Abstract
Sunflower plants ( Helianthus annuus ) are recognized for their potential in soil decontamination due to their high capacity for biomass production and ion accumulation, making them promising candidates for phytoremediation of heavy metals. This study aimed to evaluate the tolerance of Brazilian sunflower cultivars BRS415 and BRS323 to 150, 180, 240, 300, 900, and 4400 mg kg − 1 of Pb(NO 3 ) 2 in artificially contaminated soil. To evaluate the phytoremediation potential, we investigated the physiological and chemical parameters of the plants, and analyzed the oxidative enzyme activity. The cultivars were assessed for physiological parameters, chlorophyll content, ATP concentration, heavy metal tolerance, and antioxidant potential after a 30-day cultivation period. The plant showed excellent structural development with 900 mg kg⁻¹ of lead compared to the lower concentrations and demonstrated a strong ability to transfer the contaminant to its structures, primarily retaining it in the roots. Chlorophyll a content at Pb900 was close to that of the control, and ATP levels increased by 62% (Pb150) and 77% (Pb900) compared to the control. The cultivar also exhibited strong activation of its antioxidant defense system, with catalase (CAT) and ascorbate peroxidase (APX) showing elevated enzymatic activity in all plant parts at Pb900. Guaiacol peroxidase (G-POX) was also highly active, contributing to the formation of structural and functional barriers that reduced metal translocation within the plant. These findings demonstrate that the Brazilian hybrid BRS323 possesses a significant ability to thrive under lead stress, supported by a complex and efficient biochemical defense network throughout the phytoremediation process. .
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
At 900 mg kg⁻¹ lead, the plant developed structurally better than at lower concentrations.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- 900 mg kg⁻¹ of leade0
- Outcome
- structural developmente0
- Direction
- excellente0
- Comparator
- lower concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant showed excellent structural development with 900 mg kg⁻¹ of lead compared to the lower concentrations”
t0“sunflower cultivars”
Claim · model-written summary
The plant transferred lead into its structures and retained it mainly in roots.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- rootse0
- Outcome
- transfer the contaminant to its structurese0
- Qualifier
- primarily retaining it in the rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“demonstrated a strong ability to transfer the contaminant to its structures, primarily retaining it in the roots”
t0“sunflower cultivars”
Claim · model-written summary
Chlorophyll a content at Pb900 was close to control.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Pb900e0
- Outcome
- Chlorophyll a contente0
- Direction
- close toe0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll a content at Pb900 was close to that of the control”
t0“sunflower cultivars”
Claim · model-written summary
ATP levels increased 62% at Pb150 relative to control.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Pb150e0
- Outcome
- ATP levelse0
- Direction
- increasede0
- Value
- 62%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATP levels increased by 62% (Pb150) and 77% (Pb900) compared to the control”
t0“sunflower cultivars”
Claim · model-written summary
ATP levels increased 77% at Pb900 relative to control.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Pb900e0
- Outcome
- ATP levelse0
- Direction
- increasede0
- Value
- 77%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATP levels increased by 62% (Pb150) and 77% (Pb900) compared to the control”
t0“sunflower cultivars”
Claim · model-written summary
Catalase activity was elevated in all plant parts at Pb900.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- all plant partse0
- Treatment
- Pb900e0
- Gene
- catalase (CAT)e0
- Outcome
- catalase (CAT)e0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“catalase (CAT) and ascorbate peroxidase (APX) showing elevated enzymatic activity in all plant parts at Pb900”
t0“sunflower cultivars”
Claim · model-written summary
Ascorbate peroxidase activity was elevated in all plant parts at Pb900.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- all plant partse0
- Treatment
- Pb900e0
- Gene
- ascorbate peroxidase (APX)e0
- Outcome
- ascorbate peroxidase (APX)e0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“catalase (CAT) and ascorbate peroxidase (APX) showing elevated enzymatic activity in all plant parts at Pb900”
t0“sunflower cultivars”
Claim · model-written summary
Guaiacol peroxidase was highly active and was linked to barriers reducing metal translocation.
- Taxon
- sunflowerHelianthus annuust0
- Gene
- Guaiacol peroxidase (G-POX)e0
- Outcome
- metal translocation within the plante0
- Direction
- reducede0
- Qualifier
- formation of structural and functional barrierse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Guaiacol peroxidase (G-POX) was also highly active, contributing to the formation of structural and functional barriers that reduced metal translocation within the plant”
t0“sunflower cultivars”
Claim · model-written summary
The authors concluded BRS323 can thrive under lead stress.
- Taxon
- sunflowerHelianthus annuust0
- Material
- BRS323e0
- Outcome
- ability to thrive under lead stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Brazilian hybrid BRS323 possesses a significant ability to thrive under lead stress”
t0“sunflower cultivars”
The same questions in other papers
lead atom · growth · Helianthus annuus (common sunflower)Results differ
2 papers in the same direction as this paper · 11 in the opposite direction
- negative
- negative
- negative
10 papers more in this group
See all 14 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.