Abstract
Photosystem I activity of chloroplasts isolated from 21 days old maize seedlings ( Zea mays L. cv. Hidosil) cultivated in a nutrient solution containing different concentrations of Cd (10,20,30μM) was investigated. Cd markedly decreased ferredoxin(Fd)‐dependent NADP + photoreduction, while it had no effect on electron transport from 2. 6‐dichlorophenolindophenol to methyl viologen, indicating that the metal interferred with electron transport on the reducing side of photosystem I. The decrease in electron transport correlated with a low Fd content, which in turn was correlated with a low Fe concentration, suggesting Cd‐induced Fe deficiency. In in vitro experiments direct Cd inhibition of Fd‐dependent NADP + photoreduction required much higher Cd concentrations than those observed in Cd‐treated plants.
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Claims 5
Claim · model-written summary
Cd markedly decreased ferredoxin-dependent NADP photoreduction.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd markedly decreased ferredoxin(Fd)‐dependent NADP + photoreduction”
t0“maize”
Claim · model-written summary
Cd had no effect on electron transport to methyl viologen.
- Treatment
- Cde1
- Outcome
- electron transport from 2. 6‐dichlorophenolindophenol to methyl viologene0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it had no effect on electron transport from 2. 6‐dichlorophenolindophenol to methyl viologen”
e1“Cd markedly decreased ferredoxin(Fd)‐dependent NADP + photoreduction”
t0“maize”
Claim · model-written summary
Electron transport decrease correlated with low ferredoxin content.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in electron transport correlated with a low Fd content”
t0“maize”
Claim · model-written summary
Low ferredoxin content correlated with low iron concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a low Fd content, which in turn was correlated with a low Fe concentration”
t0“maize”
Claim · model-written summary
In vitro Cd inhibition required concentrations higher than observed in treated plants.
- Outcome
- Cd inhibition of Fd‐dependent NADP + photoreductione0
- Direction
- much highere0
- Comparator
- those observed in Cd‐treated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In in vitro experiments direct Cd inhibition of Fd‐dependent NADP + photoreduction required much higher Cd concentrations than those observed in Cd‐treated plants”
t0“maize”
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