Abstract
In order to explore the possible physiological mechanisms of calcium involved in improving adaptation to nickel stress in plants,the effects of external calcium(Ca2+)on the activities of superoxide dismutase(SOD),catalase(CAT),peroxidase(POD)and ascorbate peroxidase(APX),the contents of H2O2 and malondialdehyde(MDA),and electrolyte leakage of leaf tissues were investigated in nickel-stressed rice seedlings.Under 0.1 mmol/L nickel(Ni2+)treatment,the activities of SOD,CAT and APX in rice leaf tissues were significantly decreased,while the activity of POD was obviously enhanced.Moreover,nickel treatments significantly increased the contents of H2O2 and MDA in rice leaf tissues,suggesting oxidative damage and membrane peroxidation occurred in nickel-treated leaf tissues.External calcium promoted the activities of SOD,CAT,APX and POD,but reduced considerably H2O2 and MDA contents and permeability of cell membrane in leaf tissues during the stress period.In addition,the activities of CAT,SOD,POD and APX in 10 mmol/L Ca2+-supplemented leaf tissues were higher,and H2O2 and MDA contents were lesser than those in 5 mmol/L Ca2+ under the nickel stress.It was suggested that one of the mechanisms that external calcium enhanced the tolerance to nickel toxicity in rice seedlings was mediated by improving scavenging of active oxygen species and maintaining the integrity of cell membrane under nickel stress.
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Claims 9
Claim · model-written summary
Nickel significantly reduced SOD, CAT and APX activities in rice leaves.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- rice leaf tissuese0
- Treatment
- 0.1 mmol/L nickel(Ni2+)treatmente0
- Outcome
- activities of SOD,CAT and APXe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under 0.1 mmol/L nickel(Ni2+)treatment,the activities of SOD,CAT and APX in rice leaf tissues were significantly decreased”
t0“Rice Seedlings”
Claim · model-written summary
Nickel enhanced POD activity in rice leaves.
- Taxon
- RiceOryza sativat0
- Treatment
- 0.1 mmol/L nickel(Ni2+)treatmente1
- Outcome
- activity of PODe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while the activity of POD was obviously enhanced.”
e1“Under 0.1 mmol/L nickel(Ni2+)treatment”
t0“Rice Seedlings”
Claim · model-written summary
Nickel increased H2O2 and MDA content in rice leaves.
- Taxon
- RiceOryza sativat0
- Organ / stage
- rice leaf tissuese0
- Treatment
- nickel treatmentse0
- Outcome
- contents of H2O2 and MDAe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nickel treatments significantly increased the contents of H2O2 and MDA in rice leaf tissues”
t0“Rice Seedlings”
Claim · model-written summary
External calcium increased SOD, CAT, APX and POD activities under nickel stress.
- Taxon
- RiceOryza sativat0
- Treatment
- External calciume0
- Outcome
- activities of SOD,CAT,APX and PODe0
- Direction
- promotede0
- Qualifier
- during the stress periode1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“External calcium promoted the activities of SOD,CAT,APX and POD”
e1“during the stress period.”
t0“Rice Seedlings”
Claim · model-written summary
External calcium lowered H2O2 and MDA content in stressed leaves.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leaf tissuese0
- Treatment
- External calciume0
- Outcome
- H2O2 and MDA contentse0
- Direction
- reduced considerablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“External calcium promoted the activities of SOD,CAT,APX and POD,but reduced considerably H2O2 and MDA contents and permeability of cell membrane in leaf tissues during the stress period.”
t0“Rice Seedlings”
Claim · model-written summary
External calcium reduced cell-membrane permeability in stressed leaves.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leaf tissuese0
- Treatment
- External calciume0
- Outcome
- permeability of cell membranee0
- Direction
- reduced considerablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“External calcium promoted the activities of SOD,CAT,APX and POD,but reduced considerably H2O2 and MDA contents and permeability of cell membrane in leaf tissues during the stress period.”
t0“Rice Seedlings”
Claim · model-written summary
At 10 mmol/L Ca2+, antioxidant enzyme activities were higher than at 5 mmol/L under nickel stress.
- Taxon
- RiceOryza sativat0
- Treatment
- 10 mmol/L Ca2+e0
- Outcome
- activities of CAT,SOD,POD and APXe0
- Direction
- highere0
- Comparator
- 5 mmol/L Ca2+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activities of CAT,SOD,POD and APX in 10 mmol/L Ca2+-supplemented leaf tissues were higher,and H2O2 and MDA contents were lesser than those in 5 mmol/L Ca2+ under the nickel stress.”
t0“Rice Seedlings”
Claim · model-written summary
At 10 mmol/L Ca2+, H2O2 and MDA contents were lower than at 5 mmol/L under nickel stress.
- Taxon
- RiceOryza sativat0
- Treatment
- 10 mmol/L Ca2+e0
- Outcome
- H2O2 and MDA contentse0
- Direction
- lessere0
- Comparator
- 5 mmol/L Ca2+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activities of CAT,SOD,POD and APX in 10 mmol/L Ca2+-supplemented leaf tissues were higher,and H2O2 and MDA contents were lesser than those in 5 mmol/L Ca2+ under the nickel stress.”
t0“Rice Seedlings”
Claim · model-written summary
The authors suggest calcium tolerance operates through oxygen-species scavenging and membrane integrity.
- Taxon
- riceOryza sativae0
- Treatment
- external calciume0
- Outcome
- tolerance to nickel toxicitye0
- Qualifier
- improving scavenging of active oxygen species and maintaining the integrity of cell membranee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one of the mechanisms that external calcium enhanced the tolerance to nickel toxicity in rice seedlings was mediated by improving scavenging of active oxygen species and maintaining the integrity of cell membrane under nickel stress.”
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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.