Abstract
The role of cation and anion uptake in salt-stimulated growth of light-grown, GA(3)-treated lettuce (Lactuca sativa L.) hypocotyl sections was investigated. Potassium chloride (10 mm) causes a 2-fold increase in the growth rate of GA(3)-treated hypocotyl sections without affecting the growth rate of sections incubated in the absence of GA(3). Salt uptake is the same in both treatments, and furthermore the uptake of cation and anion is stoichiometric during the first 24 hours under all incubation conditions. The importance of the anion for cation uptake is demonstrated in experiments with benzenesulfonate(-) and iminodiacetate(2-). When K(+) and Na(+) are supplied only as the benzenesulfonate and iminodiacetate salts, growth and cation uptake are markedly reduced compared to KCl and NaCl. Calculation of the osmotic potential of salt-treated sections based on measurement of K(+) and Cl(-) uptake suggests that the observed increase in tissue osmolality is a result of salt uptake. Similarly, uptake of ions can account for the shift in water potential when sections are incubated in 10 mm KCl. We conclude that the change in growth rate of light-grown, GA(3)-treated sections caused by the addition of KCl or NaCl to the incubation medium results solely from decreased water potential of the tissue due to ion uptake.
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Claims 9
Claim · model-written summary
KCl doubled growth rate in GA(3)-treated hypocotyls.
- Taxon
- lettuce
Lactuca sativae1 - Organ / stage
- hypocotyl sectionse1
- Treatment
- Potassium chloride (10 mm)e0
- Outcome
- growth ratee0
- Direction
- increasee0
- Value
- 2-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium chloride (10 mm) causes a 2-fold increase in the growth rate of GA(3)-treated hypocotyl sections”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
KCl did not alter growth rate without GA(3).
- Taxon
- lettuceLactuca sativae2
- Treatment
- Potassium chloride (10 mm)e1
- Outcome
- growth ratee0
- Direction
- without affectinge0
- Comparator
- sections incubated in the absence of GA(3)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“without affecting the growth rate of sections incubated in the absence of GA(3)”
e1“Potassium chloride (10 mm)”
e2“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
Salt uptake was the same with and without GA(3).
- Taxon
- lettuceLactuca sativae3
- Treatment
- GA(3)-treatede1
- Outcome
- Salt uptakee0
- Direction
- samee0
- Comparator
- absence of GA(3)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt uptake is the same in both treatments”
e1“light-grown, GA(3)-treated lettuce”
e2“absence of GA(3)”
e3“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
Cation and anion uptake were stoichiometric during the first 24 hours.
- Taxon
- lettuceLactuca sativae1
- Outcome
- uptake of cation and anion is stoichiometrice0
- Qualifier
- during the first 24 hourse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uptake of cation and anion is stoichiometric during the first 24 hours under all incubation conditions”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
Benzenesulfonate and iminodiacetate salts markedly reduced growth compared with chloride salts.
- Taxon
- lettuceLactuca sativae1
- Treatment
- benzenesulfonate and iminodiacetate saltse0
- Outcome
- growthe0
- Direction
- reducede0
- Comparator
- KCl and NaCle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When K(+) and Na(+) are supplied only as the benzenesulfonate and iminodiacetate salts, growth and cation uptake are markedly reduced compared to KCl and NaCl”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
The same salts markedly reduced cation uptake.
- Taxon
- lettuceLactuca sativae1
- Treatment
- benzenesulfonate and iminodiacetate saltse0
- Outcome
- cation uptakee0
- Direction
- reducede0
- Comparator
- KCl and NaCle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When K(+) and Na(+) are supplied only as the benzenesulfonate and iminodiacetate salts, growth and cation uptake are markedly reduced compared to KCl and NaCl”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
Salt uptake accounted for increased tissue osmolality.
- Taxon
- lettuceLactuca sativae1
- Outcome
- increase in tissue osmolalitye0
- Qualifier
- salt uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“observed increase in tissue osmolality is a result of salt uptake”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
Ion uptake accounted for the water-potential shift under 10 mm KCl.
- Taxon
- lettuceLactuca sativae1
- Treatment
- 10 mm KCle0
- Outcome
- shift in water potentiale0
- Qualifier
- uptake of ionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uptake of ions can account for the shift in water potential when sections are incubated in 10 mm KCl”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
Claim · model-written summary
KCl or NaCl increased growth through ion-uptake-driven reduction in tissue water potential.
- Taxon
- lettuceLactuca sativae1
- Treatment
- addition of KCl or NaCle0
- Outcome
- change in growth ratee0
- Qualifier
- decreased water potential of the tissue due to ion uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“change in growth rate of light-grown, GA(3)-treated sections caused by the addition of KCl or NaCl to the incubation medium results solely from decreased water potential of the tissue due to ion uptake”
e1“lettuce (Lactuca sativa L.) hypocotyl sections”
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See all 5 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.