Abstract
The effects of suspensions of cerium oxide nanoparticles sprayed onto marigold seedlings (Calendula officinalis L.) at concentrations between 50 and 3200 mg L−1 were studied. At concentrations of 50 and 100 mg L−1, the nanoparticles had a slight positive effect on some growth parameters, but at higher concentrations they caused severe oxidative damage. Activities of phenylalanine ammonia lyase and lipoxygenase increased from 400 mg L−1 upward, tyrosine ammonia lyase from 1600 mg L−1. Ascorbate and glutathione contents decreased from 400 mg L−1 upwards.
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Claims 5
Claim · model-written summary
Cerium oxide nanoparticles at 50 and 100 mg L−1 had a slight positive effect on some growth parameters of marigold seedlings.
- Taxon
- marigoldt0
- Treatment
- cerium oxide nanoparticlest0
- Outcome
- some growth parameterse0
- Direction
- slight positive effecte0
- Qualifier
- 50 and 100 mg L−1e0
Not reportedComparator
Verbatim
t0“cerium oxide nanoparticles on biochemical and oxidative parameters in marigold leaves”
e0“At concentrations of 50 and 100 mg L−1, the nanoparticles had a slight positive effect on some growth parameters”
Claim · model-written summary
At higher concentrations the nanoparticles caused severe oxidative damage in marigold.
- Taxon
- marigoldt0
- Treatment
- cerium oxide nanoparticlest0
- Outcome
- oxidative damagee0
- Direction
- increaseinferrede0
- Qualifier
- higher concentrationse0
Not reportedComparator
Verbatim
t0“cerium oxide nanoparticles on biochemical and oxidative parameters in marigold leaves”
e0“but at higher concentrations they caused severe oxidative damage”
Claim · model-written summary
Activities of phenylalanine ammonia lyase and lipoxygenase increased from 400 mg L−1 upward.
- Taxon
- marigoldt0
- Treatment
- cerium oxide nanoparticlest0
- Outcome
- Activities of phenylalanine ammonia lyase and lipoxygenasee0
- Direction
- increasede0
- Qualifier
- from 400 mg L−1 upwarde0
Not reportedComparator
Verbatim
t0“cerium oxide nanoparticles on biochemical and oxidative parameters in marigold leaves”
e0“Activities of phenylalanine ammonia lyase and lipoxygenase increased from 400 mg L−1 upward”
Claim · model-written summary
Tyrosine ammonia lyase activity increased from 1600 mg L−1.
- Taxon
- marigoldt0
- Treatment
- cerium oxide nanoparticlest0
- Outcome
- tyrosine ammonia lyasee0
- Direction
- increasede0
- Qualifier
- from 1600 mg L−1e0
Not reportedComparator
Verbatim
t0“cerium oxide nanoparticles on biochemical and oxidative parameters in marigold leaves”
e0“Activities of phenylalanine ammonia lyase and lipoxygenase increased from 400 mg L−1 upward, tyrosine ammonia lyase from 1600 mg L−1”
Claim · model-written summary
Ascorbate and glutathione contents decreased from 400 mg L−1 upwards.
- Taxon
- marigoldt0
- Treatment
- cerium oxide nanoparticlest0
- Outcome
- Ascorbate and glutathione contentse0
- Direction
- decreasede0
- Qualifier
- from 400 mg L−1 upwardse0
Not reportedComparator
Verbatim
t0“cerium oxide nanoparticles on biochemical and oxidative parameters in marigold leaves”
e0“Ascorbate and glutathione contents decreased from 400 mg L−1 upwards”
The same questions in other papers
nanoparticle · physiology: oxidative · Tagetes (marigolds)Positive and negative results
1 in the opposite direction
- positive
nanoparticle · growth · Tagetes (marigolds)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.