Abstract
The effects of nitrogen (N) nutrition on growth, N uptake and leaf osmotic potential of rice plants ( Oryza sativa L. ev. IR 36) during simulated water stress were determined. Twenty‐one‐day‐old seedlings in high (28.6 × 10 −4 M ) and low (7.14 × 10 4 M ) N levels were exposed to decreased nutrient solution water potentials by addition of polyethylene glycol 6000. The roots were separated from the solution by a semi‐permeable membrane. Nutrient solution water potential was −0.6 × 10 5 Pa and was lowered stepwise to −1 × 10 5 , −2 × 10 5 , −4 × 10 5 and −6 × 10 5 Pa at 2‐day intervals. Plant height, leaf area and shoot dry weight of high and low nitrogen plants were reduced by lower osmotic potentials of the root medium. Osmotic stress caused greater shoot growth reduction in high N than in low N plants. Stressed and unstressed plants in 7.14 × 10 4 M N had more root dry matter than the corresponding plants in 28.6 × 10 4 M N. Dawn leaf water potential of stressed plants was 1 × 10 5 to 5.5 × 10 5 Pa lower than nutrient solution water potential. Nitrogen‐deficient water‐stressed plants, however, maintained higher dawn leaf water potential than high nitrogen water‐stressed plants. It is suggested that this was due to higher root‐to‐shoot ratios of N deficient plants. The osmotic potentials of leaves at full turgor for control plants were about 1.3 × 10 5 Pa higher in 7.14 × 10 −4 M than in 28.6 × 10 −4 M N and osmotic adjustment of 2.6 × 10 5 and 4.3 × 10 5 Pa was obtained in low and high N plants, respectively. The nitrogen status of plants, therefore, affected the ability of the rice plant to adjust osmotically during water stress. Plant water stress decreased transpiration and total N content in shoots of both N treatments. Reduced shoot growth as a result of water stress caused the decrease in amount of water transpired. Transpiration and N uptake were significantly correlated. Our results show that nitrogen content is reduced in water‐stressed plants by the integrated effects of plant water stress per se on accumulation of dry matter and transpiring leaf area as well as the often cited changes in soil physical properties of a drying root medium.
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Claims 12
Claim · model-written summary
Lower root medium osmotic potential reduced height, leaf area, and shoot dry weight at both nitrogen levels.
- Taxon
- rice
Oryza sativae1 - Treatment
- lower osmotic potentials of the root mediume0
- Outcome
- Plant height, leaf area and shoot dry weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height, leaf area and shoot dry weight of high and low nitrogen plants were reduced by lower osmotic potentials of the root medium”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Osmotic stress caused greater shoot growth reduction under high than low nitrogen.
- Taxon
- riceOryza sativae1
- Treatment
- Osmotic stresse0
- Outcome
- shoot growth reductione0
- Direction
- greatere0
- Qualifier
- high Ne0
- Comparator
- low N plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic stress caused greater shoot growth reduction in high N than in low N plants”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Low nitrogen plants had more root dry matter than high nitrogen plants.
- Taxon
- riceOryza sativae1
- Treatment
- 7.14 × 10 4 M Ne0
- Outcome
- root dry mattere0
- Direction
- moree0
- Comparator
- 28.6 × 10 4 M Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stressed and unstressed plants in 7.14 × 10 4 M N had more root dry matter than the corresponding plants in 28.6 × 10 4 M N”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Stressed plant dawn leaf water potential was lower than solution water potential by 1 × 10 5 to 5.5 × 10 5 Pa.
- Taxon
- riceOryza sativae1
- Outcome
- Dawn leaf water potentiale0
- Direction
- lowere0
- Value
- 1 × 10 5 to 5.5 × 10 5 Pae0
- Comparator
- nutrient solution water potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dawn leaf water potential of stressed plants was 1 × 10 5 to 5.5 × 10 5 Pa lower than nutrient solution water potential”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Nitrogen deficient stressed plants maintained higher dawn leaf water potential.
- Taxon
- riceOryza sativae1
- Treatment
- Nitrogen‐deficient water‐stressede0
- Outcome
- dawn leaf water potentiale0
- Direction
- highere0
- Comparator
- high nitrogen water‐stressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen‐deficient water‐stressed plants, however, maintained higher dawn leaf water potential than high nitrogen water‐stressed plants”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Control leaf osmotic potential at full turgor was about 1.3 × 10 5 Pa higher under low nitrogen.
- Taxon
- riceOryza sativae1
- Treatment
- 7.14 × 10 −4 Me0
- Outcome
- osmotic potentials of leaves at full turgore0
- Direction
- highere0
- Value
- 1.3 × 10 5 Pae0
- Comparator
- 28.6 × 10 −4 M Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The osmotic potentials of leaves at full turgor for control plants were about 1.3 × 10 5 Pa higher in 7.14 × 10 −4 M than in 28.6 × 10 −4 M N”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Low nitrogen plants achieved 2.6 × 10 5 Pa osmotic adjustment.
- Taxon
- riceOryza sativae1
- Outcome
- osmotic adjustmente0
- Value
- 2.6 × 10 5e0
- Qualifier
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“osmotic adjustment of 2.6 × 10 5 and 4.3 × 10 5 Pa was obtained in low and high N plants, respectively”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
High nitrogen plants achieved 4.3 × 10 5 Pa osmotic adjustment.
- Taxon
- riceOryza sativae1
- Outcome
- osmotic adjustmente0
- Value
- 4.3 × 10 5 Pae0
- Qualifier
- high Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“osmotic adjustment of 2.6 × 10 5 and 4.3 × 10 5 Pa was obtained in low and high N plants, respectively”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Water stress decreased transpiration and shoot nitrogen content under both nitrogen treatments.
- Taxon
- riceOryza sativae1
- Treatment
- Plant water stresse0
- Outcome
- transpiration and total N content in shootse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant water stress decreased transpiration and total N content in shoots of both N treatments”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
Transpiration and nitrogen uptake were significantly correlated.
- Taxon
- riceOryza sativae1
- Treatment
- Plant water stresse2
- Outcome
- N uptakee0
- Qualifier
- Transpiratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transpiration and N uptake were significantly correlated”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
e2“Plant water stress”
Claim · model-written summary
Reduced shoot growth from water stress caused lower transpiration.
- Taxon
- riceOryza sativae1
- Outcome
- amount of water transpirede0
- Qualifier
- Reduced shoot growth as a result of water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced shoot growth as a result of water stress caused the decrease in amount of water transpired”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
Claim · model-written summary
The authors attribute lower nitrogen content under water stress to reduced dry matter accumulation and transpiring leaf area.
- Taxon
- riceOryza sativae1
- Outcome
- nitrogen contente0
- Qualifier
- accumulation of dry matter and transpiring leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen content is reduced in water‐stressed plants by the integrated effects of plant water stress per se on accumulation of dry matter and transpiring leaf area”
e1“rice plants ( Oryza sativa L. ev. IR 36)”
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