Abstract
Abstract Accumulation and translocation of sulphate in excised maize roots, submerged in rising saline concentrations, were investigated. It was shown that the accumulation of sulphate is not depressed by concentrations from 1 to 50 mM of NaCl or KCl, it is weakly increased by concentrations of the same salts 100 mM and it is gradually lowered by concentrations from 1 to 100 mM of MgCl2. On the contrary the translocation is gradually inhibited by rising concentrations of NaCl, KCl and MgCl2. A 100 mM NaCl concentration considerably loweres the translocation in 24 hours, but does not affect accumulation. Accumulation and translocation are strongly depressed by the inhibitors of oxydative phosphorylation (2,4 DNP or CCCP) and by 200 mM NaCl, KCl or MgCl2 concentrations. It is concluded that accumulation and translocation are active processes as they are reduced by 2,4 DNP or CCCP; that the small increase in accumulation observed by 100 mM NaCl or KCl concentration is due probably to the discharging action of cations exercited on the membranes of root cells and that only the second step of ion translocation, i.e. ion secretion in xylem, is sensible to the presence of high saline concentrations of NaCl or KCl in the outer medium.
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Claims 11
Claim · model-written summary
Sulphate accumulation in excised maize roots was not depressed by 1 to 50 mM NaCl or KCl.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of sulphate is not depressed by concentrations from 1 to 50 mM of NaCl or KCl”
t0“maize”
Claim · model-written summary
Sulphate accumulation in excised maize roots was weakly increased by 100 mM NaCl or KCl.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of sulphate is not depressed by concentrations from 1 to 50 mM of NaCl or KCl, it is weakly increased by concentrations of the same salts 100 mM”
t0“maize”
Claim · model-written summary
Sulphate accumulation in excised maize roots was gradually lowered by 1 to 100 mM MgCl2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of sulphate is not depressed by concentrations from 1 to 50 mM of NaCl or KCl, it is weakly increased by concentrations of the same salts 100 mM and it is gradually lowered by concentrations from 1 to 100 mM of MgCl2”
t0“maize”
Claim · model-written summary
Sulphate translocation in excised maize roots was gradually inhibited by rising concentrations of NaCl, KCl and MgCl2.
- Treatment
- rising concentrations of NaCl, KCl and MgCl2e0
- Outcome
- translocatione0
- Direction
- gradually inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the translocation is gradually inhibited by rising concentrations of NaCl, KCl and MgCl2”
t0“maize”
Claim · model-written summary
100 mM NaCl considerably lowered sulphate translocation in excised maize roots within 24 hours.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 100 mM NaCl concentration considerably loweres the translocation in 24 hours, but does not affect accumulation”
t0“maize”
Claim · model-written summary
100 mM NaCl did not affect sulphate accumulation in excised maize roots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 100 mM NaCl concentration considerably loweres the translocation in 24 hours, but does not affect accumulation”
t0“maize”
Claim · model-written summary
Sulphate accumulation and translocation were strongly depressed by the oxidative phosphorylation inhibitors 2,4 DNP or CCCP.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation and translocation are strongly depressed by the inhibitors of oxydative phosphorylation (2,4 DNP or CCCP)”
t0“maize”
Claim · model-written summary
Sulphate accumulation and translocation were strongly depressed by 200 mM NaCl, KCl or MgCl2.
- Treatment
- 200 mM NaCl, KCl or MgCl2e0
- Outcome
- Accumulation and translocatione0
- Direction
- strongly depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation and translocation are strongly depressed by the inhibitors of oxydative phosphorylation (2,4 DNP or CCCP) and by 200 mM NaCl, KCl or MgCl2 concentrations”
t0“maize”
Claim · model-written summary
The authors conclude that sulphate accumulation and translocation are active processes because 2,4 DNP or CCCP reduce them.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation and translocation are active processes as they are reduced by 2,4 DNP or CCCP”
t0“maize”
Claim · model-written summary
The authors attribute, probably, the small increase in accumulation at 100 mM NaCl or KCl to a discharging action of cations on root cell membranes.
- Treatment
- 100 mM NaCl or KCle0
- Outcome
- small increase in accumulatione0
- Qualifier
- discharging action of cations exercited on the membranes of root cellse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the small increase in accumulation observed by 100 mM NaCl or KCl concentration is due probably to the discharging action of cations exercited on the membranes of root cells”
t0“maize”
Claim · model-written summary
The authors conclude that only the second step of ion translocation, ion secretion in the xylem, is sensitive to high NaCl or KCl concentrations in the outer medium.
- Treatment
- high saline concentrations of NaCl or KCle0
- Outcome
- second step of ion translocatione0
- Qualifier
- ion secretion in xyleme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the second step of ion translocation, i.e. ion secretion in xylem, is sensible to the presence of high saline concentrations of NaCl or KCl in the outer medium”
t0“maize”
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