynthesis was higher in a C4 plant, maize, than in a C3 plant, rice, including rbcS antisense rice with optimal ribulose-1,5-bisphosphate carboxylase (Rubisco) content for CO2-saturated photosynthesis, even when photosynthesis was measured under saturating CO2 conditions. The N cost for the C4 cycle enzymes in maize was not large, and the lower amount of Rubisco allowed a greater N investment in the thylakoid components. This greater content of the thylakoid components as well as the CO2 concentrating mechanism may support higher N-use efficiency for photosynthesis in maize.

Footnotes

1 Corresponding author: E-mail, makino{at}biochem.tohoku.ac.jp; Fax, +81-22-717-8765.


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