Action of Some Organomercury Compounds on Photosynthesis in Spinach Chloroplasts

Šeršeň, František; Kráľová, Katarína

doi:10.2478/eces-2013-0036

Abstract

The effects of five organomercury compounds (methylmercuric chloride, phenylmercuric acetate, phenylmercuric borate, phenylmercuric citrate and diphenylmercury) on photosynthetic electron transport (PET) in spinach chloroplasts were investigated. The IC₅₀ values of organomercury compounds related to PET inhibition in spinach chloroplasts varied in the range from 468 mmol dm^-3 to 942 mmol dm^-3 and were approximately by one order higher than the corresponding value determined for HgCl₂ applied also in DMSO solution (IC₅₀ = 58 mmol dm^-3). Due to extremely low aqueous solubility of diphenylmercury, the corresponding IC₅₀ value could not be determined. Using EPR spectroscopy as probable sites of action of organomercury compounds in photosynthetic apparatus ferredoxin on the acceptor side of PS 1 and the quinone electron acceptors Q_A or Q_B on the reducing side of PS 2 were suggested.

References

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Action of Some Organomercury Compounds on Photosynthesis in Spinach Chloroplasts

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