Abstract
To identify the effect of nitrogen (N) nutrition on the dynamic photosynthesis of rice plants, a pot experiment was conducted under two N conditions. The leaf N and chlorophyll levels, as well as steady-state photosynthesis, were significantly increased under high N. After the transition from saturating to low light levels, decreases in the induction state (IS%) of leaf photosynthesis (A) and stomatal conductance (gs) were more severe under low than under high N supply. After the transition from low to flecked irradiance, the times to 90% of maximum A (T90%A) were significantly longer under low than under high N supply. Under flecked irradiance, the maximum A under saturating light (Amax-fleck) and the steady-state A under low light (Amin-fleck) were both lower than those under uniform irradiance (Asat and Ainitial). Under high N supply, Amax-fleck was 14.12% lower than Asat, while it was 22.80% lower under low N supply. The higher IS%, shorter T90%A, and the lower depression of Amax-fleck from Asat under high N supply led to a less carbon loss compared with under a low N supply. Therefore, we concluded that N can improve the rapid response of photosynthesis to changing irradiance.
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Claims 8
Claim · model-written summary
High nitrogen significantly increased leaf nitrogen, chlorophyll and steady-state photosynthesis.
- Taxon
- rice
Oryza sativat0 - Treatment
- high Ne0
- Outcome
- leaf N and chlorophyll levels, as well as steady-state photosynthesise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf N and chlorophyll levels, as well as steady-state photosynthesis, were significantly increased under high N.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
After saturating-to-low-light transitions, declines in photosynthetic induction state and stomatal conductance were more severe with low nitrogen.
- Taxon
- riceOryza sativat0
- Treatment
- lowe0
- Outcome
- induction state (IS%) of leaf photosynthesis (A) and stomatal conductance (gs)e0
- Direction
- decreasese0
- Qualifier
- After the transition from saturating to low light levelse0
- Comparator
- high N supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the transition from saturating to low light levels, decreases in the induction state (IS%) of leaf photosynthesis (A) and stomatal conductance (gs) were more severe under low than under high N supply.”
t0“rice”
Claim · model-written summary
Time to 90% maximum photosynthesis after low-to-flecked light transitions was significantly longer under low nitrogen.
- Taxon
- riceOryza sativat0
- Treatment
- lowe0
- Outcome
- times to 90% of maximum A (T90%A)e0
- Direction
- longere0
- Qualifier
- After the transition from low to flecked irradiancee0
- Comparator
- high N supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the transition from low to flecked irradiance, the times to 90% of maximum A (T90%A) were significantly longer under low than under high N supply.”
t0“rice”
Claim · model-written summary
Flecked irradiance lowered maximum saturating-light and steady-state low-light photosynthesis relative to uniform irradiance.
- Taxon
- riceOryza sativat0
- Treatment
- flecked irradiancee0
- Outcome
- maximum A under saturating light (Amax-fleck) and the steady-state A under low light (Amin-fleck)e0
- Direction
- lowere0
- Comparator
- uniform irradiancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under flecked irradiance, the maximum A under saturating light (Amax-fleck) and the steady-state A under low light (Amin-fleck) were both lower than those under uniform irradiance (Asat and Ainitial).”
t0“rice”
Claim · model-written summary
Under high nitrogen Amax-fleck was 14.12% below Asat.
- Taxon
- riceOryza sativat0
- Treatment
- high N supplye0
- Outcome
- Amax-flecke0
- Direction
- lowere0
- Value
- 14.12%e0
- Comparator
- Asate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high N supply, Amax-fleck was 14.12% lower than Asat, while it was 22.80% lower under low N supply.”
t0“rice”
Claim · model-written summary
Under low nitrogen Amax-fleck was 22.80% below Asat.
- Taxon
- riceOryza sativat0
- Treatment
- low N supplye0
- Outcome
- Amax-flecke0
- Direction
- lowere0
- Value
- 22.80%e0
- Comparator
- Asate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high N supply, Amax-fleck was 14.12% lower than Asat, while it was 22.80% lower under low N supply.”
t0“rice”
Claim · model-written summary
High nitrogen caused less carbon loss, attributed to higher induction state, shorter induction time and less depression of maximum photosynthesis.
- Taxon
- riceOryza sativat0
- Treatment
- high N supplye0
- Outcome
- carbon losse0
- Direction
- lesse0
- Qualifier
- higher IS%, shorter T90%A, and the lower depression of Amax-fleck from Asate0
- Comparator
- low N supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher IS%, shorter T90%A, and the lower depression of Amax-fleck from Asat under high N supply led to a less carbon loss compared with under a low N supply.”
t0“rice”
Claim · model-written summary
The authors conclude nitrogen can improve rapid photosynthetic responses to changing irradiance.
- Taxon
- riceOryza sativat0
- Treatment
- Ne0
- Outcome
- rapid response of photosynthesis to changing irradiancee0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore, we concluded that N can improve the rapid response of photosynthesis to changing irradiance.”
t0“rice”
The same questions in other papers
nitrogen · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
80 papers in the same direction as this paper · 13 in the opposite direction · 3 reporting no difference from an alternative
- negative
- positive
- negative
93 papers more in this group
See all 97 papers →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.