期刊
PLANT AND CELL PHYSIOLOGY
卷 57, 期 5, 页码 897-903出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcw012
关键词
C-4 evolution; C-4 photosynthesis; Cyclic electron transport around photosystem I; Genus Flaveria
资金
- Japan Society for the Promotion of Science [GS019, 22770039]
- Grants-in-Aid for Scientific Research [22770039] Funding Source: KAKEN
C-4 photosynthesis is present in approximately 7,500 species classified into 19 families, including monocots and eudicots. In the majority of documented cases, a two-celled CO2-concentrating system that uses a metabolic cycle of four-carbon compounds is employed. C-4 photosynthesis repeatedly evolved from C-3 photosynthesis, possibly driven by the survival advantages it bestows in the hot, often dry, and nutrient-poor soils of the tropics and subtropics. The development of the C-4 metabolic cycle greatly increased the ATP demand in chloroplasts during the evolution of malic enzyme-type C-4 photosynthesis, and the additional ATP required for C-4 metabolism may be produced by the cyclic electron transport around PSI. Recent studies have revealed the nature of cyclic electron transport and the elevation of its components during C-4 evolution. In this review, we discuss the energy requirements of C-3 and C-4 photosynthesis, the current model of cyclic electron transport around PSI and how cyclic electron transport is promoted during C-4 evolution using studies on the genus Flaveria, which contains a number of closely related C-3, C-4 and C-3-C-4 intermediate species.
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