期刊
PLANTA
卷 246, 期 5, 页码 1045-1050出版社
SPRINGER
DOI: 10.1007/s00425-017-2761-1
关键词
Arabidopsis; Cyclic electron transfer; Non-photochemical quenching; PGR5; Photosynthesis; Delta pH
资金
- KAKENHI [17H05719, 16K14694, 16H03280]
- Grants-in-Aid for Scientific Research [16H03280, 17H05719, 16K14694] Funding Source: KAKEN
Respective contributions of PGR5- and NDH-dependent cyclic electron flows around photosystem I for generating the proton gradient across the thylakoid membrane are Delta 30 and Delta 5%. The proton concentration gradient across the thylakoid membrane (Delta pH) produced by photosynthetic electron transport is the driving force of ATP synthesis and non-photochemical quenching. Two types of electron transfer contribute to Delta pH formation: linear electron flow (LEF) and cyclic electron flow (CEF, divided into PGR5- and NDH-dependent pathways). However, the respective contributions of LEF and CEF to Delta pH formation are largely unknown. We employed fluorescence quenching analysis with the pH indicator 9-aminoacridine to directly monitor Delta pH formation in isolated chloroplasts of Arabidopsis mutants lacking PGR5- and/or NDH-dependent CEF. The results indicate that Delta pH formation is mostly due to LEF, with the contributions of PGR5- and NDH-dependent CEF estimated as only Delta 30 and Delta 5%, respectively.
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