Promotion of cyclic electron transport around photosystem I with the development of Csub(4) photosynthesis
2016
Munekage, Y.N. (Kwansei Gakuin University, Sanda, Hyogo (Japan). School of Science and Technology) | Taniguchi, Y.Y.
Csub(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. Csub(4) photosynthesis repeatedly evolved from Csub(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 Csub(4) metabolic cycle greatly increased the ATP demand in chloroplasts during the evolution of malic enzyme-type Csub(4) photosynthesis, and the additional ATP required for Csub(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 Csub(4) evolution. In this review, we discuss the energy requirements of Csub(3) and Csub(4) photosynthesis, the current model of cyclic electron transport around PSI and how cyclic electron transport is promoted during Csub(4) evolution using studies on the genus Flaveria, which contains a number of closely related Csub(3), Csub(4) and Csub(3)-Csub(4) intermediate species.
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