Abstract
Abstract Nitrogen plays a significant role in influencing various physiological processes in plants, thereby impacting their ability to withstand abiotic stresses. This study used hydroponics to compare the effects of three nitrogen supply levels (1N, 1/2N and 1/4N) on the antioxidant capacity of rice varieties JJ88 (nitrogen efficient) and XN999 (nitrogen inefficient) with different nitrogen use efficiencies. The results show that compared with the XN999 variety, the JJ88 variety has stronger adaptability to low-nitrogen conditions, which is mainly reflected in the relatively small decrease in dry weight and net photosynthetic rate (Pn); In the early stage of low-nitrogen treatment (0–7 d), the $${\mathbf{O}}_{2}^{-}$$ O 2 - production rate, hydrogen peroxide (H 2 O 2 ) and malondialdehyde (MDA) content of JJ88 variety increased relatively slightly, but the superoxide dismutase (SOD), peroxide The activity of enzyme (POD) and catalase (CAT) increased significantly; After low-nitrogen treatment, the ASA–GSH cycle enzyme activity of JJ88 variety was relatively high, and the dehydroascorbate reductase (DHAR) activity after 14 days of low-nitrogen treatment was higher than that of 1N treatment; The content of reduced ascorbic acid (ASA) in non-enzymatic antioxidants was lower than that of 1N treatment after 14 days of low nitrogen treatment; The contents of oxidized dehydroascorbic acid (DHA) and carotenoids (Car) were higher than those of 1N treatment after 21d and 14d of low nitrogen treatment respectively; The contents of reduced glutathione (GSH), oxidized glutathione (GSSG) and proline (Pro) showed a larger upward trend during the entire low-nitrogen treatment period. In summary, the JJ88 rice variety has a strong ability to regulate oxidative stress and osmotic damage under low nitrogen conditions. It can slow down plant damage by regulating antioxidant enzyme activity and antioxidant content. This provides a basis for achieving nitrogen reduction and efficiency improvement in rice and the breeding of nitrogen-efficient varieties.
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Claims 10
Claim · model-written summary
Under low nitrogen, rice variety JJ88 showed a relatively smaller decrease in dry weight and net photosynthetic rate than XN999.
- Taxon
- rice
Oryza sativat0 - Material
- JJ88 varietye0
- Treatment
- low-nitrogen conditionse0
- Outcome
- dry weight and net photosynthetic rate (Pn)e0
- Direction
- relatively small decreasee0
- Comparator
- XN999 varietye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the XN999 variety, the JJ88 variety has stronger adaptability to low-nitrogen conditions, which is mainly reflected in the relatively small decrease in dry weight and net photosynthetic rate (Pn)”
t0“rice varieties”
Claim · model-written summary
In the early stage of low-nitrogen treatment, hydrogen peroxide and malondialdehyde content of JJ88 increased relatively slightly.
- Taxon
- riceOryza sativat0
- Material
- JJ88 varietye0
- Outcome
- hydrogen peroxide (H 2 O 2 ) and malondialdehyde (MDA) contente0
- Direction
- increased relatively slightlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen peroxide (H 2 O 2 ) and malondialdehyde (MDA) content of JJ88 variety increased relatively slightly”
t0“rice varieties”
Claim · model-written summary
In the early stage of low-nitrogen treatment, the activities of SOD, POD and CAT in JJ88 increased significantly.
- Taxon
- riceOryza sativat0
- Outcome
- superoxide dismutase (SOD), peroxide The activity of enzyme (POD) and catalase (CAT)e0
- Direction
- increased significantlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“superoxide dismutase (SOD), peroxide The activity of enzyme (POD) and catalase (CAT) increased significantly”
t0“rice varieties”
Claim · model-written summary
After low-nitrogen treatment, ASA-GSH cycle enzyme activity of JJ88 was relatively high.
- Taxon
- riceOryza sativat0
- Material
- JJ88 varietye0
- Outcome
- ASA–GSH cycle enzyme activitye0
- Direction
- relatively highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After low-nitrogen treatment, the ASA–GSH cycle enzyme activity of JJ88 variety was relatively high”
t0“rice varieties”
Claim · model-written summary
DHAR activity of JJ88 after 14 days of low-nitrogen treatment was higher than under 1N treatment.
- Taxon
- riceOryza sativat0
- Treatment
- low-nitrogen treatmente0
- Outcome
- dehydroascorbate reductase (DHAR) activitye0
- Direction
- highere0
- Qualifier
- after 14 dayse0
- Comparator
- 1N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dehydroascorbate reductase (DHAR) activity after 14 days of low-nitrogen treatment was higher than that of 1N treatment”
t0“rice varieties”
Claim · model-written summary
Reduced ascorbic acid content was lower than under 1N treatment after 14 days of low nitrogen treatment.
- Taxon
- riceOryza sativat0
- Treatment
- low nitrogen treatmente0
- Outcome
- content of reduced ascorbic acid (ASA)e0
- Direction
- lowere0
- Qualifier
- after 14 dayse0
- Comparator
- 1N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of reduced ascorbic acid (ASA) in non-enzymatic antioxidants was lower than that of 1N treatment after 14 days of low nitrogen treatment”
t0“rice varieties”
Claim · model-written summary
Oxidized dehydroascorbic acid content was higher than under 1N treatment after 21 days of low nitrogen treatment.
- Taxon
- riceOryza sativat0
- Treatment
- low nitrogen treatmente0
- Outcome
- oxidized dehydroascorbic acid (DHA)e0
- Direction
- highere0
- Qualifier
- 21de0
- Comparator
- 1N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of oxidized dehydroascorbic acid (DHA) and carotenoids (Car) were higher than those of 1N treatment after 21d and 14d of low nitrogen treatment respectively”
t0“rice varieties”
Claim · model-written summary
Carotenoid content was higher than under 1N treatment after 14 days of low nitrogen treatment.
- Taxon
- riceOryza sativat0
- Treatment
- low nitrogen treatmente0
- Outcome
- carotenoids (Car)e0
- Direction
- highere0
- Qualifier
- 14de0
- Comparator
- 1N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of oxidized dehydroascorbic acid (DHA) and carotenoids (Car) were higher than those of 1N treatment after 21d and 14d of low nitrogen treatment respectively”
t0“rice varieties”
Claim · model-written summary
GSH, GSSG and proline contents showed a larger upward trend during the entire low-nitrogen treatment period.
- Taxon
- riceOryza sativat0
- Outcome
- reduced glutathione (GSH), oxidized glutathione (GSSG) and proline (Pro)e0
- Direction
- larger upward trende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of reduced glutathione (GSH), oxidized glutathione (GSSG) and proline (Pro) showed a larger upward trend during the entire low-nitrogen treatment period”
t0“rice varieties”
Claim · model-written summary
The authors conclude that rice variety JJ88 has a strong ability to regulate oxidative stress and osmotic damage under low nitrogen conditions.
- Taxon
- riceOryza sativae0
- Material
- JJ88e0
- Outcome
- ability to regulate oxidative stress and osmotic damagee0
- Setting
- low nitrogen conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the JJ88 rice variety has a strong ability to regulate oxidative stress and osmotic damage under low nitrogen conditions”