期刊
ELIFE
卷 5, 期 -, 页码 -出版社
eLIFE SCIENCES PUBL LTD
DOI: 10.7554/eLife.16921
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资金
- Basic Energy Sciences [DE-FG02-91ER20021]
- Biotechnology and Biological Sciences Research Council [BB/K002627/1]
- Royal Society
- Michigan State University Center for Advanced Algal and Plant Phenotyping
- Michigan State University AgBioResearch
- BBSRC [BB/K002627/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/K002627/1] Funding Source: researchfish
The thylakoid proton motive force (pmf) generated during photosynthesis is the essential driving force for ATP production; it is also a central regulator of light capture and electron transfer. We investigated the effects of elevated pmf on photosynthesis in a library of Arabidopsis thaliana mutants with altered rates of thylakoid lumen proton efflux, leading to a range of steady-state pmf extents. We observed the expected pmf-dependent alterations in photosynthetic regulation, but also strong effects on the rate of photosystem II (PSII) photodamage. Detailed analyses indicate this effect is related to an elevated electric field (Delta psi) component of the pmf, rather than lumen acidification, which in vivo increased PSII charge recombination rates, producing singlet oxygen and subsequent photodamage. The effects are seen even in wild type plants, especially under fluctuating illumination, suggesting that Delta psi-induced photodamage represents a previously unrecognized limiting factor for plant productivity under dynamic environmental conditions seen in the field.
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