Abstract
Nitrogen is a key element in promoting crop growth and development and improving photosynthesis. This study aimed to study the response of two rice genotypes to the restoration of N supply after varying periods of N deficiency. We used the low-nitrogen-tolerant rice Jijing 88 (JJ 88) and the nitrogen-sensitive rice variety Xinong 999 (XN 999) as test materials. The results of this study indicated that, compared to XN 999, JJ 88 has a higher content of the photosynthetic pigments. Photosynthesis in JJ 88 has strong adaptability under low-nitrogen conditions. Upon an increase in the nitrogen supply level, the maximum regeneration rate of ribulose biphosphate (RuBP, Jmax) and the maximum carboxylation rate of RuBP (Vcmax) in JJ 88 showed a relatively large increase. The chlorophyll fluorescence parameters, including the effective quantum yield of photosystem II (ΦPSII), the efficiency of excitation capture by open PSII centers (Fv′/Fm′), photochemical fluorescence quenching (qP), and the electron transfer rate (ETR) decreased slightly, while the non-photochemical fluorescence quenching (NPQ) increased slightly. Under low-nitrogen conditions, low-nitrogen-tolerant rice varieties maintain reasonable growth during the seedling stage. With an increase in the nitrogen supply level, the dry matter accumulation, photosynthetic pigment content, photosynthesis, and electron transfer ability of plants improve, but not to normal nitrogen supply levels. However, compared with XN 999, JJ 88 has a more proactive recovery ability. The research results provide valuable guidance for the breeding of nitrogen-efficient rice varieties and nitrogen fertilizer management.
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Claims 10
Claim · model-written summary
JJ 88 has a higher content of photosynthetic pigments than XN 999.
- Taxon
- Rice
Oryza sativat0 - Material
- JJ 88e2
- Outcome
- content of the photosynthetic pigmentse2
- Direction
- highere2
- Comparator
- XN 999e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e2“compared to XN 999, JJ 88 has a higher content of the photosynthetic pigments”
Claim · model-written summary
Photosynthesis in JJ 88 has strong adaptability under low-nitrogen conditions.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e3
- Treatment
- low-nitrogen conditionse3
- Outcome
- Photosynthesise3
- Qualifier
- strong adaptabilitye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e3“Photosynthesis in JJ 88 has strong adaptability under low-nitrogen conditions”
Claim · model-written summary
With an increase in N supply, Jmax and Vcmax in JJ 88 show a relatively large increase.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e4
- Treatment
- an increase in the nitrogen supply levele4
- Outcome
- the maximum regeneration rate of ribulose biphosphate (RuBP, Jmax) and the maximum carboxylation rate of RuBP (Vcmax)e4
- Direction
- increasee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e4“Upon an increase in the nitrogen supply level, the maximum regeneration rate of ribulose biphosphate (RuBP, Jmax) and the maximum carboxylation rate of RuBP (Vcmax) in JJ 88 showed a relatively large increase”
Claim · model-written summary
With restored N supply, the chlorophyll fluorescence parameters ΦPSII, Fv′/Fm′ and qP decrease slightly.
- Taxon
- RiceOryza sativat0
- Treatment
- restoration of N supplye0
- Outcome
- chlorophyll fluorescence parameterse5
- Direction
- decreasede5
- Qualifier
- the effective quantum yield of photosystem II (ΦPSII), the efficiency of excitation capture by open PSII centers (Fv′/Fm′), photochemical fluorescence quenching (qP)e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e0“the restoration of N supply after varying periods of N deficiency”
e5“The chlorophyll fluorescence parameters, including the effective quantum yield of photosystem II (ΦPSII), the efficiency of excitation capture by open PSII centers (Fv′/Fm′), photochemical fluorescence quenching (qP), and the electron transfer rate (ETR) decreased slightly”
Claim · model-written summary
With restored N supply, the electron transfer rate (ETR) decreases slightly.
- Taxon
- RiceOryza sativat0
- Treatment
- restoration of N supplye0
- Outcome
- electron transfer rate (ETR)e5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e0“the restoration of N supply after varying periods of N deficiency”
e5“The chlorophyll fluorescence parameters, including the effective quantum yield of photosystem II (ΦPSII), the efficiency of excitation capture by open PSII centers (Fv′/Fm′), photochemical fluorescence quenching (qP), and the electron transfer rate (ETR) decreased slightly”
Claim · model-written summary
With restored N supply, the non-photochemical fluorescence quenching (NPQ) increases slightly.
- Taxon
- RiceOryza sativat0
- Treatment
- restoration of N supplye0
- Outcome
- non-photochemical fluorescence quenching (NPQ)e6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e0“the restoration of N supply after varying periods of N deficiency”
e6“the non-photochemical fluorescence quenching (NPQ) increased slightly”
Claim · model-written summary
Under low-nitrogen conditions, low-nitrogen-tolerant rice varieties maintain reasonable growth during the seedling stage.
- Taxon
- RiceOryza sativat0
- Organ / stage
- seedling stagee1
- Treatment
- Under low-nitrogen conditionse1
- Outcome
- reasonable growthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e1“Under low-nitrogen conditions, low-nitrogen-tolerant rice varieties maintain reasonable growth during the seedling stage”
Claim · model-written summary
With an increase in N supply, dry matter accumulation, photosynthetic pigment content and photosynthesis improve, but not to normal N supply levels.
- Taxon
- RiceOryza sativat0
- Treatment
- an increase in the nitrogen supply levele7
- Outcome
- dry matter accumulation, photosynthetic pigment content, photosynthesise7
- Direction
- improvee7
- Qualifier
- but not to normal nitrogen supply levelse7
- Comparator
- normal nitrogen supply levelse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e7“With an increase in the nitrogen supply level, the dry matter accumulation, photosynthetic pigment content, photosynthesis, and electron transfer ability of plants improve, but not to normal nitrogen supply levels”
Claim · model-written summary
With an increase in N supply, the electron transfer ability of plants improves, but not to normal N supply levels.
- Taxon
- RiceOryza sativat0
- Treatment
- an increase in the nitrogen supply levele7
- Outcome
- electron transfer ability of plantse7
- Direction
- improvee7
- Qualifier
- but not to normal nitrogen supply levelse7
- Comparator
- normal nitrogen supply levelse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e7“With an increase in the nitrogen supply level, the dry matter accumulation, photosynthetic pigment content, photosynthesis, and electron transfer ability of plants improve, but not to normal nitrogen supply levels”
Claim · model-written summary
JJ 88 has a more proactive recovery ability than XN 999.
- Taxon
- RiceOryza sativat0
- Material
- JJ 88e1
- Outcome
- recovery abilitye1
- Comparator
- XN 999e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Photosynthesis and Chlorophyll Fluorescence to Nitrogen Changes in Rice”
e1“compared with XN 999, JJ 88 has a more proactive recovery ability”
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