Abstract
Comparative effects of partial root-zone irrigation (PRI) and deficit irrigation (DI) on stomatal conductance (gs), nitrogen accumulation and distribution in tomato (Lycopersicon esculentum L.) plants were investigated in a split-root pot experiment. Results showed that both PRI and DI saved 25% water and led to 10.0% and 17.5% decreases in dry biomass, respectively, compared with the fully irrigated (FI) controls. Consequently, water use efficiency (WUE) was increased by 18.6% and 10.8% in the PRI and DI plants, respectively. The highest WUE in the PRI plants was associated with the highest carbon isotope composition (d13C), indicating that the improvement of WUE might have been a result of long-term optimisation of stomatal control over gas exchange. The constantly higher xylem sap ABA concentration in PRI compared with DI plants was seemingly responsible for the greater control over stomatal conductance during the treatment. At the end of the experiment, N accumulation and 15N recovery was highest in FI, intermediate in PRI and lowest in DI. In addition, PRI plants consistently allocated more N into the upper and middle leaf layers than in the FI and DI treatments. The improved N nutrition and distribution in the canopy may indicate that PRI plants have a greater photosynthetic capacity than DI plants; this is confirmed by the observed positive linear relationship between specific leaf N content and d13C. It is concluded that PRI improves N nutrition and optimises N distribution in the canopy, which might have been partly contributed to the high WUE in PRI tomato plants.
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Claims 14
Claim · model-written summary
PRI saved 25% water relative to full irrigation.
- Taxon
- tomato
Solanum lycopersicume2 - Treatment
- PRIe0
- Outcome
- watere0
- Direction
- savede0
- Value
- 25%e0
- Comparator
- fully irrigated (FI) controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both PRI and DI saved 25% water”
e1“fully irrigated (FI) controls”
e2“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
DI saved 25% water relative to full irrigation.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- DIe0
- Outcome
- watere0
- Direction
- savede0
- Value
- 25%e0
- Comparator
- fully irrigated (FI) controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both PRI and DI saved 25% water”
e1“fully irrigated (FI) controls”
e2“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
PRI decreased dry biomass by 10.0% versus full irrigation.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- PRIe1
- Outcome
- dry biomasse0
- Direction
- decreasese0
- Value
- 10.0%e0
- Comparator
- fully irrigated (FI) controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10.0% and 17.5% decreases in dry biomass, respectively, compared with the fully irrigated (FI) controls”
e1“both PRI and DI saved 25% water”
e2“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
DI decreased dry biomass by 17.5% versus full irrigation.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- DIe1
- Outcome
- dry biomasse0
- Direction
- decreasese0
- Value
- 17.5%e0
- Comparator
- fully irrigated (FI) controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10.0% and 17.5% decreases in dry biomass, respectively, compared with the fully irrigated (FI) controls”
e1“both PRI and DI saved 25% water”
e2“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
PRI increased water use efficiency by 18.6%.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- PRIe0
- Outcome
- water use efficiency (WUE)e0
- Direction
- increasede0
- Value
- 18.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency (WUE) was increased by 18.6% and 10.8% in the PRI and DI plants, respectively”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
DI increased water use efficiency by 10.8%.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- DIe0
- Outcome
- water use efficiency (WUE)e0
- Direction
- increasede0
- Value
- 10.8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency (WUE) was increased by 18.6% and 10.8% in the PRI and DI plants, respectively”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
PRI had the highest WUE associated with the highest carbon isotope composition.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- PRIe0
- Outcome
- WUEe0
- Direction
- higheste0
- Qualifier
- highest carbon isotope composition (d13C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest WUE in the PRI plants was associated with the highest carbon isotope composition (d13C)”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
PRI had consistently higher xylem sap ABA than DI.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- PRIe0
- Outcome
- xylem sap ABA concentratione0
- Direction
- highere0
- Comparator
- DIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“constantly higher xylem sap ABA concentration in PRI compared with DI plants”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
PRI xylem ABA was proposed to explain greater stomatal control.
- Taxon
- tomatoSolanum lycopersicume1
- Compound
- ABAe0
- Outcome
- control over stomatal conductancee0
- Qualifier
- seemingly responsiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“constantly higher xylem sap ABA concentration in PRI compared with DI plants was seemingly responsible for the greater control over stomatal conductance during the treatment”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
N accumulation was highest in FI, intermediate in PRI and lowest in DI.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- N accumulatione0
- Direction
- higheste0
- Qualifier
- intermediate in PRI and lowest in DIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N accumulation and 15N recovery was highest in FI, intermediate in PRI and lowest in DI”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
15N recovery was highest in FI, intermediate in PRI and lowest in DI.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- 15N recoverye0
- Direction
- higheste0
- Qualifier
- intermediate in PRI and lowest in DIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N accumulation and 15N recovery was highest in FI, intermediate in PRI and lowest in DI”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
PRI allocated more N to upper and middle leaves than FI and DI.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- PRIe0
- Outcome
- N into the upper and middle leaf layerse0
- Direction
- moree0
- Comparator
- FI and DI treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRI plants consistently allocated more N into the upper and middle leaf layers than in the FI and DI treatments”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
Specific leaf N content was positively linearly related to carbon isotope composition.
- Taxon
- tomatoSolanum lycopersicume1
- Compound
- d13Ce0
- Outcome
- specific leaf N contente0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“observed positive linear relationship between specific leaf N content and d13C”
e1“tomato (Lycopersicon esculentum L.)”
Claim · model-written summary
The authors conclude PRI improves nitrogen nutrition and canopy distribution, possibly contributing to high WUE.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- PRIe0
- Outcome
- high WUEe0
- Qualifier
- improves N nutrition and optimises N distribution in the canopye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRI improves N nutrition and optimises N distribution in the canopy, which might have been partly contributed to the high WUE in PRI tomato plants”
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See all 175 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.