Central role of cyclic electron transport around photosystem I in the regulation of photosynthesis

- PSI cyclic electron transport consists of two pathways in angiosperms.
- The main pathway depends on PGR5/PGRL1 proteins, which are the target site of antimycin A.
- Chloroplast NDH also mediates ferredoxin-dependent plastoquinone reduction.
- Proton conductivity of ATPase is disturbed in the pgr5 mutant.
- PSI cyclic electron transport is essential for the regulation of photosynthesis via controlling lumen pH.