Abstract
The present investigation was undertaken to clarify the relationship between nitrogen content in leaf blades and stomatal aperture at different growth stages, by using rice plants with different nitrogen content. There were two plots prepared. One was a control, the other was a plot with additional nitrogen applied to soil several days before stomatal measurement (Table 1). The results obtained are as follows. For the plants, received additional application of ammonium sulfate, there was higher content of nitrogen in leaf blades regardless of leaf position on the stem and of growth stage (Table 2). On fine days the stomatal aperture was larger in higher nitrogen plot compared with that of the control especially from the morning until the aperture reached to the maximum of the day. After the stomata started to close in the afternoon the difference of stomatal aperture became very small or negligible due to more considerable extent of stomatal closure in higher nitrogen plot (Fig. 1). On the contrary, on cloudy days accompanied with lesser evaporation, the difference of the stomatal aperture between the two plots could be found from the morning to the evening even though it became smaller in the afternoon compared with that in the morning (Fig. 2). In addition, the larger difference of the aperture between two plots was found in upper leaves compared with lower leaves at all growth stages independent of weather condition (Fig. 3 and 4). A high positive correlation between nitrogen content and stomatal aperture was clarified in leaves on the different position of the stem at different growth stages (Fig. 5 and 7). In Fig. 5 and 7, examined in detail, it was found out that the stomatal aperture of lower leaves was smaller compared with that of upper leaves in the almost same nitrogen content and that the stomatal aperture of rice plants after heading stage was also smaller even in the same leaf position compared with that before heading stage (Fig. 6). It is assumed from these results that the difference of stomatal aperture between rice plants with higher and lower nitrogen content appears only in the case with sufficient water content of leaf blades, but that it cannot be found in leaves under water stress. Furthermore, it is also suggested that the increase of stomatal aperture owing to higher nitrogen content has much bearing on the increase of photosynthetic rate in leaf blades, considering high positive correlation between stomatal aperture and photosynthetic rate in rice plants.
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Claims 11
Claim · model-written summary
Additional ammonium sulfate application raised nitrogen content in rice leaf blades relative to control.
- Taxon
- rice plants
Oryza sativae0 - Organ / stage
- leaf bladese2
- Treatment
- additional application of ammonium sulfatee2
- Outcome
- content of nitrogen in leaf bladese2
- Direction
- highere2
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“One was a control, the other was a plot with additional nitrogen applied to soil several days before stomatal measurement”
e2“For the plants, received additional application of ammonium sulfate, there was higher content of nitrogen in leaf blades regardless of leaf position on the stem and of growth stage”
Claim · model-written summary
On fine days stomatal aperture was larger in the higher-nitrogen rice plot than in the control.
- Taxon
- rice plantsOryza sativae0
- Treatment
- higher nitrogen plote2
- Outcome
- stomatal aperturee2
- Direction
- largere2
- Comparator
- controle2
- Setting
- fine dayse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“One was a control, the other was a plot with additional nitrogen applied to soil several days before stomatal measurement”
e2“On fine days the stomatal aperture was larger in higher nitrogen plot compared with that of the control especially from the morning until the aperture reached to the maximum of the day”
Claim · model-written summary
In the afternoon, after stomata began to close, the difference in stomatal aperture between higher-nitrogen and control rice became very small or negligible.
- Taxon
- rice plantsOryza sativae0
- Treatment
- higher nitrogen plote1
- Outcome
- difference of stomatal aperturee1
- Direction
- became very small or negligiblee1
- Qualifier
- After the stomata started to close in the afternoone1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“After the stomata started to close in the afternoon the difference of stomatal aperture became very small or negligible due to more considerable extent of stomatal closure in higher nitrogen plot”
Claim · model-written summary
On cloudy days the difference in stomatal aperture between the two rice plots was found from morning to evening.
