Abstract
Abstract The development of the uptake capacity for different cations and anions was studied in ageing potato tuber discs. Na+, Rb+ and Fe2+ showed no lag period; leucine, 2–3 h; K+, HPO4 2‐, SO4 2‐, 9–10 h; Cl‐, 35–39 h lag. When uptake was carried out with potato discs previously aged in water the lag period disappeared. Cycloheximide (5 10‐2 M), added to potato discs before ageing, strongly inhibited the development of the uptake capacity for SO4 2‐, K+, HPO4 2‐, Cl‐, leucine, and to a lesser extent that of Rb and Fe2+, while it stimulated that of Na+ The same effect was produced by CH on aged potato discs. Methionine, which was shown to inhibit sulfate uptake, inhibited also Cl‐ and leucine uptake in aged discs, leaving unaffected that of the other ions tested. Ion uptake by potato tuber appears to be supported by multiple transport systems, whose turnover is different for different groups of ions. These show also different sensibility to the action of cycloheximide and methionine.
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Claims 11
Claim · model-written summary
Na+, Rb+ and Fe2+ uptake showed no lag.
- Outcome
- Na+, Rb+ and Fe2+ showed no lag periode0
Not reportedTaxon
Verbatim
e0“Na+, Rb+ and Fe2+ showed no lag period”
Claim · model-written summary
Leucine uptake lagged 2–3 h.
Not reportedTaxon
Verbatim
e0“leucine, 2–3 h”
Claim · model-written summary
K+, HPO4 2‐ and SO4 2‐ uptake lagged 9–10 h.
Not reportedTaxon
Verbatim
e0“K+, HPO4 2‐, SO4 2‐, 9–10 h”
Claim · model-written summary
Cl‐ uptake lagged 35–39 h.
Not reportedTaxon
Verbatim
e0“Cl‐, 35–39 h lag”
Claim · model-written summary
Prior aging in water eliminated the uptake lag.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- previously aged in watere0
- Outcome
- lag periode0
- Direction
- disappearede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When uptake was carried out with potato discs previously aged in water the lag period disappeared”
Claim · model-written summary
Cycloheximide inhibited uptake capacity development for SO4 2‐, K+ and HPO4 2‐.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Cycloheximide (5 10‐2 M)e0
- Outcome
- uptake capacity for SO4 2‐, K+, HPO4 2‐e0
- Direction
- strongly inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cycloheximide (5 10‐2 M), added to potato discs before ageing, strongly inhibited the development of the uptake capacity for SO4 2‐, K+, HPO4 2‐, Cl‐, leucine”
Claim · model-written summary
Cycloheximide strongly inhibited uptake development for Cl‐ and leucine.
Not reportedTaxonTreatmentComparator
Verbatim
e0“strongly inhibited the development of the uptake capacity for SO4 2‐, K+, HPO4 2‐, Cl‐, leucine”
Claim · model-written summary
Cycloheximide less strongly inhibited Rb and Fe2+ uptake capacity.
- Outcome
- Rb and Fe2+e0
Not reportedTaxonTreatmentComparatorDirection
Verbatim
e0“to a lesser extent that of Rb and Fe2+”
Claim · model-written summary
Cycloheximide stimulated Na+ uptake capacity.
Not reportedTaxonTreatmentComparator
Verbatim
e0“while it stimulated that of Na+”
Claim · model-written summary
Methionine inhibited sulfate, Cl‐ and leucine uptake in aged discs.
Not reportedTaxonComparator
Verbatim
e0“Methionine, which was shown to inhibit sulfate uptake, inhibited also Cl‐ and leucine uptake in aged discs”
Claim · model-written summary
Methionine left uptake of the other tested ions unaffected.
Not reportedTaxonTreatmentComparator
Verbatim
e0“leaving unaffected that of the other ions tested”