Effects of lanthanum and calcium on photoelectron transport activity and the related protein complexes in chloroplast of cucumber leaves
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The effects of lanthanum and calcium ions on electron transport, dichlorephenol indophenol (DCIP) photoreduction, and oxygen evolution activities in chloroplast from cucumber (Cucumis satives L.) were determined. The lanthanum inhibited the whole electron chain-transport activity of chloroplast. DCIP photoreduction and oxygen evolution activities of the photosystem I (PSII) also decrease after treatment with La3+. But the diminished activities of PSII and chloroplast caused by La3+ could be reversed by Ca2+ and even became higher than the control level. The concentration analysis of related protein complexes to photoelectron transport in chloroplast included that La3+ induced the concentration of chlorophyll protein complexes increasing but caused some nonchlorophyll protein complexes to decompose partially. This increasing effect of La3+ on chlorophyll protein complexes results in the improvement of chlorophyll content, which will improve the absorption of photoelectron and energy transport in the process of photosynthesis.
Index EntriesLanthanum calcium photoelectron transport chloroplast photosystem protein complexes cucumber
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- 1.C. H. Evans, Biochemistry of the Lanthanide, E. Frieden, ed., Plenum, New York (1990).Google Scholar
- 2.L. J. MacDonald and M. D. Mamarack, Phosphoinositide hydrolysis by phospholipase C modulated by multivalent cations La3+, Al3+, neomytin, polyamines and melittin, J. Lipid Mediat. Cell Signal. 11, 82–91 (1995).Google Scholar
- 5.D. F. Ghanotakis, G. T. Babcock, and C. F. Yocum, Structure of the oxygen evolving complex of photosystem II: calcium and lanthanum compete for sites on the oxidizing site of photosystem II which control the binding of water-soluble polypeptides and regulate the activity of the manganese complex, Biochim. Biophys. Acta 809, 173–180 (1985).CrossRefGoogle Scholar
- 6.F. J. Asturias and R. F. Fischetti, Changes in the profile structure of the secro-plasmic reticium membrane induced by phosphorylation of the Ca2+-ATPase in the presence of terbium, Biophysiol. J. 65, 1651–1664 (1994).Google Scholar
- 11.A. S. Holt and C. S. French, Oxygen production by illuminated chloroplasts suspended in solutions of oxidants, Arch. Biochem. Biophys. 19, 368–378 (1948).Google Scholar