Abstract
Net uptake of sulphate by the roots, and its transport to the shoot was inhibited in intact tobacco plants by 1 h exposure of its roots to 0.1 or 1.0 mM GSH. The relative amount of sulphate taken up that was transported to the shoot was not affected by this treatment. Apparently, sulphate uptake, but not xylem loading of sulphate, was inhibited by GSH. Similar results were obtained when L-cysteine was used instead of GSH. As L-cysteine, mediated inhibition of sulphate, net uptake was counteracted by exposure of the roots to BSO, GSH synthesis seems to be required for inhibition of sulphate uptake by L-cysteine. However, exposure to 0.1 or 1.0mM GSH did not result In an enhanced GSH level in roots or shoots. Also the cysteine contents remained unchanged. Small changes in metabolically active pools of GSH or cysteine seem to be responsible for the inhibition of sulphate uptake and its transport to the shoot. Flap-feeding of GSH to a mature leaf resulted in an inhibition of net uptake of sulphate by the roots and its transport to the shoot. These findings support the hypothesis that GSH produced in the leaves acts as a signal to control sulphur nutrition of plants.
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Claims 9
Claim · model-written summary
Root GSH exposure inhibited sulphate uptake in tobacco.
- Taxon
- tobacco plants
Nicotiana tabacume0 - Treatment
- 1 h exposure of its roots to 0.1 or 1.0 mM GSHe0
- Outcome
- Net uptake of sulphate by the rootse0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net uptake of sulphate by the roots, and its transport to the shoot was inhibited in intact tobacco plants by 1 h exposure of its roots to 0.1 or 1.0 mM GSH”
Claim · model-written summary
Root GSH exposure inhibited sulphate transport to the shoot in tobacco.
- Taxon
- tobacco plantsNicotiana tabacume0
- Treatment
- 1 h exposure of its roots to 0.1 or 1.0 mM GSHe0
- Outcome
- transport to the shoote0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net uptake of sulphate by the roots, and its transport to the shoot was inhibited in intact tobacco plants by 1 h exposure of its roots to 0.1 or 1.0 mM GSH”
Claim · model-written summary
Root GSH exposure did not change the relative share of absorbed sulphate transported to shoots.
- Taxon
- tobacco plantsNicotiana tabacume1
- Treatment
- 1 h exposure of its roots to 0.1 or 1.0 mM GSHe1
- Outcome
- relative amount of sulphate taken up that was transported to the shoote0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative amount of sulphate taken up that was transported to the shoot was not affected by this treatment”
e1“intact tobacco plants by 1 h exposure of its roots to 0.1 or 1.0 mM GSH”
Claim · model-written summary
L-cysteine exposure likewise inhibited tobacco sulphate uptake and transport.
- Taxon
- tobacco plantsNicotiana tabacume1
- Treatment
- L-cysteinee0
- Outcome
- Net uptake of sulphate by the roots, and its transport to the shoote1
- Comparator
- GSHe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar results were obtained when L-cysteine was used instead of GSH”
e1“Net uptake of sulphate by the roots, and its transport to the shoot was inhibited in intact tobacco plants”
Claim · model-written summary
BSO counteracted L-cysteine-mediated inhibition of sulphate uptake.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- exposure of the roots to BSOe0
- Outcome
- sulphate, net uptakee0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-cysteine, mediated inhibition of sulphate, net uptake was counteracted by exposure of the roots to BSO”
t0“tobacco plants”
Claim · model-written summary
GSH root exposure did not raise GSH levels in roots or shoots.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- exposure to 0.1 or 1.0mM GSHe0
- Outcome
- GSH level in roots or shootse0
- Direction
- did not result In an enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposure to 0.1 or 1.0mM GSH did not result In an enhanced GSH level in roots or shoots”
t0“tobacco plants”
Claim · model-written summary
Cysteine contents remained unchanged after GSH exposure.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- exposure to 0.1 or 1.0mM GSHe1
- Outcome
- cysteine contentse0
- Direction
- remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Also the cysteine contents remained unchanged”
e1“exposure to 0.1 or 1.0mM GSH”
t0“tobacco plants”
Claim · model-written summary
Feeding GSH to a mature leaf inhibited root sulphate uptake and shoot transport.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- Flap-feeding of GSH to a mature leafe0
- Outcome
- net uptake of sulphate by the roots and its transport to the shoote0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flap-feeding of GSH to a mature leaf resulted in an inhibition of net uptake of sulphate by the roots and its transport to the shoot”
t0“tobacco plants”
Claim · model-written summary
The authors infer that leaf-produced GSH signals control of plant sulphur nutrition.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Outcome
- sulphur nutrition of plantse0
- Qualifier
- acts as a signale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GSH produced in the leaves acts as a signal to control sulphur nutrition of plants”
t0“tobacco plants”
The same questions in other papers
glutathione · nutrient: content · Nicotiana tabacum (tobacco)Positive and negative results
1 in the opposite direction
- positive
L-cysteine · nutrient: content · Nicotiana tabacum (tobacco)Results agree
1 paper in the same direction as this paper
- negative
glutathione · molecular: metabolites · Nicotiana tabacum (tobacco)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.