Abstract
ABSTRACT The findings of an experiment using serially harvested young tomato plants grown in water culture are reported, showing the dramatic influence of sulfur status of the nutrient medium on transport of molybdenum in xylem sap. On average for the five harvests taken over a 14 d growth period, the molybdenum (Mo) concentration in the sap was approximately 11 times greater in the absence of sulfate in the nutrient medium. Restoring sulfate to the nutrient medium without sulfur (S) on day four of the experiment depressed the Mo concentration of the sap at the next harvest (taken three days later) to a value similar to that in plants receiving sulfate from the onset of the growth period and, similarly, raised the S concentration as well. Rates of transport of Mo as measured by root pressure exudates were slightly less spectacular, as S deficiency depressed the rate of exudation. The results support the concept that sulfate and molybdate compete for the same carrier and transport sites in uptake, and that sulfate deficiency leads to excess Mo uptake. The findings are of little consequence for plant cultivation, as plants are tolerant to elevated Mo concentrations, but are relevant to animal nutrition—particularly that of ruminants, which are susceptible to excess Mo and Mo-induced copper (Cu) deficiency.
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Claims 6
Claim · model-written summary
Sulfate absence raised average molybdenum concentration in tomato xylem sap approximately 11-fold over five harvests.
- Taxon
- Tomato Plants
Solanum lycopersicumt0 - Treatment
- absence of sulfate in the nutrient mediume0
- Outcome
- molybdenum (Mo) concentration in the sape0
- Direction
- greatere0
- Value
- approximately 11 timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On average for the five harvests taken over a 14 d growth period, the molybdenum (Mo) concentration in the sap was approximately 11 times greater in the absence of sulfate in the nutrient medium.”
t0“Tomato Plants”
Claim · model-written summary
Restoring sulfate on day four lowered sap Mo concentration at the next harvest to near that of continually sulfate-fed plants.
- Taxon
- Tomato PlantsSolanum lycopersicumt0
- Treatment
- Restoring sulfate to the nutrient mediume0
- Outcome
- Mo concentration of the sape0
- Direction
- depressede0
- Comparator
- plants receiving sulfate from the onset of the growth periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restoring sulfate to the nutrient medium without sulfur (S) on day four of the experiment depressed the Mo concentration of the sap at the next harvest (taken three days later) to a value similar to that in plants receiving sulfate from the onset of the growth period”
t0“Tomato Plants”
Claim · model-written summary
Sulfate restoration raised sap sulfur concentration.
- Taxon
- Tomato PlantsSolanum lycopersicumt0
- Treatment
- Restoring sulfate to the nutrient mediume0
- Outcome
- S concentratione1
- Direction
- raisede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restoring sulfate to the nutrient medium without sulfur (S) on day four of the experiment”
e1“similarly, raised the S concentration as well”
t0“Tomato Plants”
Claim · model-written summary
Sulfur deficiency depressed root-pressure exudation rate.
- Taxon
- Tomato PlantsSolanum lycopersicumt0
- Treatment
- S deficiencye0
- Outcome
- rate of exudatione0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S deficiency depressed the rate of exudation”
t0“Tomato Plants”
Claim · model-written summary
The authors inferred that sulfate and molybdate compete for uptake carriers and sites.
- Taxon
- Tomato PlantsSolanum lycopersicumt0
- Compound
- sulfate and molybdatee0
- Outcome
- compete for the same carrier and transport sites in uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sulfate and molybdate compete for the same carrier and transport sites in uptake”
t0“Tomato Plants”
Claim · model-written summary
The authors inferred sulfate deficiency causes excess Mo uptake.
- Taxon
- Tomato PlantsSolanum lycopersicumt0
- Treatment
- sulfate deficiencye0
- Outcome
- excess Mo uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sulfate deficiency leads to excess Mo uptake”
t0“Tomato Plants”
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9 papers in the same direction as this paper · 7 in the opposite direction
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See all 17 papers →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.