Abstract
Heavy metal as Cd can antagonise uptake and transport of other metal elements such as Mn, Zn, and Fe in leaves of Vicia faba L. concentrations of Cd or Zn up to 100 µM remarkably decreased chlorophyll content compared to control. The degradation in Chl. b under such stress was slower than that of Chl. a. and Cd had more inhibitory effect on both pigments than Zn even under low concentration (50 µM). The results cleared that Zn can strongly antagonise this toxic effect of Cd especially with high Zn concentrations and where full protection and restoration of chlorophyll levels was recorded. Measurements of Na, Mg, P, K, Ca, Cu, Al, Mn, and Zn bounded to the cell membrane, revealed a significant decrease of Ca, K and Mg in the presence of Cd or Zn, also the disappearance of Fe peak was observed at 100 µM Cd. This could be due to Cd ions interaction with the manganese cluster which is present in the evolving complex on the donor side of PSΠ. The effect of metal toxicity for Zn and or Cd, in this study, could be observed in many damages to the cell organelle ultrastructure. Changes in chloroplast ultrastructure and lipid composition of the thylakoid membranes alter the operability of the photosynthetic electron transport chain. The chloroplast treated with 100 µM Cd has a reduced number of intact grana, as well as reduced chloroplast size. Combined treatment of cadmium and zinc led to more changes in the shape of cellular components, such as, the shape of chloroplasts was almost spherical, the grana were completely damaged and a large part of chloroplast appeared with disturbed envelopes. Increasing Zn over Cd concentration treatment acquired beneficial effect as it can successfully antagonize the harmful effect of Cd.
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Claims 8
Claim · model-written summary
Cd or Zn up to 100 µM decreased chlorophyll content.
- Taxon
- Vicia faba L.
Vicia fabat0 - Treatment
- Cd or Zn up to 100 µMe0
- Outcome
- concentrations of Cd or Zn up to 100 µM remarkably decreased chlorophyll content compared to control.e0
- Direction
- decreasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentrations of Cd or Zn up to 100 µM remarkably decreased chlorophyll content compared to control.”
t0“VICIA FABA L.”
Claim · model-written summary
Chlorophyll b degradation was slower than chlorophyll a degradation.
Verbatim
e0“The degradation in Chl. b under such stress was slower than that of Chl. a.”
t0“VICIA FABA L.”
Claim · model-written summary
Cd inhibited both pigments more than Zn.
Verbatim
e0“Cd had more inhibitory effect on both pigments than Zn even under low concentration (50 µM).”
t0“VICIA FABA L.”
Claim · model-written summary
Zn antagonized Cd toxicity and restored chlorophyll at high concentrations.
Verbatim
e0“Zn can strongly antagonise this toxic effect of Cd especially with high Zn concentrations and where full protection and restoration of chlorophyll levels was recorded.”
t0“VICIA FABA L.”
Claim · model-written summary
Cd or Zn significantly decreased membrane-bound Ca, K and Mg.
Verbatim
e0“revealed a significant decrease of Ca, K and Mg in the presence of Cd or Zn”
t0“VICIA FABA L.”
Claim · model-written summary
The Fe peak disappeared under 100 µM Cd.
Verbatim
e0“the disappearance of Fe peak was observed at 100 µM Cd.”
t0“VICIA FABA L.”
Claim · model-written summary
Cd reduced intact grana number and chloroplast size.
Verbatim
e0“The chloroplast treated with 100 µM Cd has a reduced number of intact grana, as well as reduced chloroplast size.”
t0“VICIA FABA L.”
Claim · model-written summary
Combined Cd and Zn damaged grana and chloroplast envelopes.
- Taxon
- VICIA FABA L.t0
- Treatment
- cadmium and zince0
- Outcome
- Combined treatment of cadmium and zinc led to more changes in the shape of cellular components, such as, the shape of chloroplasts was almost spherical, the grana were completely damaged and a large part of chloroplast appeared with disturbed envelopes.e0
Verbatim
e0“Combined treatment of cadmium and zinc led to more changes in the shape of cellular components, such as, the shape of chloroplasts was almost spherical, the grana were completely damaged and a large part of chloroplast appeared with disturbed envelopes.”
t0“VICIA FABA L.”
The same questions in other papers
zinc atom · physiology: pigments · Vicia faba (faba bean)Results differ
2 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →cadmium atom · physiology: pigments · Vicia faba (faba bean)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.