Effect of magnesium and calcium ions on photoinduced lipid peroxidation and thylakoid breakdown of cell-free chloroplasts.
Indian J Biochem Biophys
;
1990 Jun; 27(3): 159-63
Artigo
em Inglês
| IMSEAR
| ID: sea-27789
ABSTRACT
Aging of cell-free chloroplasts at pH 7.0 and 9.0 causes a decline in the level of photosynthetic pigments, quenching of chlorophyll a fluorescence and enhancement in fluorescence polarization. These changes are correlated with photoinduced enhancement of thylakoid lipid peroxidation. The alkaline earth metal cations, namely magnesium and calcium, show opposite actions on lipid peroxidation and modulate thylakoid disorganisation differently. Magnesium ion may stabilise thylakoid membrane by retarding lipid peroxidation. It lowers aging-induced quenching of fluorescence intensity and enhancement of fluorescence polarization. Calcium ion, on the other hand, stimulates disorganisation of thylakoid membranes. It enhances membrane lipid peroxidation, quenching of chlorophyll a fluorescence intensity and fluorescence polarization.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Triticum
/
Peroxidação de Lipídeos
/
Sistema Livre de Células
/
Cloroplastos
/
Cálcio
/
Luz
/
Magnésio
/
Lipídeos de Membrana
Idioma:
Inglês
Revista:
Indian J Biochem Biophys
Ano de publicação:
1990
Tipo de documento:
Artigo
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