Abstract
The impact of inorganic ions on sucrose fluxes in the cotyledons and on the pathway of phloem loading was studied in Ricinus communis L. seedlings. The cotyledons were incubated in defined solutions which contained either potassium, sodium, magnesium or calcium as chloride salts, or the sodium salts of sulphate or phosphate. Sucrose uptake from the medium into the cotyledons was only slightly affected by the salts. Sucrose efflux to the medium was increased by phosphate and sulphate and to a lesser extent by sodium and potassium. Phloem loading from the apoplasm and the symplasm was analysed by addition of labelled sucrose to the medium, determination of the specific radioactivity of sucrose in sieve‐tube exudate and quantification of export into the seedling axis. Potassium and sodium stimulated the apoplasmic route of phloem loading of sucrose, mostly at the expense of loading from cotyledon sucrose pools. In contrast, sulphate and phosphate strongly inhibited the apoplasmic route whereas the (small) symplasmic flux from the cotyledon sucrose pools was less affected. Magnesium ions inhibited phloem loading by both pathways. The potential of ions in modulating the pathways of sucrose export in day to day operation of plants is discussed.
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Claims 5
Claim · model-written summary
Potassium and sodium stimulated the apoplasmic route of phloem loading of sucrose, mostly at the expense of loading from cotyledon sucrose pools.
- Taxon
- Ricinus communis
Ricinus communise0 - Treatment
- potassium, sodiume2
- Outcome
- apoplasmic route of phloem loading of sucrosee1
- Direction
- stimulatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impact of inorganic ions on sucrose fluxes in the cotyledons and on the pathway of phloem loading was studied in Ricinus communis L. seedlings”
e1“Potassium and sodium stimulated the apoplasmic route of phloem loading of sucrose, mostly at the expense of loading from cotyledon sucrose pools”
e2“The cotyledons were incubated in defined solutions which contained either potassium, sodium, magnesium or calcium as chloride salts”
Claim · model-written summary
Sulphate and phosphate strongly inhibited the apoplasmic route of phloem loading of sucrose.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- sulphate and phosphatee3
- Outcome
- apoplasmic routee3
- Direction
- inhibitede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impact of inorganic ions on sucrose fluxes in the cotyledons and on the pathway of phloem loading was studied in Ricinus communis L. seedlings”
e3“In contrast, sulphate and phosphate strongly inhibited the apoplasmic route whereas the (small) symplasmic flux from the cotyledon sucrose pools was less affected”
Claim · model-written summary
Phosphate and sulphate increased sucrose efflux to the medium.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- phosphate and sulphatee4
- Outcome
- Sucrose efflux to the mediume4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impact of inorganic ions on sucrose fluxes in the cotyledons and on the pathway of phloem loading was studied in Ricinus communis L. seedlings”
e4“Sucrose efflux to the medium was increased by phosphate and sulphate and to a lesser extent by sodium and potassium”
Claim · model-written summary
Magnesium ions inhibited phloem loading of sucrose by both the apoplasmic and symplasmic pathways.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- Magnesium ionse5
- Outcome
- phloem loading by both pathwayse5
- Direction
- inhibitede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impact of inorganic ions on sucrose fluxes in the cotyledons and on the pathway of phloem loading was studied in Ricinus communis L. seedlings”
e5“Magnesium ions inhibited phloem loading by both pathways”
Claim · model-written summary
Salts only slightly affected sucrose uptake from the medium into the cotyledons.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- the saltse6
- Outcome
- Sucrose uptake from the medium into the cotyledonse6
- Direction
- only slightly affectede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impact of inorganic ions on sucrose fluxes in the cotyledons and on the pathway of phloem loading was studied in Ricinus communis L. seedlings”
e6“Sucrose uptake from the medium into the cotyledons was only slightly affected by the salts”
The same questions in other papers
salinity · nutrient: content · Ricinus communis (castor bean)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.