Differences between maize and rice in N-use efficiency for photosynthesis and protein allocation.
The N-use efficiency for photosynthesis was higher in a C(4) plant, maize, than in a C(3) plant, rice, including rbcS antisense rice with optimal ribulose-1,5-bisphosphate carboxylase (Rubisco) content for CO(2)-saturated photosynthesis, even when photosynthesis was measured under saturating CO(2) conditions. The N cost for the C(4) 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 CO(2) concentrating mechanism may support higher N-use efficiency for photosynthesis in maize.
Makino
Amane
A
Department of Applied Plant Science, Graduate School of Agricultural Sciences, Tohoku University, Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan. makino@biochem.tohoku.ac.jp
Sakuma
Hiroe
H
Sudo
Emi
E
Mae
Tadahiko
T
D012275:Oryza / Q000378:metabolism / Q000502:physiology*; D010788:Photosynthesis; D010940:Plant Proteins / Q000378:metabolism*; D020524:Thylakoids / Q000378:metabolism; D003313:Zea mays / Q000378:metabolism / Q000502:physiology*
D010940:Plant Proteins