Abstract
Greenhouse tomato plants (Lycopersicon esculentum Mill. cv. Capello) were grown in peat bags and rockwool slabs to examine the effects of varying the electrical conductivity (EC) of the nutrient solution and substrate matric water potential (Ψsub) on plant water rela- tions. EC of the nutrient solution delivered to peat bags varied between 1 to 4 dS•m-1 with Ψsub of either-5 kPa or-9 kPa as the setpoint for starting the irrigation. The EC variations were adjusted automatically by a computer system according to potential eva- potranspiration (PET), which was calculated from radiation and vapor pressure deficit. Plants in rockwool slabs were treated with three EC levels, 2.5, 4.0 and 5.5 dS•m-1. Plants in both peat bags and rockwool slabs were overwatered once a week to leach accumulated salts out of the substrates. Before plants were overwatered, leaf water potential (ΨL) was lower in the plants treated with high EC and low Ψsub, but turgor potential (P) was maintained close to the control value. This was attributed to the osmo- tic adjustment caused mainly by the active solute accumulation. After plants under high EC or low Ψsub were overwatered, ΨL recovered to the control level, and P became high- er because of the lower osmotic potential (π) than in the control plants. At a given ΨL, the plants under variable EC, high EC, and low Ψsub maintained higher leaf relative wa- ter content (ζ). These leaves had high turgid water content, high symplasmic (osmotically active) water content, low apoplasmic (osmotically inactive) watger content and low ζ at the point of zero turgor (incipient plasmolysis). EC variations in peat bags according to PET caused osmotic adjustment and turgor regulation although the extent was small. Maintenance of P after overwatering was directly proportional to stomatal conductance and photsynthetic rate. Our results suggested that tomato plants adjusted their internal water status and compartment of tissue water in symplasmic and apoplasmic fractions in response to high EC and low Ψsub and that varying EC together with overwatering plants once a week not only reduced salinity stress but also favored turgor maintenance.
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Claims 13
Claim · model-written summary
Before overwatering, tomato plants treated with high EC and low substrate matric water potential had lower leaf water potential.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- high EC and low Ψsube0
- Outcome
- leaf water potential (ΨL)e0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“Before plants were overwatered, leaf water potential (ΨL) was lower in the plants treated with high EC and low Ψsub”
Claim · model-written summary
Before overwatering, turgor potential of tomato plants under high EC and low Ψsub was maintained close to the control value.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high EC and low Ψsube0
- Outcome
- turgor potential (P)e0
- Direction
- maintained close toe0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“Before plants were overwatered, leaf water potential (ΨL) was lower in the plants treated with high EC and low Ψsub, but turgor potential (P) was maintained close to the control value”
Claim · model-written summary
After overwatering, leaf water potential of tomato plants under high EC or low Ψsub recovered to the control level.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high EC or low Ψsube0
- Outcome
- ΨLe0
- Direction
- recoverede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“After plants under high EC or low Ψsub were overwatered, ΨL recovered to the control level”
Claim · model-written summary
After overwatering, turgor potential of tomato plants under high EC or low Ψsub became higher than in control plants, because of a lower osmotic potential.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high EC or low Ψsube0
- Outcome
- Pe0
- Direction
- higherinferrede0
- Qualifier
- lower osmotic potential (π)e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“After plants under high EC or low Ψsub were overwatered, ΨL recovered to the control level, and P became high- er because of the lower osmotic potential (π) than in the control plants”
Claim · model-written summary
The maintained turgor potential was attributed to osmotic adjustment caused mainly by active solute accumulation.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- osmo- tic adjustmente0
- Qualifier
- active solute accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“This was attributed to the osmo- tic adjustment caused mainly by the active solute accumulation”
Claim · model-written summary
At a given leaf water potential, tomato plants under variable EC, high EC and low Ψsub maintained higher leaf relative water content.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- variable EC, high EC, and low Ψsube0
- Outcome
- leaf relative wa- ter content (ζ)e0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“At a given ΨL, the plants under variable EC, high EC, and low Ψsub maintained higher leaf relative wa- ter content (ζ)”
Claim · model-written summary
Leaves of these plants had high turgid water content and high symplasmic water content.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- turgid water content, high symplasmic (osmotically active) water contente0
- Direction
- highe0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“These leaves had high turgid water content, high symplasmic (osmotically active) water content”
Claim · model-written summary
Leaves of these plants had low apoplasmic water content and low relative water content at the point of zero turgor.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- apoplasmic (osmotically inactive) watger content and low ζ at the point of zero turgore0
- Direction
- lowe0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“low apoplasmic (osmotically inactive) watger content and low ζ at the point of zero turgor (incipient plasmolysis)”
Claim · model-written summary
EC variations in peat bags according to PET caused osmotic adjustment and turgor regulation in tomato, although the extent was small.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- EC variations in peat bags according to PETe0
- Outcome
- osmotic adjustment and turgor regulatione0
- Qualifier
- extent was smalle0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“EC variations in peat bags according to PET caused osmotic adjustment and turgor regulation although the extent was small”
Claim · model-written summary
Maintenance of turgor potential after overwatering was directly proportional to stomatal conductance and photosynthetic rate.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- overwateringe0
- Outcome
- Maintenance of Pe0
- Direction
- directly proportionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“Maintenance of P after overwatering was directly proportional to stomatal conductance and photsynthetic rate”
Claim · model-written summary
The authors suggest tomato plants adjusted their internal water status and tissue water compartments in response to high EC and low Ψsub.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- high EC and low Ψsube0
- Outcome
- internal water statuse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“tomato plants adjusted their internal water status and compartment of tissue water in symplasmic and apoplasmic fractions in response to high EC and low Ψsub”
Claim · model-written summary
Varying EC together with weekly overwatering reduced salinity stress in tomato.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- varying EC together with overwatering plants once a weeke0
- Outcome
- salinity stresse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“varying EC together with overwatering plants once a week not only reduced salinity stress”
Claim · model-written summary
Varying EC together with weekly overwatering favored turgor maintenance in tomato.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- varying EC together with overwatering plants once a weeke0
- Outcome
- turgor maintenancee0
- Direction
- favorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato”
e0“varying EC together with overwatering plants once a week not only reduced salinity stress but also favored turgor maintenance”
The same questions in other papers
growing medium · physiology: water · Solanum lycopersicum (tomato)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
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4 papers more in this group
See all 8 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.