Abstract
Chilling associated oxidative damage that enhanced the production of reactive oxygen species (ROS), slow down metabolism and modify membranes resulting in lipid peroxidation. A marked increase in the level of H 2O2 was estimated in alfalfa leaves after dark chilling treatment and as a consequence, oxidation damage due to H2O 2 accumulation could cause lipid peroxidation of membrane and result in a significant increase in malondialdehyde (MDA) content. After recovery period the MDA content decreased significantly due to the increase of phenolic compounds, which suppress lipid peroxidation. Also, the redox properties of α-tocopherol play an important role in adsorbing and neutralizing free radicals and provide some forms of antioxidant protection. Activity of superoxide dismutase (SOD) increased straight away the dark chilling stress, whereas catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) activities were slightly increased after chilling treatment. During the recovery period activities of CAT, APX and GR increased significantly, which restrict the recycling of active oxygen species associated with chilling stress. The results indicated that cold treatment may have initially caused injury, thereafter during the recovery period leaves coordinated and enhanced the capacity of the antioxidative system, thus diminishing the potential for active oxygen species.
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Claims 9
Claim · model-written summary
Dark chilling raised H2O2 in alfalfa leaves.
- Taxon
- alfalfa
Medicago sativae0 - Organ / stage
- leavese0
- Treatment
- dark chilling treatmente0
- Outcome
- level of H 2O2e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A marked increase in the level of H 2O2 was estimated in alfalfa leaves after dark chilling treatment”
Claim · model-written summary
MDA content rose significantly following H2O2 accumulation.
- Taxon
- medicago sativaMedicago sativat0
- Compound
- H2O 2e0
- Outcome
- malondialdehyde (MDA) contente0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O 2 accumulation could cause lipid peroxidation of membrane and result in a significant increase in malondialdehyde (MDA) content”
t0“medicago sativa”
Claim · model-written summary
MDA content decreased significantly during recovery.
- Taxon
- medicago sativaMedicago sativat0
- Outcome
- MDA contente0
- Direction
- decreasede0
- Qualifier
- After recovery periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After recovery period the MDA content decreased significantly due to the increase of phenolic compounds”
t0“medicago sativa”
Claim · model-written summary
Phenolic compounds increased during recovery.
- Taxon
- medicago sativaMedicago sativat0
- Outcome
- phenolic compoundse0
- Direction
- increasee0
- Qualifier
- After recovery periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After recovery period the MDA content decreased significantly due to the increase of phenolic compounds”
t0“medicago sativa”
Claim · model-written summary
Authors attribute lower lipid peroxidation during recovery to phenolic compounds.
- Taxon
- medicago sativaMedicago sativat0
- Compound
- phenolic compoundse0
- Outcome
- lipid peroxidatione0
- Direction
- suppresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of phenolic compounds, which suppress lipid peroxidation”
t0“medicago sativa”
Claim · model-written summary
Authors attribute antioxidant protection to α-tocopherol redox activity.
- Taxon
- medicago sativaMedicago sativat0
- Compound
- α-tocopherole0
- Outcome
- antioxidant protectione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“redox properties of α-tocopherol play an important role in adsorbing and neutralizing free radicals and provide some forms of antioxidant protection”
t0“medicago sativa”
Claim · model-written summary
SOD activity increased immediately after dark chilling.
- Taxon
- medicago sativaMedicago sativat0
- Treatment
- dark chilling stresse0
- Gene
- superoxide dismutase (SOD)e0
- Outcome
- Activity of superoxide dismutase (SOD)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activity of superoxide dismutase (SOD) increased straight away the dark chilling stress”
t0“medicago sativa”
Claim · model-written summary
CAT, APX and GR activities rose slightly after chilling.
- Taxon
- medicago sativaMedicago sativat0
- Treatment
- chilling treatmente0
- Outcome
- catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) activities were slightly increased after chilling treatment”
t0“medicago sativa”
Claim · model-written summary
CAT, APX and GR activities increased significantly during recovery.
- Taxon
- medicago sativaMedicago sativat0
- Outcome
- activities of CAT, APX and GRe0
- Direction
- increasede0
- Qualifier
- During the recovery periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the recovery period activities of CAT, APX and GR increased significantly”
t0“medicago sativa”
The same questions in other papers
light · physiology: oxidative · Medicago sativa (alfalfa)Positive and negative results
2 in the opposite direction
- positive
- positive
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.