Action of Some Organomercury Compounds on Photosynthesis in Spinach Chloroplasts

• Autorzy: Šeršeň F. , Kráľová K.

Warianty tytułu

PL

Wpływ niektórych związków rtęci na fotosyntezę w chloroplastach szpinaku

• Języki publikacji: EN

Abstrakty

EN

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.

PL

Zbadano wpływ pięciu związków rtęcioorganicznych (chlorku metylortęci, octanu fenylortęci, boranu fenylortęci, cytrynianu fenylortęci i difenylortęci) na fotosyntetyczny transport elektronów (PET) w chloroplastach szpinaku. Wartości IC₅₀ dla związków rtęcioorganicznych związanych z inhibicją PET w chloroplastach szpinaku zmieniała się w zakresie od 468 do 942 μmol dm^-3 i była w przybliżeniu o rząd większa od odpowiedniej wartości określonej dla HgCl₂, stosowanego również w roztworze DMSO (IC₅₀ = 58 μmol dm^-3). Ze względu na bardzo małą rozpuszczalność difenylortęci w wodzie odpowiednia wartość IC₅₀ nie może być określona. Wyniki badań za pomocą spektroskopii EPR pozwoliły na zaproponowanie prawdopodobnych miejsc działania związków rtęci w procesie fotosyntezy ferredoksyny po stronie akceptora PS 1 i chinonowego akceptora elektronów Q_A lub Q_B po stronie redukującej PS 2.

Słowa kluczowe

EN

EPR spectroscopy; organomercurials; photosynthetic electron transport

PL

spektroskopia EPR; organiczne związki rtęci; fotosyntetyczny transport elektronów

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. S
• Rocznik: 2013
• Tom: Vol. 20, nr 3
• Strony: 489--498
• Opis fizyczny: Bibliogr. 44 poz., tab., wykr., rys.

Twórcy

autor

Šeršeň F.

• Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina CH2, SK-84215 Bratislava, Slovak Republic

autor

Kráľová K.

• Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina CH2, SK-84215 Bratislava, Slovak Republic

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