The effect of additional red irradiation on the photosynthetic apparatus of <Emphasis Type="Italic">Pisum sativum</Emphasis> |
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Authors: | N M Topchiy S K Sytnik O O Syvash O K Zolotareva |
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Institution: | (1) M.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, 2 Tereschenkivska Str., 01004 Kyiv, Ukraine |
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Abstract: | Pisum sativum (L.) plants were grown under “white” luminescent lamps, W 45 μ mol(quantum) m−2 s−1] or under the same irradiation supplemented with narrow spectrum red light-emitting diodes (LEDs), RE λmax = 660 nm, Δλ = 20 nm, 40 μmol(quantum) m−2 s−1]. Significant differences in the chlorophyll (Chl) a fluorescence parameters, degree of State 1–State 2 transition, and the pigment-protein contents were found in plants grown
under differing spectral composition. Addition of red LEDs to the “white light” resulted in higher effective quantum yield
of photosystem 2 (PS2), i.e. F′v/F′m, linear electron transport (ϕPS2), photochemical quenching (qP), and lower non-photochemical quenching (qN as well as NPQ). The RE plants were characterised by higher degree State 1–State 2 transition, i.e. they were more effective in radiant energy utilisation. Judging from the data of “green” electrophoresis of Chl containing
pigment-protein complexes of plants grown under various irradiation qualities, the percentage of Chl in photosystem 2 (PS2)
reaction centre complexes in RE plants was higher and there was no difference in the total Chl bound with Chl-proteins of
light-harvesting complexes (LHC2). Because the ratio between oligomeric and monomeric LHC2 forms was higher in RE plants,
we suggest higher LHC2 stability in these ones. |
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Keywords: | chlorophyll light-emitting diodes light-harvesting complex non-photochemical quenching photosystem 2 Pisum sativum photochemical quenching spectral composition of radiation |
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