Abstract
Abstract The wide use of copper (Cu)-based fungicide has caused a stepwise accumulation of Cu in the environment increasing the occurrence of phytotoxicity in crops. To understand and alleviate this abiotic stress, maize seedlings were grown in hydroponic solution with different combinations of Cu and iron (Fe) forms. Results showed that maize Cu sensitivity is related to the nature of the form supplied and to the chelate-exchange processes that might involve other elements, such as Fe. The use of CuSO 4 excess (100 µM) caused severe reduction of plant growth, over accumulation of Cu, high activity of antioxidant enzymes, and impairment of the acquisition of other nutrients. In presence of chelating agents (citrate and ethylenediaminetetraacetic acid, EDTA) the ability of plants to tolerate high Cu-levels depends on the Fe nutritional status. Copper phytotoxicity symptoms do not occur when Cu was supplied chelated by EDTA. The use of synthetic agent EDTA (as Cu-EDTA and Fe-EDTA) prevented the accumulation of toxic Cu-level in plants and allowed a better homeostasis among nutrients. In presence of citrate, high concentration of Cu occurred in plants but its phytotoxicity was limited when even EDTA was available in solution. Results suggest that maize plants can operate a good control of nutritional status when Cu-excess is present concomitantly with a synthetic chelator (as EDTA) even when supplied as a Fe-fertilizer. These results pave the way to provide guidelines for the fertilization managements on Cu-contaminated soils to alleviate phytotoxicity in crops.
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Claims 5
Claim · model-written summary
Excess CuSO 4 reduced maize growth and nutrient acquisition and increased Cu accumulation and antioxidant activity.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of CuSO 4 excess (100 µM) caused severe reduction of plant growth, over accumulation of Cu, high activity of antioxidant enzymes, and impairment of the acquisition of other nutrients.”
t0“Maize”
Claim · model-written summary
Cu tolerance with chelators depended on Fe nutritional status.
- Treatment
- chelating agents (citrate and ethylenediaminetetraacetic acid, EDTA)e0
- Outcome
- ability of plants to tolerate high Cu-levelse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In presence of chelating agents (citrate and ethylenediaminetetraacetic acid, EDTA) the ability of plants to tolerate high Cu-levels depends on the Fe nutritional status.”
t0“Maize”
Claim · model-written summary
Cu chelated by EDTA produced no phytotoxic symptoms.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Copper phytotoxicity symptoms do not occur when Cu was supplied chelated by EDTA.”
t0“Maize”
Claim · model-written summary
EDTA prevented toxic Cu accumulation and improved nutrient homeostasis.
- Treatment
- synthetic agent EDTA (as Cu-EDTA and Fe-EDTA)e0
- Outcome
- accumulation of toxic Cu-levele0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of synthetic agent EDTA (as Cu-EDTA and Fe-EDTA) prevented the accumulation of toxic Cu-level in plants and allowed a better homeostasis among nutrients.”
t0“Maize”
Claim · model-written summary
Citrate coincided with high plant Cu but EDTA limited its phytotoxicity.
- Treatment
- EDTA was available in solutione0
- Outcome
- phytotoxicitye0
- Direction
- limitede0
- Qualifier
- In presence of citratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In presence of citrate, high concentration of Cu occurred in plants but its phytotoxicity was limited when even EDTA was available in solution.”
t0“Maize”
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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.