Abstract
A hydroponic experiment was conducted to investigate the effects of exogenous 24-epibrassinolide(EBR)on the mitochondria antioxidant system and cellular ultrastructure in seedlings roots of cucumber(Cucumis sativus L.‘Zhongnong 6’)under hypoxic stress. Under the stress,the superoxide anion()production rate,contents of hydrogen peroxide(H2O2)and malondialdehyde(MDA) were significantly enhanced,while the root activity was decreased,and the root tip cells were damaged. Compared with the control,the activities of SOD,POD and CAT were induced and were higher at 3 d, but significantly decreased at 6 d by hypoxic stress. However,EBR treatment could keep higher activities of SOD,POD and CAT for a longer time,reduce the generation of ,H2O2 and MDA contents,increasethe root activity,and release the damage of root tip cells. The results suggested that exogenous EBR could play a positive role in regulating the mitochondria antioxidant system and keeping cellular ultrastructure of cucumber seedling roots,and alleviate the damage of hypoxic stress.
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Claims 8
Claim · model-written summary
Hypoxic stress significantly enhanced superoxide anion production and hydrogen peroxide and malondialdehyde contents.
- Taxon
- cucumber
Cucumis sativust0 - Organ / stage
- seedling rootst0
- Treatment
- stresse0
- Outcome
- superoxide anion()production rate,contents of hydrogen peroxide(H2O2)and malondialdehyde(MDA)e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the stress,the superoxide anion()production rate,contents of hydrogen peroxide(H2O2)and malondialdehyde(MDA) were significantly enhanced”
t0“cucumber seedling roots”
Claim · model-written summary
Hypoxic stress decreased root activity and damaged root tip cells.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- root tip cellse0
- Treatment
- hypoxic stresst0
- Outcome
- root activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while the root activity was decreased,and the root tip cells were damaged.”
t0“cucumber seedling roots under hypoxic stress”
Claim · model-written summary
Hypoxic stress raised SOD, POD and CAT activity at 3 days relative to control.
- Taxon
- cucumberCucumis sativust0
- Treatment
- hypoxic stresst0
- Outcome
- activities of SOD,POD and CATe0
- Direction
- highere0
- Qualifier
- 3 de0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the control,the activities of SOD,POD and CAT were induced and were higher at 3 d”
t0“cucumber seedling roots under hypoxic stress”
Claim · model-written summary
Hypoxic stress significantly reduced SOD, POD and CAT activity at 6 days.
- Taxon
- cucumberCucumis sativust0
- Treatment
- hypoxic stresse0
- Outcome
- activities of SOD,POD and CATe1
- Direction
- decreasede0
- Qualifier
- 6 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but significantly decreased at 6 d by hypoxic stress.”
e1“the activities of SOD,POD and CAT were induced”
t0“cucumber seedling roots”
Claim · model-written summary
EBR treatment maintained higher SOD, POD and CAT activities for longer.
- Taxon
- cucumberCucumis sativust0
- Treatment
- EBR treatmente0
- Outcome
- activities of SOD,POD and CATe0
- Direction
- highere0
- Qualifier
- for a longer timee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EBR treatment could keep higher activities of SOD,POD and CAT for a longer time”
t0“cucumber seedling roots”
Claim · model-written summary
EBR reduced superoxide anion generation and hydrogen peroxide and malondialdehyde contents.
- Taxon
- cucumberCucumis sativust0
- Treatment
- EBRe1
- Outcome
- generation of ,H2O2 and MDA contentse0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduce the generation of ,H2O2 and MDA contents”
e1“However,EBR treatment”
t0“cucumber seedling roots”
Claim · model-written summary
EBR increased root activity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- EBR treatmente1
- Outcome
- root activitye0
- Direction
- increasethee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasethe root activity”
e1“EBR treatment”
t0“cucumber seedling roots”
Claim · model-written summary
EBR alleviated root tip cell damage.
- Taxon
- cucumberCucumis sativust0
- Treatment
- EBR treatmente1
- Outcome
- damage of root tip cellse0
- Direction
- releasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“release the damage of root tip cells”
e1“EBR treatment”
t0“cucumber seedling roots”
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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.