Abstract
Comparative effects of partial root-zone irrigation (PRI) and deficit irrigation (DI) on xylem pH, ABA, and ionic concentrations of tomato (Lycopersicon esculentum L.) plants were investigated in two split-root pot experiments. Results showed that PRI plants had similar or significantly higher xylem pH, which was increased by 0.2 units relative to DI plants. Nitrate and total ionic concentrations (cations+anions), and the proportion of cations influenced xylem pH such that xylem pH increases as nitrate and total ionic concentrations decrease, and the proportion of cations increases. In most cases, the xylem ABA concentration was similar for PRI and DI plants, and a clear association between increases in xylem pH with increasing xylem ABA concentration was only found when the soil water content was relatively low. The concentrations of anions, cations, and the sum of anions and cations in PRI were higher than in the DI treatment when soil water content was relatively high in the wetted soil compartment. However, when water content in both soil compartments of the PRI pots were very low before the next irrigation, the acquisition of nutrients by roots was reduced, resulting in lower concentrations of anions and cations in the PRI than in the DI treatment. It is therefore essential that the soil water content in the wet zone should be maintained relatively high while that in the drying soil zone should not be very low, both conditions are crucial to maintain high soil and plant water status while sustaining ABA signalling of the plants.
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Claims 7
Claim · model-written summary
Partial root-zone irrigation produced similar or significantly higher tomato xylem pH than deficit irrigation, with an increase of 0.2 units.
- Taxon
- tomatoes
Solanum lycopersicumt0 - Treatment
- PRIe0
- Outcome
- xylem pHe0
- Direction
- highere0
- Value
- 0.2 unitse0
- Comparator
- DI plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRI plants had similar or significantly higher xylem pH, which was increased by 0.2 units relative to DI plants.”
t0“tomatoes”
Claim · model-written summary
Xylem pH increased as nitrate and total ionic concentrations decreased and cation proportion increased.
- Taxon
- tomatoesSolanum lycopersicumt0
- Compound
- nitratee0
- Outcome
- xylem pHe0
- Direction
- increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“xylem pH increases as nitrate and total ionic concentrations decrease, and the proportion of cations increases.”
t0“tomatoes”
Claim · model-written summary
Xylem ABA concentration was usually similar under partial root-zone and deficit irrigation.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- PRIe0
- Outcome
- xylem ABA concentratione0
- Direction
- similare0
- Qualifier
- In most casese0
- Comparator
- DI plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most cases, the xylem ABA concentration was similar for PRI and DI plants”
t0“tomatoes”
Claim · model-written summary
Higher xylem pH was associated with higher ABA concentration only at relatively low soil water content.
- Taxon
- tomatoesSolanum lycopersicumt0
- Compound
- ABAe0
- Outcome
- xylem pHe0
- Direction
- increasese0
- Qualifier
- soil water content was relatively lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a clear association between increases in xylem pH with increasing xylem ABA concentration was only found when the soil water content was relatively low.”
t0“tomatoes”
Claim · model-written summary
At relatively high water content in the wetted compartment, partial root-zone irrigation yielded higher xylem anion, cation and summed ion concentrations than deficit irrigation.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- PRIe0
- Outcome
- concentrations of anions, cations, and the sum of anions and cationse0
- Direction
- highere0
- Qualifier
- soil water content was relatively high in the wetted soil compartmente0
- Comparator
- DI treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentrations of anions, cations, and the sum of anions and cations in PRI were higher than in the DI treatment when soil water content was relatively high in the wetted soil compartment.”
t0“tomatoes”
Claim · model-written summary
When both partial root-zone compartments were very dry, its xylem anion and cation concentrations were lower than under deficit irrigation.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- PRIe0
- Outcome
- concentrations of anions and cationse0
- Direction
- lowere0
- Qualifier
- water content in both soil compartments of the PRI pots were very low before the next irrigatione0
- Comparator
- DI treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when water content in both soil compartments of the PRI pots were very low before the next irrigation, the acquisition of nutrients by roots was reduced, resulting in lower concentrations of anions and cations in the PRI than in the DI treatment.”
t0“tomatoes”
Claim · model-written summary
The authors recommend keeping the wet zone relatively moist and avoiding very low water content in the drying zone.
- Taxon
- tomatoesSolanum lycopersicumt0
- Outcome
- soil water content in the wet zone should be maintained relatively high while that in the drying soil zone should not be very lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soil water content in the wet zone should be maintained relatively high while that in the drying soil zone should not be very low”
t0“tomatoes”
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