Abstract
Abstract Aluminum (Al) causes programmed cell death (PCD) in plants. Our previous studies have confirmed that nitric oxide (NO) inhibits Al-induced PCD in the root tips of peanut. However, the mechanism by which NO inhibits Al-induced PCD is unclear. Here the effects of NO on mitochondrial reactive oxygen species (ROS), malondialdehyde (MDA), activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX), expression of alternative oxidase ( AhAOX ) and cytochrome oxidase ( AhCOX ) were investigated in peanut ( Arachis hypogaea L.) root tips treated with Al. The results showed that Al stress induced rapid accumulation of H 2 O 2 and MDA and increased the ratio of SOD/APX. The up-regulation of AhAOX and AhCOX expressions was not enough to inhibit PCD occurrence. Sodium nitroprusside (SNP, a NO donor) decreased the ratio of SOD/APX and eliminated excess H 2 O 2 and MDA, thereby inhibiting Al-induced PCD in the root tips of peanut. The expression of AhAOX and AhCOX was significantly enhanced in Al-induced PCD treated with SNP. But cPTIO (a NO specific scavenger) supply had the opposite effect. Taken together, these results suggested that lipid peroxidation induced by higher levels of H 2 O 2 was an important cause of Al-induced PCD. NO-mediated inhibition of Al-induced PCD was related to a significant elimination of H 2 O 2 accumulation by decreasing the ratio of SOD/APX and up-regulating the expression of AhAOX and AhCOX .
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Claims 3
Claim · model-written summary
Aluminum stress rapidly increased H 2 O 2 and MDA accumulation in peanut root tips.
- Taxon
- peanut
Arachis hypogaeae1 - Organ / stage
- root tipse1
- Treatment
- Al stresse0
- Outcome
- accumulation of H 2 O 2 and MDAe0
- Direction
- rapid accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al stress induced rapid accumulation of H 2 O 2 and MDA”
e1“in peanut ( Arachis hypogaea L.) root tips treated with Al”
Claim · model-written summary
Aluminum stress increased the SOD/APX ratio in peanut root tips.
- Taxon
- peanutArachis hypogaeae1
- Organ / stage
- root tipse1
- Treatment
- Al stresse2
- Outcome
- ratio of SOD/APXe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the ratio of SOD/APX”
e1“in peanut ( Arachis hypogaea L.) root tips treated with Al”
e2“Al stress induced rapid accumulation of H 2 O 2 and MDA and increased the ratio of SOD/APX”
Claim · model-written summary
SNP inhibited aluminum-induced programmed cell death in peanut root tips.
- Taxon
- peanutArachis hypogaeae0
- Organ / stage
- root tipse0
- Treatment
- Sodium nitroprussidee1
- Outcome
- Al-induced PCDe0
- Direction
- inhibitinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thereby inhibiting Al-induced PCD in the root tips of peanut”
e1“Sodium nitroprusside (SNP, a NO donor) decreased the ratio of SOD/APX and eliminated excess H 2 O 2 and MDA”
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- negative
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- positive
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heavy metal · physiology: antioxidant enzymes · Arachis hypogaea (peanut)Results agree
2 papers in the same direction as this paper
- negative
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heavy metal · physiology: oxidative · Arachis hypogaea (peanut)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.