Abstract
Tomato plants were grown in peatmoss-based substrate and supplied with nutrient solution of high (4.5 mS·cm –1 ) or low (2.3 mS·cm –1 ) electrical conductivity (EC) under high (95%) or low (55% of capillary capacity) substrate water content (SWC) to examine the effects of high EC and low SWC on growth and physiology. Salts were allowed to accumulate in the substrate for 7 weeks. Both high EC and low SWC significantly decreased dry matter production (DMP) and fruit yield (FY). Fruit harvest index was lower in high EC- or low SWC-treated plants. Decrease in marketable FY was attributed to both the decrease in total FY and the increase in small and abnormal (cracked and rot) fruits. Both high EC and low SWC decreased photosynthesis (P N ) and leaf water potential (Ψ L ). However, chlorophyll content and respiration were increased by high EC under both high and low SWC. Water consumption based on both whole plant and unit of leaf area was decreased by high EC and low SWC. Ψ L and transpiration were depressed by high EC and low SWC, especially at midday. There was a significant positive correlation between fruit yield and water consumption. The effects of high EC and low SWC were additive on most of the variables. Decreases in Ψ L might ultimately account for water consumption reduction, P N depression, and FY decrease.
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Claims 15
Claim · model-written summary
High conductivity reduced dry matter production and fruit yield significantly.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- high ECe1
- Outcome
- dry matter production (DMP) and fruit yield (FY)e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Both high EC and low SWC significantly decreased dry matter production (DMP) and fruit yield (FY)”
Claim · model-written summary
Low substrate water content reduced dry matter production and fruit yield significantly.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- low SWCe1
- Outcome
- dry matter production (DMP) and fruit yield (FY)e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Both high EC and low SWC significantly decreased dry matter production (DMP) and fruit yield (FY)”
Claim · model-written summary
High conductivity lowered fruit harvest index.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high ECe1
- Outcome
- Fruit harvest indexe1
- Direction
- lowere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Fruit harvest index was lower in high EC- or low SWC-treated plants”
Claim · model-written summary
Low substrate water content lowered fruit harvest index.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- low SWCe1
- Outcome
- Fruit harvest indexe1
- Direction
- lowere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Fruit harvest index was lower in high EC- or low SWC-treated plants”
Claim · model-written summary
Marketable fruit yield declined with lower total yield and more small and abnormal fruits.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- marketable FYe1
- Qualifier
- decrease in total FY and the increase in small and abnormal (cracked and rot) fruitse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Decrease in marketable FY was attributed to both the decrease in total FY and the increase in small and abnormal (cracked and rot) fruits”
Claim · model-written summary
High conductivity reduced photosynthesis and leaf water potential.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high ECe1
- Outcome
- photosynthesis (P N ) and leaf water potential (Ψ L )e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Both high EC and low SWC decreased photosynthesis (P N ) and leaf water potential (Ψ L )”
Claim · model-written summary
Low substrate water content reduced photosynthesis and leaf water potential.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- low SWCe1
- Outcome
- photosynthesis (P N ) and leaf water potential (Ψ L )e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Both high EC and low SWC decreased photosynthesis (P N ) and leaf water potential (Ψ L )”
Claim · model-written summary
High conductivity increased chlorophyll content and respiration under both water regimes.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high ECe1
- Outcome
- chlorophyll content and respiratione1
- Direction
- increasede1
- Qualifier
- under both high and low SWCe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“chlorophyll content and respiration were increased by high EC under both high and low SWC”
Claim · model-written summary
High conductivity decreased whole plant and leaf area based water consumption.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high ECe1
- Outcome
- Water consumption based on both whole plant and unit of leaf areae1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Water consumption based on both whole plant and unit of leaf area was decreased by high EC and low SWC”
Claim · model-written summary
Low substrate water content decreased whole plant and leaf area based water consumption.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- low SWCe1
- Outcome
- Water consumption based on both whole plant and unit of leaf areae1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Water consumption based on both whole plant and unit of leaf area was decreased by high EC and low SWC”
Claim · model-written summary
High conductivity depressed leaf water potential and transpiration especially at midday.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high ECe1
- Outcome
- Ψ L and transpiratione1
- Direction
- depressede1
- Qualifier
- especially at middaye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Ψ L and transpiration were depressed by high EC and low SWC, especially at midday”
Claim · model-written summary
Low substrate water content depressed leaf water potential and transpiration especially at midday.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- low SWCe1
- Outcome
- Ψ L and transpiratione1
- Direction
- depressede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Ψ L and transpiration were depressed by high EC and low SWC, especially at midday”
Claim · model-written summary
Fruit yield correlated positively with water consumption.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- fruit yielde1
- Direction
- positivee1
- Qualifier
- water consumptione1
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“significant positive correlation between fruit yield and water consumption”
Claim · model-written summary
High conductivity and low water content had additive effects on most variables.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- effects of high EC and low SWCe1
- Direction
- additivee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“The effects of high EC and low SWC were additive on most of the variables”
Claim · model-written summary
Authors propose that lower leaf water potential may explain lower water use, photosynthesis and yield.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- water consumption reduction, P N depression, and FY decreasee1
- Qualifier
- Decreases in Ψ Le1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e1“Decreases in Ψ L might ultimately account for water consumption reduction, P N depression, and FY decrease”
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