Abstract
Nitrogen (N) availability significantly influences plant metabolism and productivity. The aim of this study was to assess the effects of low N stress and subsequent N supplementation on key enzymes of nitrogen metabolism, nitrogen metabolism-related substances, and chlorophyll a fluorescence kinetic parameters in rice genotypes with different nitrogen utilization efficiencies. We used the Jijing 88 (low-N tolerant) and Xinong 999 (low-N sensitive) as test materials. During the seedling, tillering, and booting stages, the 1/2N and 1/4N treatments were restored to the 1N treatment level. Nine treatments were used in this experiment: CK (1N), A1 (1/2N), A2 (1/2N restored to 1N during the seedling stage), A3 (1/2N restored to 1N during the tillering stage), A4 (1/2N restored to 1N during the booting stage), B1 (1/4N), B2 (1/4N restored to 1N during the seedling stage), B3 (1/4N restored to 1N during the tillering stage), and B4 (1/4N restored to 1N during the booting stage). Key physiological responses, nitrogen compounds, enzymes activities, and chlorophyll a fluorescence kinetics were analyzed. Under low nitrogen conditions, the growth and nitrogen assimilation of rice were inhibited. Compared to XN 999, JJ 88 maintains higher levels of dry matter, nitrate reductase activity (NR), glutamine synthetase activity (GS), glutamate oxaloacetate transaminase activity (GOT), glutamate pyruvate transaminase activity (GPT), as well as nitrate (NO3−) and ammonium (NH4+) nitrogen contents. After N supplementation during the early growth stage, both JJ 88 and XN 999 exhibit recovery capabilities. However, in the late growth stage, JJ 88 demonstrates superior recovery capabilities. In addition to enhancing nitrogen metabolism levels, there is also an increase in the content of osmotic regulation substances such as soluble sugars, free amino acids, and proline, along with responses in chlorophyll fluorescence kinetic parameters. This was primarily manifested in the enhancement of performance index (PIABS, PItotal), and quantum yield (φEO, φRO, ψEO), which maintain photosynthetic performance and electron transport efficiency. The research findings indicated that reducing N supply during the early growth stage and restoring N levels in the later stage are beneficial for the recovery of low-nitrogen-tolerant rice varieties. Therefore, in the context of sustainable agricultural production, the breeding of low-nitrogen-tolerant rice varieties and the optimization of N fertilizer management are crucial.
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Claims 11
Claim · model-written summary
Low nitrogen inhibited rice growth and nitrogen assimilation.
- Taxon
- rice
Oryza sativae0 - Treatment
- low nitrogen conditionse0
- Outcome
- growth and nitrogen assimilatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low nitrogen conditions, the growth and nitrogen assimilation of rice were inhibited.”
Claim · model-written summary
JJ 88 maintained higher dry matter than XN 999.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to XN 999, JJ 88 maintains higher levels of dry matter, nitrate reductase activity (NR), glutamine synthetase activity (GS), glutamate oxaloacetate transaminase activity (GOT), glutamate pyruvate transaminase activity (GPT), as well as nitrate (NO3−) and ammonium (NH4+) nitrogen contents.”
t0“Rice”
Claim · model-written summary
JJ 88 maintained higher NR, GS and GOT activities than XN 999.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e0
- Outcome
- nitrate reductase activity (NR), glutamine synthetase activity (GS), glutamate oxaloacetate transaminase activity (GOT)e0
- Direction
- highere0
- Comparator
- XN 999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to XN 999, JJ 88 maintains higher levels of dry matter, nitrate reductase activity (NR), glutamine synthetase activity (GS), glutamate oxaloacetate transaminase activity (GOT), glutamate pyruvate transaminase activity (GPT), as well as nitrate (NO3−) and ammonium (NH4+) nitrogen contents.”
t0“Rice”
Claim · model-written summary
JJ 88 maintained higher GPT activity than XN 999.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e0
- Outcome
- glutamate pyruvate transaminase activity (GPT)e0
- Direction
- highere0
- Comparator
- XN 999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to XN 999, JJ 88 maintains higher levels of dry matter, nitrate reductase activity (NR), glutamine synthetase activity (GS), glutamate oxaloacetate transaminase activity (GOT), glutamate pyruvate transaminase activity (GPT), as well as nitrate (NO3−) and ammonium (NH4+) nitrogen contents.”
t0“Rice”
Claim · model-written summary
JJ 88 maintained higher nitrate and ammonium contents than XN 999.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e0
- Outcome
- nitrate (NO3−) and ammonium (NH4+) nitrogen contentse0
- Direction
- highere0
- Comparator
- XN 999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to XN 999, JJ 88 maintains higher levels of dry matter, nitrate reductase activity (NR), glutamine synthetase activity (GS), glutamate oxaloacetate transaminase activity (GOT), glutamate pyruvate transaminase activity (GPT), as well as nitrate (NO3−) and ammonium (NH4+) nitrogen contents.”
t0“Rice”
Claim · model-written summary
Both genotypes recovered after early nitrogen supplementation.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88 and XN 999e0
- Treatment
- N supplementation during the early growth stagee0
- Outcome
- recovery capabilitiese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After N supplementation during the early growth stage, both JJ 88 and XN 999 exhibit recovery capabilities.”
t0“Rice”
Claim · model-written summary
JJ 88 recovered better than XN 999 after late nitrogen supplementation.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e0
- Outcome
- recovery capabilitiese0
- Direction
- superiore0
- Comparator
- XN 999e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in the late growth stage, JJ 88 demonstrates superior recovery capabilities.”
e1“After N supplementation during the early growth stage, both JJ 88 and XN 999 exhibit recovery capabilities.”
t0“Rice”
Claim · model-written summary
Nitrogen replenishment increased soluble sugars, free amino acids and proline.
- Taxon
- RiceOryza sativat0
- Outcome
- content of osmotic regulation substances such as soluble sugars, free amino acids, and prolinee0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is also an increase in the content of osmotic regulation substances such as soluble sugars, free amino acids, and proline”
t0“Rice”
Claim · model-written summary
Performance indexes PIABS and PItotal increased.
- Taxon
- RiceOryza sativat0
- Outcome
- performance index (PIABS, PItotal)e0
- Direction
- enhancemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was primarily manifested in the enhancement of performance index (PIABS, PItotal), and quantum yield (φEO, φRO, ψEO), which maintain photosynthetic performance and electron transport efficiency.”
t0“Rice”
Claim · model-written summary
Quantum yield φEO, φRO and ψEO increased.
- Taxon
- RiceOryza sativat0
- Outcome
- quantum yield (φEO, φRO, ψEO)e0
- Direction
- enhancemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was primarily manifested in the enhancement of performance index (PIABS, PItotal), and quantum yield (φEO, φRO, ψEO), which maintain photosynthetic performance and electron transport efficiency.”
t0“Rice”
Claim · model-written summary
Reducing early N and restoring later N benefits recovery of tolerant rice.
- Taxon
- riceOryza sativae0
- Outcome
- reducing N supply during the early growth stage and restoring N levels in the later stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing N supply during the early growth stage and restoring N levels in the later stage are beneficial for the recovery of low-nitrogen-tolerant rice varieties.”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
108 papers in the same direction as this paper · 402 in the opposite direction
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