Abstract
Greenhouse tomato plants (Lycopersicon esculentum Mill. cv. Capello) were grown in a peat-moss based substrate (70% sphag peat and 30% perlite, v/v) and treated with a salinity stress (4.5 mS cm-1 of electrical conductivity, EC) and a low (55 ± 8% on gra-vimetric basis) substrate water content (SWC) to examine the effects of salt accumulation and a prolonged substrate water deficit on photosynthesis and plant water relations. Net photosynthetic rate (Pn) decreased by 24% compared to the control one day after SWC was depleted to 55%. However, as SWC was maintained at the same level for several days, the effect of water stress diminished, with the decreasing extent of 14%, 15%, and 14% compared to the control on the 11th, 16th, and 28th days, respectively, from the beginning of treatments. This demonstrated that tomato plants acclimated to substrate water deficit. One day after SWC reached 55%, leaf turgor potential (ΨP) decreased sub-stantially as leaf water potential (ΨW) declined. However, as SWC was maintained con-stant over a period, ΨP recovered to a large extent even at the same Ψw level. This tur-gor recovery was based on osmotic adjustment shown by the decrease in osmotic poten-tial (Ψπ) at fully hydrated status. The effect of salinity on Pn was not observed under both high and low SWC one day after the beginning of treatments, but that effect became larger and larger as the treatment was prolonged. Although ΨW and Ψp declined steadi-ly in salinity stressed plants during the experiment, osmotic adjustment also occurred, re-sulting in a partial turgor maintenance. The combined treatment of salinity and water de-ficit imposed an additive effect on Pn, ΨW, and Ψp, which did not allow Pn to recover despite the osmotic adjustment.
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Claims 16
Claim · model-written summary
Water deficit reduced net photosynthetic rate by 24% one day after substrate water content reached 55%.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- SWC was depleted to 55%e0
- Outcome
- Net photosynthetic rate (Pn)e0
- Direction
- decreasede0
- Value
- 24%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net photosynthetic rate (Pn) decreased by 24% compared to the control one day after SWC was depleted to 55%.”
t0“Tomato”
Claim · model-written summary
Water deficit reduced photosynthetic rate by 14% versus control on day 11th.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- water stresse0
- Outcome
- effect of water stresse0
- Direction
- decreasinge0
- Value
- 14%e0
- Qualifier
- 11the0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, as SWC was maintained at the same level for several days, the effect of water stress diminished, with the decreasing extent of 14%, 15%, and 14% compared to the control on the 11th, 16th, and 28th days, respectively, from the beginning of treatments.”
t0“Tomato”
Claim · model-written summary
Water deficit reduced photosynthetic rate by 15% versus control on day 16th.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- water stresse0
- Outcome
- effect of water stresse0
- Direction
- decreasinge0
- Value
- 15%e0
- Qualifier
- 16the0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, as SWC was maintained at the same level for several days, the effect of water stress diminished, with the decreasing extent of 14%, 15%, and 14% compared to the control on the 11th, 16th, and 28th days, respectively, from the beginning of treatments.”
t0“Tomato”
Claim · model-written summary
Water deficit reduced photosynthetic rate by 14% versus control on day 28th.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- water stresse0
- Outcome
- effect of water stresse0
- Direction
- decreasinge0
- Value
- 14%e0
- Qualifier
- 28the0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, as SWC was maintained at the same level for several days, the effect of water stress diminished, with the decreasing extent of 14%, 15%, and 14% compared to the control on the 11th, 16th, and 28th days, respectively, from the beginning of treatments.”
t0“Tomato”
Claim · model-written summary
Leaf turgor potential fell one day after substrate water content reached 55%.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- SWC reached 55%e0
- Outcome
- leaf turgor potential (ΨP)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One day after SWC reached 55%, leaf turgor potential (ΨP) decreased sub-stantially as leaf water potential (ΨW) declined.”
