Abstract
Abstract Rice (Oryza sativa, L.) is most sensitive to salinity injury as a seedling. Information describing the effects of salinity on the seedling rice plant is limited. Therefore, the current study was conducted to determine if salinity injury to rice seedlings is the result of toxic levels of chloride, or if a change in osmotic potential interferes with the plant's ability to absorb water and nutrients. Rice was grown in controlled environmental conditions through the seedling growth stage. In hydroponic culture with a 50% Hoagland's solution, the rice was exposed to osmotic tensions of 0, 50, 100, 200, 400, 800, or 1,600 kPa imposed by either CaCl2 or polyethylene glycol (PEG). The rice was grown for 1 wk following imposition of the osmotic treatments. Visual ratings were then obtained and plants were harvested for dry matter determination and Cl‐ concentration. Shoot weights were lowered for PEG treatments compared to CaCl2. Root weights differed little between CaCl2 and PEG treatments. Root weights decreased with increasing osmotic tension whether decreased by CaCl2 or PEG. Salinity related damage to leaves and roots was worse for PEG than for CaCl2 treatments. Not surprisingly, uptake of Cl‐ tended to increase with increasing rates of CaCl2, but not with PEG. These data suggest that rice sensitivity to salinity is the result of changes in the osmotic potential gradient rather than to chloride toxicity. Notes Approved for publication by the Director of the Arkansas Agricultural Experiment Station. Partial funding provided by the Arkansas Rice Research and Promotion Board.
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Claims 6
Claim · model-written summary
Rice seedling shoot weights were lower under PEG treatments than under CaCl2 treatments.
- Taxon
- rice
Oryza sativat0 - Treatment
- PEG treatmentse0
- Outcome
- Shoot weightse0
- Direction
- lowerede0
- Comparator
- CaCl2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seedlings”
e0“Shoot weights were lowered for PEG treatments compared to CaCl2”
Claim · model-written summary
Root weights differed little between CaCl2 and PEG treatments.
- Taxon
- riceOryza sativat0
- Treatment
- PEG treatmentse0
- Outcome
- Root weightse0
- Direction
- differed littlee0
- Comparator
- CaCl2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seedlings”
e0“Root weights differed little between CaCl2 and PEG treatments”
Claim · model-written summary
Root weights decreased with increasing osmotic tension, whether imposed by CaCl2 or PEG.
- Taxon
- riceOryza sativat0
- Treatment
- osmotic tensione0
- Outcome
- Root weightse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seedlings”
e0“Root weights decreased with increasing osmotic tension whether decreased by CaCl2 or PEG”
Claim · model-written summary
Salinity-related damage to leaves and roots was worse under PEG than under CaCl2 treatments.
- Taxon
- riceOryza sativat0
- Treatment
- PEGe0
- Outcome
- damage to leaves and rootse0
- Direction
- worsee0
- Comparator
- CaCl2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seedlings”
e0“Salinity related damage to leaves and roots was worse for PEG than for CaCl2 treatments”
Claim · model-written summary
Chloride uptake tended to increase with increasing rates of CaCl2 but not with PEG.
- Taxon
- riceOryza sativat0
- Treatment
- increasing rates of CaCl2e0
- Outcome
- uptake of Cl‐e0
- Direction
- tended to increasee0
- Comparator
- PEGe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seedlings”
e0“uptake of Cl‐ tended to increase with increasing rates of CaCl2, but not with PEG”
Claim · model-written summary
Rice sensitivity to salinity results from changes in the osmotic potential gradient rather than from chloride toxicity.
- Taxon
- riceOryza sativae0
- Outcome
- sensitivity to salinitye0
- Qualifier
- changes in the osmotic potential gradient rather than to chloride toxicitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice sensitivity to salinity is the result of changes in the osmotic potential gradient rather than to chloride toxicity”
The same questions in other papers
poly(ethylene glycol) · pest · Oryza sativa (rice)Positive and negative results
2 in the opposite direction
- positive
- positive
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.