Abstract
Abstract Plant root systems are exposed to spatial and temporal heterogeneity regarding water availability. In the long‐term, compensation, increased uptake by roots in areas with favorable conditions in response to decreased uptake in areas under stress, is driven by root growth and distribution. In the short‐term (hours–days), compensative processes are less understood. We hypothesized hydraulic compensation where local lowered water availability is accompanied by increased uptake from areas where water remains available. Our objective was to quantify instantaneous hydraulic root uptake under conditions of differential water availability. Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters in which each half of the roots could alternatively be exposed to short‐term conditions of salinity. Uptake was quantified from each of the two root zone compartments. One‐sided exposure to salinity immediately led to less uptake from the salt‐affected compartment and increased uptake from the nontreated compartment. Compensation occurred at salinity, caused by NaCl solution of 4 dS m −1 , that did not decrease uptake in plants with entire root systems exposed. At higher salinity, 6.44 dS m −1 , transpiration decreased by ∼50% when the total root system was exposed. When only half of the roots were exposed, total uptake was maintained at levels of nonstressed plants with as much as 85% occurring from the nontreated compartment. The extent of compensation was not absolute and apparently a function of salinity, atmospheric demand, and duration of exposure. As long as there is no hydraulic restriction in other areas, temporary reduction in water availability in some parts of a tomato's root zone will not affect plant‐scale transpiration.
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Claims 6
Claim · model-written summary
Salinity on one side immediately reduced water uptake from the affected root compartment.
- Taxon
- Tomato
Solanum lycopersicume0 - Treatment
- One‐sided exposure to salinitye1
- Outcome
- uptake from the salt‐affected compartmente1
- Direction
- lesse1
- Comparator
- nontreated compartmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters”
e1“One‐sided exposure to salinity immediately led to less uptake from the salt‐affected compartment and increased uptake from the nontreated compartment.”
Claim · model-written summary
One-sided salinity increased uptake from the untreated root compartment.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- One‐sided exposure to salinitye1
- Outcome
- uptake from the nontreated compartmente1
- Direction
- increasede1
- Comparator
- salt‐affected compartmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters”
e1“One‐sided exposure to salinity immediately led to less uptake from the salt‐affected compartment and increased uptake from the nontreated compartment.”
Claim · model-written summary
Compensation occurred at 4 dS m −1 salinity, which did not decrease uptake when all roots were exposed.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- NaCl solution of 4 dS m −1e1
- Outcome
- Compensatione1
- Value
- 4 dS m −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters”
e1“Compensation occurred at salinity, caused by NaCl solution of 4 dS m −1 , that did not decrease uptake in plants with entire root systems exposed.”
Claim · model-written summary
Exposure of the entire root system to 6.44 dS m −1 salinity decreased transpiration by about 50%.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- 6.44 dS m −1e1
- Outcome
- transpiratione1
- Direction
- decreasede1
- Value
- ∼50%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters”
e1“At higher salinity, 6.44 dS m −1 , transpiration decreased by ∼50% when the total root system was exposed.”
Claim · model-written summary
With half the roots exposed, total uptake remained at nonstressed levels, with up to 85% from untreated roots.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- half of the roots were exposede1
- Outcome
- total uptakee1
- Direction
- maintainede1
- Value
- 85%e1
- Comparator
- nonstressed plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters”
e1“When only half of the roots were exposed, total uptake was maintained at levels of nonstressed plants with as much as 85% occurring from the nontreated compartment.”
Claim · model-written summary
Compensation depended on salinity, atmospheric demand and exposure duration.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- salinitye1
- Outcome
- extent of compensatione1
- Qualifier
- atmospheric demand, and duration of exposuree1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato ( Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters”
e1“The extent of compensation was not absolute and apparently a function of salinity, atmospheric demand, and duration of exposure.”
The same questions in other papers
salinity · nutrient: content · Solanum lycopersicum (tomato)Positive and negative results
7 papers in the same direction as this paper · 58 in the opposite direction
- negative
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62 papers more in this group
See all 66 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.