t0“Tomato”
Claim · model-written summary
Leaf water potential fell one day after substrate water content reached 55%.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- SWC reached 55%e0
- Outcome
- leaf water potential (ΨW)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One day after SWC reached 55%, leaf turgor potential (ΨP) decreased sub-stantially as leaf water potential (ΨW) declined.”
t0“Tomato”
Claim · model-written summary
Turgor potential largely recovered while substrate water content stayed constant.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- ΨPe0
- Direction
- recoverede0
- Qualifier
- SWC was maintained con-stante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, as SWC was maintained con-stant over a period, ΨP recovered to a large extent even at the same Ψw level.”
t0“Tomato”
Claim · model-written summary
Osmotic potential decreased at full hydration, indicating osmotic adjustment underlying turgor recovery.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- osmotic poten-tial (Ψπ)e0
- Direction
- decreasee0
- Qualifier
- osmotic adjustmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This tur-gor recovery was based on osmotic adjustment shown by the decrease in osmotic poten-tial (Ψπ) at fully hydrated status.”
t0“Tomato”
Claim · model-written summary
Salinity had no observed effect on photosynthetic rate one day after treatment at high or low substrate water content.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- salinitye0
- Outcome
- Pne0
- Direction
- not observede0
- Qualifier
- both high and low SWC one day after the beginning of treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of salinity on Pn was not observed under both high and low SWC one day after the beginning of treatments, but that effect became larger and larger as the treatment was prolonged.”
t0“Tomato”
Claim · model-written summary
The salinity effect on photosynthetic rate increased as treatment continued.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- salinitye0
- Outcome
- Pne0
- Direction
- larger and largere0
- Qualifier
- as the treatment was prolongede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of salinity on Pn was not observed under both high and low SWC one day after the beginning of treatments, but that effect became larger and larger as the treatment was prolonged.”
t0“Tomato”
Claim · model-written summary
Leaf water potential steadily declined in salinity stressed plants.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- salinity stressede0
- Outcome
- ΨWe0
- Direction
- declined steadi-lye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although ΨW and Ψp declined steadi-ly in salinity stressed plants during the experiment, osmotic adjustment also occurred, re-sulting in a partial turgor maintenance.”
t0“Tomato”
Claim · model-written summary
Leaf turgor potential steadily declined in salinity stressed plants.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- salinity stressede0
- Outcome
- Ψpe0
- Direction
- declined steadi-lye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although ΨW and Ψp declined steadi-ly in salinity stressed plants during the experiment, osmotic adjustment also occurred, re-sulting in a partial turgor maintenance.”
t0“Tomato”
Claim · model-written summary
Osmotic adjustment under salinity partially maintained turgor.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- partial turgor maintenancee0
- Qualifier
- osmotic adjustmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although ΨW and Ψp declined steadi-ly in salinity stressed plants during the experiment, osmotic adjustment also occurred, re-sulting in a partial turgor maintenance.”
t0“Tomato”
Claim · model-written summary
Combined salinity and water deficit prevented recovery of photosynthetic rate despite osmotic adjustment.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- combined treatment of salinity and water de-ficite0
- Outcome
- Pne0
- Direction
- did not allow Pn to recovere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined treatment of salinity and water de-ficit imposed an additive effect on Pn, ΨW, and Ψp, which did not allow Pn to recover despite the osmotic adjustment.”
t0“Tomato”
Claim · model-written summary
Combined salinity and water deficit had an additive effect on leaf water potential.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- combined treatment of salinity and water de-ficite0
- Outcome
- ΨWe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined treatment of salinity and water de-ficit imposed an additive effect on Pn, ΨW, and Ψp, which did not allow Pn to recover despite the osmotic adjustment.”
t0“Tomato”
Claim · model-written summary
Combined salinity and water deficit had an additive effect on leaf turgor potential.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- combined treatment of salinity and water de-ficite0
- Outcome
- Ψpe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined treatment of salinity and water de-ficit imposed an additive effect on Pn, ΨW, and Ψp, which did not allow Pn to recover despite the osmotic adjustment.”
t0“Tomato”
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