Abstract
The aim of the present work was to study the mechanism of the silicon-mediated antioxidant system in roots of rice grown under excess manganese(Mn) stress and Mn tolerance regulated by silicon(Si).Two rice varieties that differ in Mn tolerance were cultured in nutrient solution to study the effects of Si(1.5 mmol · L-1) on antioxidant systems of rice roots under excess Mn stress(2 mmol · L-1).For the Mn-sensitive cultivar(XXY),excess Mn significantly increased the activities of superoxide dismutase(SOD),the concentrations of ascorbate(AsA) and non-protein thiols(NPT),while it significantly decreased the activities of catalase(CAT) and ascorbate peroxidase(APX) and the concentrations of glutathione(GSH),thus leading to accumulation of high levels of malondialdehyde(MDA) in root tissues and destruction of plasma membrane integrity.However,excess Mn significantly increased the concentrations of GSH and AsA,but significantly decreased the activities of CAT and the concentrations of NPT,thus leading to accumulation of high level of MDA in the Mn-tolerant cultivar(ZLY).The addition of Si significantly decreased the concentrations of MDA and H2O2 in Mn-stressed root tissues,thereby mitigating the damage.Under excess Mn stress,application of silicon enhances the antioxidant activities of rice roots,and reduces lipid peroxidation and damage to the integrity of the apical membrane,thereby enhancing rice resistance to manganese toxicity.This alleviative effect is more pronounced in Mn-sensitive rice(XXY) than in Mn-tolerant rice(ZLY).
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Claims 11
Claim · model-written summary
Excess manganese increased SOD activity, AsA and NPT in sensitive XXY rice.
- Taxon
- rice
Oryza sativat0 - Material
- XXYe0
- Treatment
- excess Mne0
- Outcome
- activities of superoxide dismutase(SOD),the concentrations of ascorbate(AsA) and non-protein thiols(NPT)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the Mn-sensitive cultivar(XXY),excess Mn significantly increased the activities of superoxide dismutase(SOD),the concentrations of ascorbate(AsA) and non-protein thiols(NPT)”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Excess manganese decreased CAT and APX activity and GSH concentration in sensitive XXY rice.
- Taxon
- riceOryza sativat0
- Material
- XXYe0
- Treatment
- excess Mne0
- Outcome
- activities of catalase(CAT) and ascorbate peroxidase(APX) and the concentrations of glutathione(GSH)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the Mn-sensitive cultivar(XXY),excess Mn significantly increased the activities of superoxide dismutase(SOD),the concentrations of ascorbate(AsA) and non-protein thiols(NPT),while it significantly decreased the activities of catalase(CAT) and ascorbate peroxidase(APX) and the concentrations of glutathione(GSH)”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Excess manganese accumulated MDA and damaged plasma membrane integrity in sensitive XXY rice roots.
- Taxon
- riceOryza sativat0
- Outcome
- accumulation of high levels of malondialdehyde(MDA) in root tissues and destruction of plasma membrane integritye0
- Direction
- high levelse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thus leading to accumulation of high levels of malondialdehyde(MDA) in root tissues and destruction of plasma membrane integrity.”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Excess manganese increased GSH and AsA concentrations in tolerant ZLY rice.
- Taxon
- riceOryza sativat0
- Material
- ZLYe0
- Treatment
- excess Mne0
- Outcome
- concentrations of GSH and AsAe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However,excess Mn significantly increased the concentrations of GSH and AsA,but significantly decreased the activities of CAT and the concentrations of NPT,thus leading to accumulation of high level of MDA in the Mn-tolerant cultivar(ZLY).”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Excess manganese decreased CAT activity and NPT concentration in tolerant ZLY rice.
- Taxon
- riceOryza sativat0
- Material
- ZLYe0
- Treatment
- excess Mne0
- Outcome
- activities of CAT and the concentrations of NPTe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However,excess Mn significantly increased the concentrations of GSH and AsA,but significantly decreased the activities of CAT and the concentrations of NPT,thus leading to accumulation of high level of MDA in the Mn-tolerant cultivar(ZLY).”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Excess manganese caused high MDA accumulation in tolerant ZLY rice.
- Taxon
- riceOryza sativat0
- Material
- ZLYe0
- Outcome
- accumulation of high level of MDAe0
- Direction
- high levele0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thus leading to accumulation of high level of MDA in the Mn-tolerant cultivar(ZLY).”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Silicon decreased MDA and H2O2 concentrations in manganese stressed rice roots.
- Taxon
- riceOryza sativat0
- Organ / stage
- root tissuese0
- Treatment
- addition of Sie0
- Outcome
- concentrations of MDA and H2O2e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of Si significantly decreased the concentrations of MDA and H2O2 in Mn-stressed root tissues,thereby mitigating the damage.”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Silicon enhanced antioxidant activity in manganese stressed rice roots.
- Taxon
- riceOryza sativae0
- Treatment
- application of silicone0
- Outcome
- antioxidant activities of rice rootse0
- Direction
- enhancese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under excess Mn stress,application of silicon enhances the antioxidant activities of rice roots,and reduces lipid peroxidation and damage to the integrity of the apical membrane,thereby enhancing rice resistance to manganese toxicity.”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Silicon reduced lipid peroxidation and apical membrane damage in manganese stressed rice roots.
- Taxon
- riceOryza sativae0
- Treatment
- application of silicone0
- Outcome
- lipid peroxidation and damage to the integrity of the apical membranee0
- Direction
- reducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under excess Mn stress,application of silicon enhances the antioxidant activities of rice roots,and reduces lipid peroxidation and damage to the integrity of the apical membrane,thereby enhancing rice resistance to manganese toxicity.”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
Silicon enhanced rice resistance to manganese toxicity.
- Taxon
- riceOryza sativae0
- Treatment
- application of silicone0
- Outcome
- rice resistance to manganese toxicitye0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under excess Mn stress,application of silicon enhances the antioxidant activities of rice roots,and reduces lipid peroxidation and damage to the integrity of the apical membrane,thereby enhancing rice resistance to manganese toxicity.”
t0“rice(Oryza sativa L.)”
Claim · model-written summary
The silicon alleviation was stronger in sensitive XXY than tolerant ZLY rice.
- Taxon
- riceOryza sativae0
- Material
- XXYe0
- Outcome
- alleviative effecte0
- Direction
- more pronouncede0
- Comparator
- ZLYe0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This alleviative effect is more pronounced in Mn-sensitive rice(XXY) than in Mn-tolerant rice(ZLY).”
t0“rice(Oryza sativa L.)”
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