Abstract
Abstract Two chilling‐tolerant genotypes, that is, weedy rice WR 03‐45 and cultivated rice L ijiangxintuanheigu and two chilling‐sensitive genotypes, that is, weedy rice WR 03‐26 and cultivated rice Xiuzinuo were used in this study to investigate the effects of exogenous abscisic acid ( ABA ) on protection against chilling damage as well as on changes in physiological features. The results showed that under chilling stress the increased levels of superoxide radical ( ), hydrogen peroxide ( H 2 O 2 ) and malondialdehyde ( MDA ) in WR 03‐45 and L ijiangxintuanheigu were lower than those in WR 03‐26 and X iuzinuo. Activities of antioxidant enzymes (superoxide dismutase ( SOD ), catalase ( CAT ), ascorbate peroxidase ( APX ), glutathione reductase ( GR )) and non‐enzymatic antioxidants (ascorbate acid ( A s A ) and reduced glutathione ( GSH )) were enhanced in WR 03‐45 and L ijiangxintuanheigu, whereas they were decreased significantly in WR 03‐26 and X iuzinuo. Application of exogenous ABA reduced the chilling damage in the four genotypes. The pre‐treatment with ABA decreased the levels of , H 2 O 2 and MDA caused by chilling stress in the four genotypes through increasing the activities of SOD , CAT , APX , GR and the contents of A s A and GSH in the four genotypes under chilling stress. Moreover, pre‐treatment with F luridone, the ABA biosynthesis inhibitor, prohibited the effects of ABA through enhancing the oxidative damages and suppressing the antioxidant defence systems under chilling stress. The results indicate the mechanism for rice with chilling tolerance is to enhance the capacity of antioxidant defence systems under chilling stress. Furthermore, ABA plays important roles in the tolerance of rice against chilling stress for it could induce the capacity of whole antioxidant defence systems including enzymatic and non‐enzymatic constitutions under chilling stress.
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Claims 11
Claim · model-written summary
Chilling-tolerant rice genotypes had lower increases in oxidative markers than sensitive genotypes.
- Taxon
- Rice
Oryza sativat0 - Material
- WR 03‐45 and L ijiangxintuanheigue0
- Outcome
- levels of superoxide radical ( ), hydrogen peroxide ( H 2 O 2 ) and malondialdehyde ( MDA )e0
- Direction
- lowere0
- Comparator
- WR 03‐26 and X iuzinuoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased levels of superoxide radical ( ), hydrogen peroxide ( H 2 O 2 ) and malondialdehyde ( MDA ) in WR 03‐45 and L ijiangxintuanheigu were lower than those in WR 03‐26 and X iuzinuo.”
t0“Rice”
Claim · model-written summary
Antioxidant enzymes increased in tolerant genotypes under chilling.
- Taxon
- RiceOryza sativat0
- Material
- WR 03‐45 and L ijiangxintuanheigue0
- Outcome
- Activities of antioxidant enzymese0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activities of antioxidant enzymes (superoxide dismutase ( SOD ), catalase ( CAT ), ascorbate peroxidase ( APX ), glutathione reductase ( GR )) and non‐enzymatic antioxidants (ascorbate acid ( A s A ) and reduced glutathione ( GSH )) were enhanced in WR 03‐45 and L ijiangxintuanheigu, whereas they were decreased significantly in WR 03‐26 and X iuzinuo.”
t0“Rice”
Claim · model-written summary
Nonenzymatic antioxidants increased in tolerant genotypes under chilling.
- Taxon
- RiceOryza sativat0
- Material
- WR 03‐45 and L ijiangxintuanheigue0
- Outcome
- non‐enzymatic antioxidantse0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non‐enzymatic antioxidants (ascorbate acid ( A s A ) and reduced glutathione ( GSH )) were enhanced in WR 03‐45 and L ijiangxintuanheigu”
t0“Rice”
Claim · model-written summary
Antioxidant enzyme activities decreased significantly in sensitive genotypes.
- Taxon
- RiceOryza sativat0
- Material
- WR 03‐26 and X iuzinuoe0
- Outcome
- Activities of antioxidant enzymese0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activities of antioxidant enzymes (superoxide dismutase ( SOD ), catalase ( CAT ), ascorbate peroxidase ( APX ), glutathione reductase ( GR )) and non‐enzymatic antioxidants (ascorbate acid ( A s A ) and reduced glutathione ( GSH )) were enhanced in WR 03‐45 and L ijiangxintuanheigu, whereas they were decreased significantly in WR 03‐26 and X iuzinuo.”
t0“Rice”
Claim · model-written summary
Nonenzymatic antioxidants decreased significantly in sensitive genotypes.
- Taxon
- RiceOryza sativat0
- Material
- WR 03‐26 and X iuzinuoe0
- Outcome
- non‐enzymatic antioxidantse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non‐enzymatic antioxidants (ascorbate acid ( A s A ) and reduced glutathione ( GSH )) were enhanced in WR 03‐45 and L ijiangxintuanheigu, whereas they were decreased significantly in WR 03‐26 and X iuzinuo.”
t0“Rice”
Claim · model-written summary
Exogenous ABA reduced chilling damage in four rice genotypes.
- Taxon
- RiceOryza sativat0
- Treatment
- exogenous ABAe0
- Outcome
- chilling damagee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of exogenous ABA reduced the chilling damage in the four genotypes.”
t0“Rice”
Claim · model-written summary
ABA pretreatment decreased chilling-induced oxidative marker levels in four genotypes.
- Taxon
- RiceOryza sativat0
- Treatment
- pre‐treatment with ABAe0
- Outcome
- levels of , H 2 O 2 and MDAe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pre‐treatment with ABA decreased the levels of , H 2 O 2 and MDA caused by chilling stress in the four genotypes”
t0“Rice”
Claim · model-written summary
ABA pretreatment increased antioxidant enzyme activities in four genotypes.
- Taxon
- RiceOryza sativat0
- Treatment
- pre‐treatment with ABAe0
- Outcome
- activities of SOD , CAT , APX , GRe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pre‐treatment with ABA decreased the levels of , H 2 O 2 and MDA caused by chilling stress in the four genotypes through increasing the activities of SOD , CAT , APX , GR and the contents of A s A and GSH in the four genotypes under chilling stress.”
t0“Rice”
Claim · model-written summary
ABA pretreatment increased ascorbate and glutathione contents in four genotypes.
- Taxon
- RiceOryza sativat0
- Treatment
- pre‐treatment with ABAe1
- Outcome
- contents of A s A and GSHe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the activities of SOD , CAT , APX , GR and the contents of A s A and GSH in the four genotypes under chilling stress”
e1“pre‐treatment with ABA”
t0“Rice”
Claim · model-written summary
Fluridone pretreatment increased oxidative damage under chilling.
- Taxon
- RiceOryza sativat0
- Treatment
- pre‐treatment with F luridonee0
- Outcome
- oxidative damagese0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pre‐treatment with F luridone, the ABA biosynthesis inhibitor, prohibited the effects of ABA through enhancing the oxidative damages and suppressing the antioxidant defence systems under chilling stress.”
t0“Rice”
Claim · model-written summary
Fluridone pretreatment suppressed antioxidant defenses under chilling.
- Taxon
- RiceOryza sativat0
- Treatment
- pre‐treatment with F luridonee0
- Outcome
- antioxidant defence systemse0
- Direction
- suppressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pre‐treatment with F luridone, the ABA biosynthesis inhibitor, prohibited the effects of ABA through enhancing the oxidative damages and suppressing the antioxidant defence systems under chilling stress.”
t0“Rice”
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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.