Effects of lanthanum and calcium on photoelectron transport activity and the related protein complexes in chloroplast of cucumber leaves |
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| Authors: | Fuli Zeng Yi An Li Ren Ruwen Deng Mingfeng Zhang |
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| Institution: | (1) Department of Biology, Lanzhou University, 730000 Lanzhou, China;(2) Department of Chemistry, Lanzhou University, 730000 Lanzhou, China |
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| Abstract: | 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. |
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| Keywords: | Lanthanum calcium photoelectron transport chloroplast photosystem protein complexes cucumber |
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