Abstract
Soil water content and salinity level are seldom uniform in the field, particularly with the use of micro-irrigation systems that may water only a portion of the root zone. A split-root experiment was designed to evaluate growth, nitrate and water uptake and nitrate reduction, when half of the root system of tomato seedlings was stressed with salinity. This study also determines if non-stressed portions of the root system compensated for the decrease in water uptake by stressed portions. Tomato (Lycopersicon esculentum Mill.) seedlings were grown in a growth chamber under controlled conditions with half-strength Hoagland solution. Three different treatments were applied to the split-root system: 1) some seedlings had both parts of their roots in control solution, 2) other seedlings had half of their root system treated with salinity, and 3) the rest had both parts treated with salinity. Saline treatment of the whole root system caused a decline in water uptake and nitrate uptake. Nitrate reductase activity in leaves decreased due to the lower NO3 uptake, but also due to excessive chloride (Cl) accumulation in the shoot. When half of the root system was treated with salinity, water uptake was reduced in the treated part, but a compensatory increase in water uptake through the untreated part was observed. Nitrate uptake decreased slightly in the non-treated part and more strongly in the treated one, therefore, lower levels of nitrate in the shoot were obtained, compared to control plants. This lower nitrate uptake, and probably translocation to the shoot, may be the reason for the decrease in leaf NRA under these conditions.
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Claims 12
Claim · model-written summary
Whole-root salinity decreased water uptake.
- Taxon
- Tomato
Solanum lycopersicume1 - Treatment
- Saline treatment of the whole root systeme0
- Outcome
- water uptakee0
- Direction
- declinee0
- Comparator
- control solutione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Saline treatment of the whole root system caused a decline in water uptake and nitrate uptake”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
e2“control solution”
Claim · model-written summary
Whole-root salinity decreased nitrate uptake.
- Taxon
- TomatoSolanum lycopersicume1
- Treatment
- Saline treatment of the whole root systeme0
- Outcome
- nitrate uptakee0
- Direction
- declinee0
- Comparator
- control solutione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Saline treatment of the whole root system caused a decline in water uptake and nitrate uptake”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
e2“control solution”
Claim · model-written summary
Leaf nitrate reductase activity decreased with whole-root salinity.
- Taxon
- TomatoSolanum lycopersicume1
- Treatment
- Saline treatment of the whole root systeme2
- Outcome
- Nitrate reductase activity in leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity in leaves decreased due to the lower NO3 uptake, but also due to excessive chloride (Cl) accumulation in the shoot”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
e2“Saline treatment of the whole root system”
Claim · model-written summary
Lower NO3 uptake was attributed as a cause of reduced leaf nitrate reductase activity.
- Taxon
- TomatoSolanum lycopersicume1
- Outcome
- Nitrate reductase activity in leavese0
- Qualifier
- lower NO3 uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity in leaves decreased due to the lower NO3 uptake”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Excessive chloride accumulation in shoots was attributed as a cause of reduced leaf nitrate reductase activity.
- Taxon
- TomatoSolanum lycopersicume1
- Compound
- chloride (Cl)e0
- Outcome
- Nitrate reductase activity in leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity in leaves decreased due to the lower NO3 uptake, but also due to excessive chloride (Cl) accumulation in the shoot”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Salinity reduced water uptake in the treated half-root system.
- Taxon
- TomatoSolanum lycopersicume1
- Organ / stage
- root systeme0
- Treatment
- salinitye0
- Outcome
- water uptakee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When half of the root system was treated with salinity, water uptake was reduced in the treated part”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Water uptake increased compensatorily in the untreated half-root system.
- Taxon
- TomatoSolanum lycopersicume2
- Treatment
- salinitye1
- Outcome
- water uptakee0
- Direction
- increasee0
- Qualifier
- untreated parte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a compensatory increase in water uptake through the untreated part was observed”
e1“When half of the root system was treated with salinity”
e2“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Nitrate uptake decreased slightly in the untreated root half.
- Taxon
- TomatoSolanum lycopersicume2
- Treatment
- salinitye1
- Outcome
- Nitrate uptakee0
- Direction
- decreased slightlye0
- Qualifier
- non-treated parte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate uptake decreased slightly in the non-treated part and more strongly in the treated one”
e1“When half of the root system was treated with salinity”
e2“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Nitrate uptake decreased more strongly in the salinity-treated root half.
- Taxon
- TomatoSolanum lycopersicume2
- Treatment
- salinitye1
- Outcome
- Nitrate uptakee0
- Direction
- decreasede0
- Qualifier
- treated onee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate uptake decreased slightly in the non-treated part and more strongly in the treated one”
e1“When half of the root system was treated with salinity”
e2“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Shoot nitrate levels were lower after half-root salinity than in controls.
- Taxon
- TomatoSolanum lycopersicume2
- Treatment
- salinitye1
- Outcome
- levels of nitrate in the shoote0
- Direction
- lowere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower levels of nitrate in the shoot were obtained, compared to control plants”
e1“When half of the root system was treated with salinity”
e2“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Leaf nitrate reductase activity decreased under half-root salinity.
- Taxon
- TomatoSolanum lycopersicume2
- Treatment
- salinitye1
- Outcome
- leaf NRAe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease in leaf NRA under these conditions”
e1“When half of the root system was treated with salinity”
e2“Tomato (Lycopersicon esculentum Mill.) seedlings”
Claim · model-written summary
Lower nitrate uptake and possibly shoot translocation were proposed to explain lower leaf nitrate reductase activity under half-root salinity.
- Taxon
- TomatoSolanum lycopersicume1
- Outcome
- leaf NRAe0
- Qualifier
- lower nitrate uptake, and probably translocation to the shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This lower nitrate uptake, and probably translocation to the shoot, may be the reason for the decrease in leaf NRA under these conditions”
e1“Tomato (Lycopersicon esculentum Mill.) seedlings”
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See all 66 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.