Abstract
Abstract Excessive copper concentrations affect nutrient uptake in sensible species. However, the effects of copper on nutrient uptake in tolerant species have not been studied equally well. Thus, the main objective of this study was to determine the effect of rising Cu exposure on nutrient uptake rates and root/shoot nutrient contents in two species with distinct copper tolerance: Acacia caven (Mol.) Mol. and Helianthus annuus L. To this end, a hydroponic experiment was conducted. Copper treatments were applied at concentrations of 0, 2.0, 3.9, 7.9, and 15.7 μM. Relative root elongation was chosen as the endpoint for Cu toxicity assessment. The results of our study demonstrate that A. caven and H. annuus differ greatly in their tolerance to Cu. Copper concentration in the solution associated with the calculated EC25 was found to be six times higher in A. caven (15 μM) than in H. annuus (2.3 μM). When effective concentrations were instead based on the measured root Cu concentrations, the difference observed was ten times greater (1044 and 98 mg/kg for A. caven and H. annuus, respectively). Both species showed equal Cu uptake kinetics, with root absorbing power (α) of 7.5 ± 0.7 × 10–6 and 7.8 ± 0.5 × 10–6 cm s–1 for A. caven and H. annuus, respectively. Rising Cu concentrations in the exposure solution progressively diminished the influx of Ca into the roots of H. annuus, whereas no significant effect was noted for A. caven.
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Claims 8
Claim · model-written summary
Acacia reached EC25 at 15 μM Cu.
- Taxon
- A. caven
Vachellia cavene0 - Outcome
- EC25e0
- Value
- 15 μMe0
- Comparator
- H. annuuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC25 was found to be six times higher in A. caven (15 μM) than in H. annuus (2.3 μM)”
Claim · model-written summary
Sunflower reached EC25 at 2.3 μM Cu.
- Taxon
- H. annuus
Helianthus annuuse0 - Outcome
- EC25e0
- Value
- 2.3 μMe0
- Comparator
- A. cavene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC25 was found to be six times higher in A. caven (15 μM) than in H. annuus (2.3 μM)”
Claim · model-written summary
Root Cu based effective concentration was 1044 mg/kg for Acacia.
- Taxon
- A. cavenVachellia cavene0
- Outcome
- difference observede0
- Value
- 1044e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the difference observed was ten times greater (1044 and 98 mg/kg for A. caven and H. annuus, respectively)”
Claim · model-written summary
Root Cu based effective concentration was 98 mg/kg for sunflower.
- Taxon
- H. annuusHelianthus annuuse0
- Outcome
- difference observede0
- Value
- 98 mg/kge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the difference observed was ten times greater (1044 and 98 mg/kg for A. caven and H. annuus, respectively)”
Claim · model-written summary
Acacia root copper uptake power was 7.5 ± 0.7 × 10–6 cm s–1.
- Taxon
- A. cavenVachellia cavene0
- Outcome
- root absorbing powere0
- Value
- 7.5 ± 0.7 × 10–6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root absorbing power (α) of 7.5 ± 0.7 × 10–6 and 7.8 ± 0.5 × 10–6 cm s–1 for A. caven and H. annuus, respectively”
Claim · model-written summary
Sunflower root copper uptake power was 7.8 ± 0.5 × 10–6 cm s–1.
- Taxon
- H. annuusHelianthus annuuse0
- Outcome
- root absorbing powere0
- Value
- 7.8 ± 0.5 × 10–6 cm s–1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root absorbing power (α) of 7.5 ± 0.7 × 10–6 and 7.8 ± 0.5 × 10–6 cm s–1 for A. caven and H. annuus, respectively”
Claim · model-written summary
Increasing Cu exposure progressively reduced calcium influx into sunflower roots.
- Taxon
- H. annuusHelianthus annuuse0
- Organ / stage
- rootse0
- Treatment
- Rising Cu concentrationse0
- Outcome
- influx of Cae0
- Direction
- diminishede0
- Comparator
- exposure solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rising Cu concentrations in the exposure solution progressively diminished the influx of Ca into the roots of H. annuus”
Claim · model-written summary
Increasing Cu exposure had no significant effect on calcium influx in Acacia.
- Taxon
- A. cavenVachellia cavene0
- Outcome
- effecte0
- Direction
- no significant effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas no significant effect was noted for A. caven”
The same questions in other papers
copper atom · nutrient: content · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.