- Taxon
- rice plantsOryza sativae0
- Treatment
- additional nitrogene1
- Outcome
- difference of the stomatal aperture between the two plotse2
- Qualifier
- from the morning to the eveninge2
- Comparator
- controle1
- Setting
- cloudy dayse2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“One was a control, the other was a plot with additional nitrogen applied to soil several days before stomatal measurement”
e2“On the contrary, on cloudy days accompanied with lesser evaporation, the difference of the stomatal aperture between the two plots could be found from the morning to the evening”
Claim · model-written summary
Stomatal aperture difference between high- and low-nitrogen plots was larger in upper leaves than in lower leaves at all growth stages and in all weather.
- Taxon
- rice plantsOryza sativae0
- Organ / stage
- upper leavese1
- Outcome
- difference of the aperture between two plotse1
- Direction
- largere1
- Qualifier
- independent of weather conditione1
- Comparator
- lower leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“the larger difference of the aperture between two plots was found in upper leaves compared with lower leaves at all growth stages independent of weather condition”
Claim · model-written summary
Leaf nitrogen content and stomatal aperture were highly positively correlated across leaf positions and growth stages in rice.
- Taxon
- rice plantsOryza sativae0
- Organ / stage
- leaves on the different position of the steme1
- Compound
- nitrogene1
- Outcome
- stomatal aperturee1
- Direction
- high positive correlatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“A high positive correlation between nitrogen content and stomatal aperture was clarified in leaves on the different position of the stem at different growth stages”
Claim · model-written summary
Lower leaves had smaller stomatal apertures than upper leaves at about the same nitrogen content.
- Taxon
- rice plantsOryza sativae0
- Organ / stage
- lower leavese1
- Outcome
- stomatal aperturee1
- Direction
- smallere1
- Qualifier
- in the almost same nitrogen contente1
- Comparator
- upper leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“the stomatal aperture of lower leaves was smaller compared with that of upper leaves in the almost same nitrogen content”
Claim · model-written summary
Rice stomatal aperture after heading was smaller than before heading, even at the same leaf position.
- Taxon
- rice plantsOryza sativae0
- Organ / stage
- after heading stagee1
- Outcome
- stomatal aperturee1
- Direction
- smallere1
- Qualifier
- even in the same leaf positione1
- Comparator
- before heading stagee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“the stomatal aperture of rice plants after heading stage was also smaller even in the same leaf position compared with that before heading stage”
Claim · model-written summary
The nitrogen-related difference in stomatal aperture appears only with sufficient leaf water and cannot be found under water stress.
- Taxon
- rice plantsOryza sativae0
- Treatment
- water stresse1
- Outcome
- difference of stomatal aperturee1
- Direction
- appears onlye1
- Qualifier
- with sufficient water content of leaf bladese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“the difference of stomatal aperture between rice plants with higher and lower nitrogen content appears only in the case with sufficient water content of leaf blades, but that it cannot be found in leaves under water stress”
Claim · model-written summary
Higher-nitrogen-induced increase in stomatal aperture is suggested to contribute to increased photosynthetic rate in rice leaf blades.
- Taxon
- rice plantsOryza sativae0
- Outcome
- photosynthetic ratee1
- Qualifier
- increase of stomatal aperture owing to higher nitrogen contente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“increase of stomatal aperture owing to higher nitrogen content has much bearing on the increase of photosynthetic rate in leaf blades”
Claim · model-written summary
Stomatal aperture and photosynthetic rate are highly positively correlated in rice leaf blades.
- Taxon
- rice plantsOryza sativae0
- Organ / stage
- leaf bladese1
- Outcome
- photosynthetic ratee2
- Direction
- high positive correlatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by using rice plants with different nitrogen content”
e1“increase of stomatal aperture owing to higher nitrogen content has much bearing on the increase of photosynthetic rate in leaf blades”
e2“high positive correlation between stomatal aperture and photosynthetic rate in rice plants”
The same questions in other papers
nitrogen · physiology: gas exchange · Oryza sativa (rice)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
4 papers more in this group
See all 8 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.