Abstract
We previously found that incorporation of PEG-8000 into the growing medium delayed germination and resulted in shorter seedlings. However, in that study, we were unable to determine whether the reduced height was merely the effect of delayed germination or of reduced elongation after germination. To answer this question, we studied whether postgermination drenches with PEG-8000 can reduce seedling height. Annual salvia ( Salvia splendens F. Sellow. ex Roem. & Shult. `Bonfire') and French marigold ( Tagetes patula L. `Boy Orange') seedlings were treated with drenches of PEG-8000: 0, 15, 20, 30, 42, 50, 62, 72, or 83 g·L –1 . At least 20% of seedlings treated with 62 to 83 g·L –1 of PEG-8000 were dead 14 d after treatment. Salvia and marigolds treated with the remaining PEG-8000 concentrations were up to 34% and 14% shorter than untreated seedlings, respectively. Leaf water (Ψ w ) and turgor potential (Ψ p ) also decreased for salvia which were grown with greater concentrations of PEG-8000, one probable cause of the observed reduction in elongation. Since the PEG-8000 in this study was applied after germination, it is clear that PEG-8000 does not reduce elongation merely by delaying germination, but also by reducing the elongation rate. Thus, postgermination drenches with PEG-8000 can be used to produce shorter seedlings.
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Claims 7
Claim · model-written summary
At least 20% of seedlings died after high-dose PEG treatment.
- Taxon
- Salvia splendens
Salvia splendense1 - Treatment
- 62 to 83 g·L –1 of PEG-8000e0
- Outcome
- deade0
- Value
- 20%e0
- Qualifier
- 14 d after treatmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At least 20% of seedlings treated with 62 to 83 g·L –1 of PEG-8000 were dead 14 d after treatment”
e1“Salvia splendens F. Sellow. ex Roem. & Shult.”
Claim · model-written summary
PEG treated salvia were up to 34% shorter than untreated seedlings.
- Treatment
- PEG-8000 concentrationse0
- Outcome
- seedlingse0
- Direction
- shortere0
- Value
- 34%e0
- Comparator
- untreated seedlingse0
SalviaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salvia and marigolds treated with the remaining PEG-8000 concentrations were up to 34% and 14% shorter than untreated seedlings, respectively”
Claim · model-written summary
PEG treated marigolds were up to 14% shorter than untreated seedlings.
- Treatment
- PEG-8000 concentrationse0
- Outcome
- seedlingse0
- Direction
- shortere0
- Value
- 14%e0
- Comparator
- untreated seedlingse0
.jpg?width=60){kind=small}
TagetesOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Salvia and marigolds treated with the remaining PEG-8000 concentrations were up to 34% and 14% shorter than untreated seedlings, respectively”
Claim · model-written summary
Increasing PEG reduced salvia leaf water potential.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf water (Ψ w ) and turgor potential (Ψ p ) also decreased for salvia which were grown with greater concentrations of PEG-8000”
Claim · model-written summary
Increasing PEG reduced salvia turgor potential.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf water (Ψ w ) and turgor potential (Ψ p ) also decreased for salvia which were grown with greater concentrations of PEG-8000”
Claim · model-written summary
Postgermination PEG reduced elongation rate.
- Taxon
- Salvia splendensSalvia splendense1
- Treatment
- PEG-8000e0
- Outcome
- elongation ratee0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PEG-8000 does not reduce elongation merely by delaying germination, but also by reducing the elongation rate”
e1“Salvia splendens F. Sellow. ex Roem. & Shult.”
Claim · model-written summary
The authors recommend postgermination PEG drenches to produce shorter seedlings.
- Taxon
- Salvia splendensSalvia splendense1
- Treatment
- postgermination drenches with PEG-8000e0
- Outcome
- produce shorter seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“postgermination drenches with PEG-8000 can be used to produce shorter seedlings”
e1“Salvia splendens F. Sellow. ex Roem. & Shult.”
The same questions in other papers
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See all 8 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.