Abstract
Using standard microelectrode techniques, we measured the effects of fusaric acid (FA) on the membrane potential of tomato (Lycopersicon esculentum Mill. cv New Yorker 870) incipient root hair cells. At pH 5.3, FA caused a hyerpolarization, the magnitude of which increased with FA concentrations from 0.05 to 0.50 millimolar. A depolarization followed, the rate and magnitude of which increased with the concentration of FA and exposure to FA. Partial repolarizations occurred after exposures to 1.0 millimolar FA for less than 8 to 10 minutes, after longer exposures to lower FA concentrations, or after longer exposures to 1.0 millimolar FA in a less concentrated nutrient solution. The amount of ATP in tomato root tips decreased by about 85% after incubation for 80 min in 1.0 millimolar FA.At pH 7.2 and 8.2, the depolarization caused by an 8-minute exposure to 1.0 millimolar FA was immediate and much more rapid than at pH 5.2 and 6.3, but its magnitude was not as great. At pH 6.3, 7.2, and 8.2, the depolarization was at least partially reversible. The data are consistent with FA having at least three effects that elicited changes in tomato root cell electrical potential differences between the cell's interior and the external solution.
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Claims 6
Claim · model-written summary
Fusaric acid caused tomato root-hair cell hyperpolarization at pH 5.3, increasing with concentration.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- FAe0
- Outcome
- hyerpolarizatione0
- Direction
- increasede0
- Qualifier
- At pH 5.3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At pH 5.3, FA caused a hyerpolarization, the magnitude of which increased with FA concentrations from 0.05 to 0.50 millimolar.”
t0“tomato”
Claim · model-written summary
Fusaric acid then caused depolarization whose rate and magnitude increased with concentration and exposure.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- FAe0
- Outcome
- rate and magnitudee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A depolarization followed, the rate and magnitude of which increased with the concentration of FA and exposure to FA.”
t0“tomato”
Claim · model-written summary
Partial repolarization followed certain exposures to fusaric acid.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- FAe0
- Outcome
- Partial repolarizationse0
- Qualifier
- after exposures to 1.0 millimolar FA for less than 8 to 10 minutes, after longer exposures to lower FA concentrations, or after longer exposures to 1.0 millimolar FA in a less concentrated nutrient solutione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partial repolarizations occurred after exposures to 1.0 millimolar FA for less than 8 to 10 minutes, after longer exposures to lower FA concentrations, or after longer exposures to 1.0 millimolar FA in a less concentrated nutrient solution.”
t0“tomato”
Claim · model-written summary
Tomato root-tip ATP fell about 85% after 80 minutes in 1.0 millimolar fusaric acid.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- root tipse0
- Treatment
- 1.0 millimolar FAe0
- Outcome
- amount of ATPe0
- Direction
- decreasede0
- Value
- about 85%e0
- Qualifier
- 80 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of ATP in tomato root tips decreased by about 85% after incubation for 80 min in 1.0 millimolar FA.”
Claim · model-written summary
At pH 7.2 and 8.2, fusaric acid depolarization was faster but smaller than at pH 5.2 and 6.3.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 1.0 millimolar FAe0
- Outcome
- depolarizatione0
- Direction
- much more rapide0
- Qualifier
- At pH 7.2 and 8.2e0
- Comparator
- at pH 5.2 and 6.3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At pH 7.2 and 8.2, the depolarization caused by an 8-minute exposure to 1.0 millimolar FA was immediate and much more rapid than at pH 5.2 and 6.3, but its magnitude was not as great.”
t0“tomato”
Claim · model-written summary
Fusaric-acid depolarization was partly reversible at pH 6.3, 7.2 and 8.2.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- depolarization was at least partially reversiblee0
- Qualifier
- At pH 6.3, 7.2, and 8.2e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At pH 6.3, 7.2, and 8.2, the depolarization was at least partially reversible.”
t0“tomato”
The same questions in other papers
Fusaric acid · molecular: metabolites · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- no effect
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.