期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 127, 期 -, 页码 1-7出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2013.07.012
关键词
Photosystem I; Mercury; Membrane potential; Proton gradient; Aquatic plant
资金
- Program of 100 Distinguished Young Scientists of the Chinese Academy of Sciences
- National Natural Science Foundations of China [U1120302, 21177127, 4090300D0301]
Mercury (Hg) is one of the top toxic metals in environment and it poses a great risk to organisms. This study aimed to elucidate the toxic effects of Hg2+ on energy conversion of photosystem I (PSI) and photosystem II (PSII), membrane potential and proton gradient of Microsorium pteropus (an aquatic plant species). Contents of chlorophyll a, chlorophyll b and carotenoids, quantum yield and electron transfer of PSI and PSII of M. pteropus exposed to various concentrations of Hg2+ were measured. With increasing Hg2+ concentration, quantum yield and electron transport of PSI [Y(I) and ETR(I)] and PSII [Y(II) and ETR(II)] decreased whereas limitation of donor side of PSI [Y(ND)] increased. At >= 165 mu g L-1 Hg2+, quantum yield of non-light-induced non-photochemical fluorescence quenching in PSII [Y(NO)] significantly increased but quantum yield of light-induced non-photochemical fluorescence quenching [Y(NPQ)] decreased. Membrane potential (Delta psi) and proton gradient (Delta pH) of M. pteropus were reduced significantly at 330 mu g L-1 Hg2+ compared to control. Mercury exposure affected multiple sites in PSII and PSI of M. pteropus. (C) 2013 Elsevier B.V. All rights reserved.
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