Abstract
Treatment with 50 microM CuSO4 for five days caused significant decrease in dry-matter production and protein level of ten-day-old sunflower seedling roots. An increase of lipoperoxidation product rate was also observed. The involvement of some enzyme activities in the sunflower root defence against Cu-induced oxidative stress was studied. Copper treatment induced several changes in antioxidant enzymes. SOD (superoxide dismutase, EC 1.15.1.1) activity was reduced but CAT (catalase, EC 1.11.1.6) and GPX (guaiacol peroxidase, EC 1.11.1.7) activities were significantly enhanced. The lignifying peroxidase activities, assayed using coniferyl alcohol and syringaldazine, were also stimulated. Analysis by native gel electrophoresis of syringaldazine peroxidase activity showed the stimulation of an isoform (A2) and the induction of another one (A1) under cupric stress conditions. On the other hand, the activity of PAL (phenylalanine ammonia lyase, EC 4.3.1.5), which plays an important role in plant defence, was also activated. The possible mechanisms by which Cu-induced growth delay and changes in enzymatic activities involved in plant defence processes are discussed.
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Claims 10
Claim · model-written summary
Copper treatment significantly decreased root dry matter production.
- Taxon
- sunflower
Helianthus annuuse0 - Organ / stage
- ten-day-old sunflower seedling rootse0
- Treatment
- 50 microM CuSO4 for five dayse0
- Outcome
- dry-matter productione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with 50 microM CuSO4 for five days caused significant decrease in dry-matter production and protein level of ten-day-old sunflower seedling roots.”
Claim · model-written summary
Copper treatment significantly decreased root protein level.
- Taxon
- sunflowerHelianthus annuuse0
- Organ / stage
- ten-day-old sunflower seedling rootse0
- Treatment
- 50 microM CuSO4 for five dayse0
- Outcome
- protein levele0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with 50 microM CuSO4 for five days caused significant decrease in dry-matter production and protein level of ten-day-old sunflower seedling roots.”
Claim · model-written summary
Copper treatment increased lipoperoxidation product rate.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- copper excesst0
- Outcome
- lipoperoxidation product ratee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase of lipoperoxidation product rate was also observed.”
t0“sunflower roots (Helianthus annuus L.) stressed with copper excess”
Claim · model-written summary
Copper treatment reduced SOD activity.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- copper excesst0
- Gene
- SOD (superoxide dismutase, EC 1.15.1.1)e0
- Outcome
- SOD (superoxide dismutase, EC 1.15.1.1) activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD (superoxide dismutase, EC 1.15.1.1) activity was reduced but CAT (catalase, EC 1.11.1.6) and GPX (guaiacol peroxidase, EC 1.11.1.7) activities were significantly enhanced.”
t0“sunflower roots (Helianthus annuus L.) stressed with copper excess”
Claim · model-written summary
Copper treatment significantly enhanced CAT activity.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- copper excesst0
- Gene
- CAT (catalase, EC 1.11.1.6)e0
- Outcome
- CAT (catalase, EC 1.11.1.6)e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD (superoxide dismutase, EC 1.15.1.1) activity was reduced but CAT (catalase, EC 1.11.1.6) and GPX (guaiacol peroxidase, EC 1.11.1.7) activities were significantly enhanced.”
t0“sunflower roots (Helianthus annuus L.) stressed with copper excess”
Claim · model-written summary
Copper treatment significantly enhanced GPX activity.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- copper excesst0
- Gene
- GPX (guaiacol peroxidase, EC 1.11.1.7)e0
- Outcome
- GPX (guaiacol peroxidase, EC 1.11.1.7) activitiese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD (superoxide dismutase, EC 1.15.1.1) activity was reduced but CAT (catalase, EC 1.11.1.6) and GPX (guaiacol peroxidase, EC 1.11.1.7) activities were significantly enhanced.”
t0“sunflower roots (Helianthus annuus L.) stressed with copper excess”
Claim · model-written summary
Copper stimulated lignifying peroxidase activities assayed with coniferyl alcohol and syringaldazine.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- copper excesst0
- Gene
- lignifying peroxidasee0
- Outcome
- lignifying peroxidase activitiese0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lignifying peroxidase activities, assayed using coniferyl alcohol and syringaldazine, were also stimulated.”
t0“sunflower roots (Helianthus annuus L.) stressed with copper excess”
Claim · model-written summary
Copper stimulated syringaldazine peroxidase isoform A2.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- cupric stress conditionse0
- Gene
- isoform (A2)e0
- Outcome
- stimulation of an isoform (A2)e0
- Direction
- stimulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis by native gel electrophoresis of syringaldazine peroxidase activity showed the stimulation of an isoform (A2) and the induction of another one (A1) under cupric stress conditions.”
t0“sunflower roots (Helianthus annuus L.)”
Claim · model-written summary
Copper induced syringaldazine peroxidase isoform A1.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- cupric stress conditionse0
- Gene
- (A1)e0
- Outcome
- induction of another one (A1)e0
- Direction
- inductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis by native gel electrophoresis of syringaldazine peroxidase activity showed the stimulation of an isoform (A2) and the induction of another one (A1) under cupric stress conditions.”
t0“sunflower roots (Helianthus annuus L.)”
Claim · model-written summary
Copper activated PAL activity.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- copper excesst0
- Gene
- PAL (phenylalanine ammonia lyase, EC 4.3.1.5)e0
- Outcome
- activity of PALe0
- Direction
- activatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of PAL (phenylalanine ammonia lyase, EC 4.3.1.5), which plays an important role in plant defence, was also activated.”
t0“sunflower roots (Helianthus annuus L.) stressed with copper excess”
The same questions in other papers
copper atom · physiology: antioxidant enzymes · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.