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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Abbreviations
- Chl:
-
chlorophyll
- F0 :
-
ground value of fluorescence
- Fv, Fm :
-
variable and maximum fluorescence in the dark-adapted state, respectively
- Fv/Fm :
-
maximum quantum efficiency of PS2 photochemistry
- F′v/F′m :
-
maximum quantum efficiency of PS2 under given irradiance
- LEDs:
-
light-emitting diodes
- LHC2:
-
light-harvesting complexes of PS2
- PS:
-
photosystem
- QA:
-
primary quinone of PS2
- qP, qN :
-
photochemical and non-photochemical quenching of chlorophyll fluorescence, respectively
- RE:
-
red-enriched “white growth light”
- W:
-
“white growth light”
- ϕPS2 :
-
quantum efficiency of linear electron transport through PS2
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Topchiy, N.M., Sytnik, S.K., Syvash, O.O. et al. The effect of additional red irradiation on the photosynthetic apparatus of Pisum sativum . Photosynthetica 43, 451–456 (2005). https://doi.org/10.1007/s11099-005-0072-4
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DOI: https://doi.org/10.1007/s11099-005-0072-4