Abstract
The elongation response elicited by incubating excised hypocotyl sections of lettuce (Lactuca sativa L.) in light in gibberellin (GA) can be enhanced by the addition of Cl(-), Br(-), and NO(3) (-) salts of K(+) and Na(+). Sections incubated in light in the absence of GA do not elongate in response to the addition of salts. In contrast, excised hypocotyls incubated in darkness elongate equally in both GA and water, and their elongation can also be enhanced by KCl treatment. Growth stimulation by the salts of K(+) and Na(+) occurs optimally at 10 mm and the magnitude of the response is proportional to the duration of salt treatment. Although the growth of sections incubated in light in the absence of GA is not enhanced by various salts of K(+) and Na(+), the concentration of these cations exceeds that in GA-treated sections. In dark-grown tissue, uptake of K(+) also occurs in both GA- and H(2)O-treated sections incubated in 10 mm KCl. Since increased osmotic potential resulting from cation uptake does not correlate with growth stimulation resulting from salt treatments, we conclude that increased cell turgor is not the principal driving force for growth in hypocotyl sections. Changes in the extensibility of GA-treated, light-grown tissue and dark-grown tissue incubated with and without GA correlate with the increased growth rate of these sections. Incubation of sections in KCl results only in changes in water potential of sections without having a significant effect on extensibility. When changes in water potential are accompanied by increased extensibility, however, a marked increase in growth rate is observed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 13
Claim · model-written summary
Salts enhanced GA-elicited elongation in light.
- Taxon
- lettuce
Lactuca sativae0 - Organ / stage
- hypocotyl sectionse0
- Treatment
- Cl(-), Br(-), and NO(3) (-) salts of K(+) and Na(+)e0
- Outcome
- elongation responsee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elongation response elicited by incubating excised hypocotyl sections of lettuce (Lactuca sativa L.) in light in gibberellin (GA) can be enhanced by the addition of Cl(-), Br(-), and NO(3) (-) salts of K(+) and Na(+).”
Claim · model-written summary
Salts did not elicit elongation in light without GA.
- Taxon
- lettuceLactuca sativae1
- Treatment
- addition of saltse0
- Outcome
- elongatee0
- Direction
- do not elongatee0
- Comparator
- absence of GAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sections incubated in light in the absence of GA do not elongate in response to the addition of salts.”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Dark hypocotyls elongated equally in GA and water.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excised hypocotyls incubated in darkness elongate equally in both GA and water”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
KCl enhanced dark-grown hypocotyl elongation.
- Taxon
- lettuceLactuca sativae1
- Treatment
- KCl treatmente0
- Outcome
- elongatione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their elongation can also be enhanced by KCl treatment”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Salt growth stimulation was optimal at 10 mm.
- Taxon
- lettuceLactuca sativae1
- Outcome
- Growth stimulatione0
- Direction
- optimallye0
- Value
- 10 mme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth stimulation by the salts of K(+) and Na(+) occurs optimally at 10 mm”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Salt response magnitude increased with treatment duration.
- Taxon
- lettuceLactuca sativae1
- Treatment
- duration of salt treatmente0
- Outcome
- magnitude of the responsee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the magnitude of the response is proportional to the duration of salt treatment”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Cation concentrations exceeded those in GA-treated sections despite no light-grown growth response.
- Taxon
- lettuceLactuca sativae1
- Outcome
- concentration of these cationse0
- Direction
- exceedse0
- Comparator
- GA-treated sectionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of these cations exceeds that in GA-treated sections”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Dark-grown sections took up potassium under both GA and water.
- Taxon
- lettuceLactuca sativae1
- Outcome
- uptake of K(+)e0
- Qualifier
- both GA- and H(2)O-treated sections incubated in 10 mm KCle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dark-grown tissue, uptake of K(+) also occurs in both GA- and H(2)O-treated sections incubated in 10 mm KCl.”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Cation-induced osmotic potential did not correlate with salt-stimulated growth.
- Taxon
- lettuceLactuca sativae1
- Compound
- catione0
- Outcome
- growth stimulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased osmotic potential resulting from cation uptake does not correlate with growth stimulation resulting from salt treatments”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
The authors concluded that increased turgor was not the principal growth driver.
- Taxon
- lettuceLactuca sativae1
- Outcome
- growth in hypocotyl sectionse0
- Qualifier
- increased cell turgore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased cell turgor is not the principal driving force for growth in hypocotyl sections”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Extensibility changes correlated with increased growth rate.
- Taxon
- lettuceLactuca sativae1
- Treatment
- GA-treated, light-grown tissue and dark-grown tissue incubated with and without GAe0
- Outcome
- growth ratee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in the extensibility of GA-treated, light-grown tissue and dark-grown tissue incubated with and without GA correlate with the increased growth rate of these sections.”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
KCl changed water potential without significantly changing extensibility.
- Taxon
- lettuceLactuca sativae1
- Treatment
- KCle0
- Outcome
- water potential of sectionse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incubation of sections in KCl results only in changes in water potential of sections without having a significant effect on extensibility.”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
Claim · model-written summary
Increased extensibility accompanying water-potential change produced a marked growth-rate increase.
- Taxon
- lettuceLactuca sativae1
- Organ / stage
- sectionse1
- Outcome
- growth ratee0
- Direction
- increasee0
- Qualifier
- increased extensibilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When changes in water potential are accompanied by increased extensibility, however, a marked increase in growth rate is observed.”
e1“hypocotyl sections of lettuce (Lactuca sativa L.)”
The same questions in other papers
potassium chloride · growth · Lactuca sativa (garden lettuce)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
1 paper more in this group
See all 5 papers →salinity · growth · Lactuca sativa (garden lettuce)Results differ
3 papers in the same direction as this paper · 58 in the opposite direction
- negative
- negative
- negative
58 papers more in this group
See all 62 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.