Abstract
Abstract The inhibitory effects of cadmium (CdSO 4 ) on the primary photosynthetic processes were studied in vivo in Pisum sativum by using Multi‐function Plant Efficiency Analyser (M‐PEA‐2). Photosynthetic parameters related to photosystem (PS) II, PS I and intersystem electron carriers were calculated from the light‐induced kinetics of prompt chlorophyll a fluorescence (OJIP transient), delayed chlorophyll a fluorescence (DF), and 820 nm modulated reflection (MR). Low‐dose exposure to cadmium (20 μ m CdSO 4 for 48 h) reduced probability of electron transfer from plastoquinones to the terminal electron acceptors of PSI ( δ Ro ) accompanied by a decrease in the rate of P 700 + and PC reduction ( V red ) and the magnitude of the I 2 step on the DF kinetics. Electron transport through PSI remained unaltered. The obtained results allowed us to propose existence of the potential site of inhibition of photosynthetic electron flow by cadmium between PSII and PSI. We propose to use parameters δ Ro , V red , and I 2 /I 1 as sensitive indicators of an early contamination by heavy metals.
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Claims 6
Claim · model-written summary
Cadmium reduced electron transfer probability from plastoquinones to terminal PSI acceptors.
- Taxon
- Pisum sativum
Lathyrus oleraceuse1 - Treatment
- cadmium (20 μ m CdSO 4 for 48 h)e0
- Outcome
- probability of electron transfer from plastoquinones to the terminal electron acceptors of PSIe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low‐dose exposure to cadmium (20 μ m CdSO 4 for 48 h) reduced probability of electron transfer from plastoquinones to the terminal electron acceptors of PSI ( δ Ro )”
e1“in vivo in Pisum sativum”
Claim · model-written summary
Cadmium decreased the rate of P700+ and PC reduction.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- cadmium (20 μ m CdSO 4 for 48 h)e0
- Outcome
- rate of P 700 + and PC reductione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low‐dose exposure to cadmium (20 μ m CdSO 4 for 48 h) reduced probability of electron transfer from plastoquinones to the terminal electron acceptors of PSI ( δ Ro ) accompanied by a decrease in the rate of P 700 + and PC reduction ( V red )”
e1“in vivo in Pisum sativum”
Claim · model-written summary
Cadmium decreased the I2 step magnitude in delayed fluorescence kinetics.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- cadmium (20 μ m CdSO 4 for 48 h)e0
- Outcome
- magnitude of the I 2 step on the DF kineticse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low‐dose exposure to cadmium (20 μ m CdSO 4 for 48 h) reduced probability of electron transfer from plastoquinones to the terminal electron acceptors of PSI ( δ Ro ) accompanied by a decrease in the rate of P 700 + and PC reduction ( V red ) and the magnitude of the I 2 step on the DF kinetics”
e1“in vivo in Pisum sativum”
Claim · model-written summary
Electron transport through PSI remained unchanged under cadmium exposure.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- cadmiume2
- Outcome
- Electron transport through PSIe0
- Direction
- remained unalterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electron transport through PSI remained unaltered.”
t0“Pea Plants”
e1“in vivo in Pisum sativum”
e2“inhibition of photosynthetic electron flow by cadmium between PSII and PSI”
Claim · model-written summary
The authors proposed a possible cadmium inhibition site between PSII and PSI.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- potential site of inhibition of photosynthetic electron flowe0
- Qualifier
- between PSII and PSIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potential site of inhibition of photosynthetic electron flow by cadmium between PSII and PSI”
e1“in vivo in Pisum sativum”
Claim · model-written summary
The authors proposed δRo, Vred and I2/I1 as indicators of early heavy-metal contamination.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- sensitive indicators of an early contamination by heavy metalse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We propose to use parameters δ Ro , V red , and I 2 /I 1 as sensitive indicators of an early contamination by heavy metals.”
e1“in vivo in Pisum sativum”
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See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.