Abstract
Seedlings of Ricinus communis L. were cultivated in quartz sand and supplied with media which contained either different concentrations of nitrate or ammonium nitrogen and were treated with a low salt stress. The concentration of ABA was determined in tissues and in xylem and phloem saps. Between 41 and 51 day after sowing, abscisic acid (ABA) flows between roots and shoots were modelled. Long-distance transport of ABA was not stimulated under conditions of nitrate deficiency (0.2 mol m−3). However, when ammonium was given as the only N source (1.0 mol m−3), ABA transport in both xylem and phloem was increased significantly. Mild salt stress (40 mol m−3 NaCl) increased ABA transport in nitrate-fed plants, but not in ammonium-fed plants. The leaf conductance was lowered by salt treatment with both nitrogen sources, but it was always lower in ammonium-fed compared to nitrate-fed plants. A negative correlation of leaf conductance to ABA levels in leaves or flow in xylem was found only in comparison of ammonium-fed to nitrate-fed plants.
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Claims 7
Claim · model-written summary
Nitrate deficiency did not stimulate long-distance ABA transport.
- Taxon
- Ricinus communis L.
Ricinus communist0 - Treatment
- nitrate deficiency (0.2 mol m−3)e0
- Outcome
- Long-distance transport of ABAe0
- Direction
- not stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-distance transport of ABA was not stimulated under conditions of nitrate deficiency (0.2 mol m−3)”
t0“Ricinus communis L.”
Claim · model-written summary
Ammonium as sole N source significantly increased ABA transport in xylem and phloem.
- Taxon
- Ricinus communis L.Ricinus communist0
- Treatment
- ammonium was given as the only N source (1.0 mol m−3)e0
- Outcome
- ABA transport in both xylem and phloeme0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when ammonium was given as the only N source (1.0 mol m−3), ABA transport in both xylem and phloem was increased significantly”
t0“Ricinus communis L.”
Claim · model-written summary
Mild salt stress increased ABA transport in nitrate-fed plants.
- Taxon
- Ricinus communis L.Ricinus communist0
- Treatment
- Mild salt stress (40 mol m−3 NaCl)e0
- Outcome
- ABA transporte0
- Direction
- increasede0
- Qualifier
- nitrate-fed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild salt stress (40 mol m−3 NaCl) increased ABA transport in nitrate-fed plants, but not in ammonium-fed plants”
t0“Ricinus communis L.”
Claim · model-written summary
Mild salt stress did not increase ABA transport in ammonium-fed plants.
- Taxon
- Ricinus communis L.Ricinus communist0
- Treatment
- Mild salt stress (40 mol m−3 NaCl)e0
- Outcome
- ABA transporte0
- Direction
- note0
- Qualifier
- ammonium-fed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild salt stress (40 mol m−3 NaCl) increased ABA transport in nitrate-fed plants, but not in ammonium-fed plants”
t0“Ricinus communis L.”
Claim · model-written summary
Salt lowered leaf conductance under both nitrogen sources.
- Taxon
- Ricinus communis L.Ricinus communist0
- Treatment
- salt treatmente0
- Outcome
- leaf conductancee0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf conductance was lowered by salt treatment with both nitrogen sources”
t0“Ricinus communis L.”
Claim · model-written summary
Leaf conductance was lower with ammonium than nitrate.
- Taxon
- Ricinus communis L.Ricinus communist0
- Treatment
- ammonium-fede0
- Outcome
- leaf conductancee0
- Direction
- lowere0
- Comparator
- nitrate-fed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf conductance was lowered by salt treatment with both nitrogen sources, but it was always lower in ammonium-fed compared to nitrate-fed plants”
t0“Ricinus communis L.”
Claim · model-written summary
Leaf conductance was negatively correlated with leaf ABA or xylem ABA flow only across nitrogen source groups.
- Taxon
- Ricinus communis L.Ricinus communist0
- Compound
- ABAe0
- Outcome
- leaf conductancee0
- Direction
- negative correlatione0
- Comparator
- nitrate-fed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative correlation of leaf conductance to ABA levels in leaves or flow in xylem was found only in comparison of ammonium-fed to nitrate-fed plants”
t0“Ricinus communis L.”
The same questions in other papers
sodium chloride · molecular: metabolites · Ricinus communis (castor bean)Positive and negative results
1 in the opposite direction
- positive
salinity · molecular: metabolites · Ricinus communis (castor bean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
nitrogen · molecular: metabolites · Ricinus communis (castor bean)Results agree
2 papers in the same direction as this paper
- 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.