Abstract
In this study, we examined the relevance of polyphenols in the response of sunflower plants to acute Cu and Cd stresses. More specifically, we aimed to correlate spatially and temporally the accumulation of polyphenols with the occurrence of oxidative stress, and to estimate their contribution to the antioxidant capacities. Under our experimental conditions, the presence of Cu and Cd (75 µmol·L –1 ) in the nutrient solution caused oxidative damage, as detected by the accumulation of malondialdehyde, in roots of Cu-treated plants and in leaves of Cd-treated plants; in the latter, significant inhibition of photosynthesis also occurred. These effects were in agreement with the preferential accumulation of Cu in the roots and the greater translocation of Cd to the shoots. This oxidative damage was associated with a concerted plant response, characterized by stimulation of phenylalanine ammonia-lyase, ascorbate peroxidase, and guaiacol peroxidase activities, and by the accumulation of polyphenols whose concentrations were closely correlated (R 2 = 0.95) to the total antioxidant capacity of plants extracts. Globally, the co-occurrence of oxidative damages and polyphenol accumulation, and the correlations among polyphenol concentrations, total antioxidant capacities, and stimulations of the peroxidases support the involvement of polyphenols in protection against oxidative damage generated by Cu and Cd in plants.
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Claims 9
Claim · model-written summary
Copper exposure caused oxidative damage in sunflower roots.
- Taxon
- sunflower
Helianthus annuust0 - Organ / stage
- roots of Cu-treated plantse0
- Treatment
- Cue0
- Outcome
- oxidative damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the presence of Cu and Cd (75 µmol·L –1 ) in the nutrient solution caused oxidative damage, as detected by the accumulation of malondialdehyde, in roots of Cu-treated plants and in leaves of Cd-treated plants”
t0“sunflower”
Claim · model-written summary
Cadmium exposure caused oxidative damage in sunflower leaves.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- leaves of Cd-treated plantse0
- Treatment
- Cde0
- Outcome
- oxidative damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the presence of Cu and Cd (75 µmol·L –1 ) in the nutrient solution caused oxidative damage, as detected by the accumulation of malondialdehyde, in roots of Cu-treated plants and in leaves of Cd-treated plants”
t0“sunflower”
Claim · model-written summary
Cadmium treatment significantly inhibited photosynthesis.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Cd-treated plantse0
- Outcome
- photosynthesise0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in leaves of Cd-treated plants; in the latter, significant inhibition of photosynthesis also occurred”
t0“sunflower”
Claim · model-written summary
Copper preferentially accumulated in roots.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- accumulation of Cu in the rootse0
- Direction
- preferentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“preferential accumulation of Cu in the roots”
t0“sunflower”
Claim · model-written summary
Cadmium showed greater translocation to shoots.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- translocation of Cd to the shootse0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater translocation of Cd to the shoots”
t0“sunflower”
Claim · model-written summary
Oxidative damage coincided with stimulation of three enzyme activities.
- Taxon
- sunflowerHelianthus annuust0
- Gene
- phenylalanine ammonia-lyase, ascorbate peroxidase, and guaiacol peroxidasee0
- Outcome
- phenylalanine ammonia-lyase, ascorbate peroxidase, and guaiacol peroxidase activitiese0
- Direction
- stimulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This oxidative damage was associated with a concerted plant response, characterized by stimulation of phenylalanine ammonia-lyase, ascorbate peroxidase, and guaiacol peroxidase activities”
t0“sunflower”
Claim · model-written summary
Polyphenols accumulated with oxidative damage.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- accumulation of polyphenolse0
- Direction
- accumulatione0
- Qualifier
- oxidative damagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This oxidative damage was associated with a concerted plant response, characterized by stimulation of phenylalanine ammonia-lyase, ascorbate peroxidase, and guaiacol peroxidase activities, and by the accumulation of polyphenols”
t0“sunflower”
Claim · model-written summary
Polyphenol concentration closely correlated with total antioxidant capacity, R squared 0.95.
- Taxon
- sunflowerHelianthus annuust0
- Compound
- polyphenolse0
- Outcome
- total antioxidant capacity of plants extractse0
- Value
- R 2 = 0.95e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“polyphenols whose concentrations were closely correlated (R 2 = 0.95) to the total antioxidant capacity of plants extracts”
t0“sunflower”
Claim · model-written summary
Authors infer polyphenols protect against Cu and Cd oxidative damage.
- Taxon
- sunflowerHelianthus annuust0
- Compound
- polyphenolse0
- Outcome
- protection against oxidative damagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“support the involvement of polyphenols in protection against oxidative damage generated by Cu and Cd in plants”
t0“sunflower”
The same questions in other papers
copper atom · physiology: oxidative · Helianthus annuus (common sunflower)Results differ
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →cadmium atom · physiology: oxidative · Helianthus annuus (common sunflower)Results differ
9 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
7 papers more in this group
See all 11 papers →cadmium atom · physiology: photosynthesis · Helianthus annuus (common sunflower)Results agree
8 papers in the same direction as this paper
- no effect
- negative
- negative
5 papers more in this group
See all 9 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.