期刊
NEW PHYTOLOGIST
卷 200, 期 1, 页码 74-85出版社
WILEY
DOI: 10.1111/nph.12373
关键词
Emiliania huxleyi; gross photosynthesis; light acclimation; light harvesting; nonphotochemical quenching; photoinactivation; photoinhibition
资金
- NERC [NE/G003688/1]
- NERC [NE/F002971/1, NE/G003688/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F002971/1, NE/G003688/1] Funding Source: researchfish
Mechanistic understanding of the costs and benefits of photoacclimation requires knowledge of how photophysiology is affected by changes in the molecular structure of the chloroplast. We tested the hypothesis that changes in the light dependencies of photosynthesis, non-photochemical quenching and PSII photoinactivation arises from changes in the abundances of chloroplast proteins in Emiliania huxleyi strain CCMP 1516 grown at 30 (Low Light; LL) and 1000 (High Light; HL) mu mol photons m(-2) s(-1) photon flux densities. Carbon-specific light-saturated gross photosynthesis rates were not significantly different between cells acclimated to LL and HL. Acclimation to LL benefited cells by increasing biomass-specific light absorption and gross photosynthesis rates under low light, whereas acclimation to HL benefited cells by reducing the rate of photoinactivation of PSII under high light. Differences in the relative abundances of proteins assigned to light-harvesting (Lhcf), photo-protection (LI818-like), and the photosystem II (PSII) core complex accompanied differences in photophysiology: specifically, Lhcf: PSII was greater under LL, whereas LI818: PSII was greater in HL. Thus, photoacclimation in E. huxleyi involved a trade-off amongst the characteristics of light absorption and photoprotection, which could be attributed to changes in the abundance and composition of proteins in the light-harvesting antenna of PSII.
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