Abstract
Fluorescence and electron paramagnetic resonance measurements were used to study selenium influence on photosystem activity in rape seedlings affected by Cd stress. Water cultures containing Hoagland nutrients were supplemented with 400 μM of CdCl2, 2 μM of Na2SeO4 and a mixture of both CdCl2 and Na2SeO4. The seedlings were cultured till the first leaf reached about 1 cm in length. Cadmium-induced changes in the activity of both photosystems were partly diminished by Se presence in the nutrient medium. Electron microscopy photographs confirmed less degradation in chloroplasts of plants cultured on media containing Se. It is suggested that sucrose groups of starch, which is deposited in greater amounts in Cd-stressed plants, may act as traps for free radicals produced under those conditions.
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Abbreviations
- A:
-
Constant of hyperfine splitting (HFS)
- ABS/CS:
-
Light energy absorbed by leaf cross-section (CS).
- DFT:
-
Density-functional theory
- ETo/ABS:
-
Probability that an absorbed photon will move an electron into the electron transport chain
- ETo/CS:
-
Quantum yield of photosynthetic electron transport chain after QA per CS
- ETo/TRo :
-
Efficiency with which a trapped exciton can move an electron into the electron transport chain
- Fm′:
-
Fluorescence with all PSII reaction centres closed in light-exposed leaves
- Fo′:
-
Fluorescence in leaves previously exposed to light, darkened just before measurement
- Fs :
-
Steady-state fluorescence in light-exposed leaves
- Fv′/Fm′:
-
PS2 antenna trapping efficiency
- Fv′:
-
Variable fluorescence in light-adapted leaves (Fv′ = Fm′ − Fo′)
- g :
-
Values of g tensor
- NPQ:
-
Non-photochemical quenching of chlorophyll a fluorescence
- OEC:
-
Fraction of O2 evolving centres PS2 in comparison with the control sample
- PI(CS) :
-
Performance index, defined on a cross section (CS) basis
- PPFD:
-
Photosynthetic photon flux density
- PS2:
-
Photosystem II
- *QA :
-
The first stable electron acceptor in PS2
- qP:
-
Photochemical quenching of chlorophyll a fluorescence
- RC/CS:
-
Number of active reaction centres (RC) in the state of fully reduced PS2 RC
- Sm:
-
The working integral of the energy needed to close all RCs
- Sm/t Fmax :
-
Expresses the average (av) redox state (QA −/QA) in the time span from 0 to Fmax and therefore, the average fraction of open (op) RC during the time needed to complete the closure (cl) of all the RC; Sm/t Fmax = [RCop/(RCcl + RCop)]av
- TRo/ABS:
-
Maximum quantum yield of primary photochemistry
- TRo/CS:
-
Quantum yield of primary photochemistry (from RC to QA) per CS
- ΦPS2 :
-
Quantum yield of PS2 photochemistry
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Filek, M., Kościelniak, J., Łabanowska, M. et al. Selenium-induced protection of photosynthesis activity in rape (Brassica napus) seedlings subjected to cadmium stress. Fluorescence and EPR measurements. Photosynth Res 105, 27–37 (2010). https://doi.org/10.1007/s11120-010-9551-y
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DOI: https://doi.org/10.1007/s11120-010-9551-y