Journal Article

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

Amane Makino, Hiroe Sakuma, Emi Sudo and Tadahiko Mae

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 9, pages 952-956
Published in print September 2003 | ISSN: 0032-0781
Published online September 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg113
Differences between Maize and Rice in N-use Efficiency for Photosynthesis and Protein Allocation

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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.

Keywords: Keywords: Gas exchange (leaf) — N-use efficiency — Oryza sativa L. — Protein allocation — Ribulose-1,5-bisphosphate carboxylase/oxygenase — Zea mays L.; Abbreviations: CF, coupling factor; LHC, light-harvesting Chl protein complex; ME, malic enzyme; PEPC, phosphoenolpyruvate carboxylase; PPDK, pyruvate orthophosphate dikinase; PPFD, photosynthetic photon flux density; PS, photosystem; RuBP, ribulose-1,5-bisphosphate; Rubisco, RuBP carboxylase/oxygenase.

Journal Article.  4003 words.  Illustrated.

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

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