Abstract
Abstract Maize ( Zea mays L. cv. 777) plants grown in hydroponic culture were treated with 100 µM NiSO 4 (moderate nickel (Ni) excess). In addition to growth parameters, metabolic parameters representative of antioxidant responses in leaves were assessed 24 h and 3, 7, and 14 d after initiating the Ni treatment. Extent of oxidative damage was measured as accumulation of malondialdehyde and hydrogen peroxide in leaves 7 and 14 d after treatment initiation. Apart from increasing membrane‐lipid peroxidation and H 2 O 2 accumulation, excess supply of Ni suppressed plant growth and dry mass of shoots but increased dry mass of roots and decreased the concentrations of chloroplastic pigments. Excess supply of Ni, though inhibited the catalase (EC 1.11.1.6) activity, increased peroxidase (EC 1.11.1.7), ascorbate peroxidase (EC 1.11.1.11), and superoxide dismutase (EC 1.15.1.1) activities. Localization of isoforms of these enzymes (peroxidase, ascorbate peroxidase, and superoxide dismutase) on native gels also revealed increases in the intensities of pre‐existing bands. Enhanced activities of peroxidase, ascorbate peroxidase, and superoxide dismutase, however, did not appear to be sufficient to ameliorate the effects of excessively generated reactive oxygen species due to excess supply of Ni.
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Claims 8
Claim · model-written summary
Excess nickel increased membrane lipid peroxidation and hydrogen peroxide accumulation.
- Treatment
- excess supply of Nie0
- Outcome
- membrane‐lipid peroxidation and H 2 O 2 accumulatione0
- Direction
- increasinge0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apart from increasing membrane‐lipid peroxidation and H 2 O 2 accumulation, excess supply of Ni suppressed plant growth”
t0“maize”
Claim · model-written summary
Excess nickel suppressed maize growth and shoot dry mass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess supply of Ni suppressed plant growth and dry mass of shoots”
t0“maize”
Claim · model-written summary
Excess nickel increased root dry mass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess supply of Ni suppressed plant growth and dry mass of shoots but increased dry mass of roots”
t0“maize”
Claim · model-written summary
Excess nickel decreased chloroplastic pigment concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess supply of Ni suppressed plant growth and dry mass of shoots but increased dry mass of roots and decreased the concentrations of chloroplastic pigments”
t0“maize”
Claim · model-written summary
Excess nickel inhibited catalase activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excess supply of Ni, though inhibited the catalase (EC 1.11.1.6) activity”
t0“maize”
Claim · model-written summary
Excess nickel increased peroxidase, ascorbate peroxidase and superoxide dismutase activities.
- Treatment
- Excess supply of Nie0
- Outcome
- peroxidase (EC 1.11.1.7), ascorbate peroxidase (EC 1.11.1.11), and superoxide dismutase (EC 1.15.1.1) activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excess supply of Ni, though inhibited the catalase (EC 1.11.1.6) activity, increased peroxidase (EC 1.11.1.7), ascorbate peroxidase (EC 1.11.1.11), and superoxide dismutase (EC 1.15.1.1) activities”
t0“maize”
Claim · model-written summary
Native gels showed increased intensity of pre-existing peroxidase, ascorbate peroxidase and superoxide dismutase isoform bands.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Localization of isoforms of these enzymes (peroxidase, ascorbate peroxidase, and superoxide dismutase) on native gels also revealed increases in the intensities of pre‐existing bands”
t0“maize”
Claim · model-written summary
The increased enzyme activities appeared insufficient to ameliorate the effects of excessive reactive oxygen species.
- Treatment
- excess supply of Nie0
- Outcome
- effects of excessively generated reactive oxygen speciese0
- Qualifier
- did not appear to be sufficient to amelioratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enhanced activities of peroxidase, ascorbate peroxidase, and superoxide dismutase, however, did not appear to be sufficient to ameliorate the effects of excessively generated reactive oxygen species due to excess supply of Ni”
t0“maize”
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See all 7 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.