Abstract
The effect of three gibberellin synergists on lettuce hypocotyl elongation was studied. Dihydroconiferyl alcohol isolated from lettuce plants and (−)-(6S, 1′S)-pestalotin isolated from Pestalotia cryptomeriaecola enhanced the promoting effect of gibberellic acid on hypocotyl elongation of lettuce seedlings with and without the cotyledons. On the other hand, TA, a triazinone compound, did not enhance the gibberellin effect. The action of (−)-(6S, 1′S)-pestalotin was strongly inhibited by competitive inhibitors of dihydroconiferyl alcohol such as caffeic, ferulic and trans-cinnamic acids. Of the two stereoisomers of pestalotin, (+)-(6R, 1′R)-pestalotin enhanced the gibberellin effect but (+)-(6R, 1′S)-epipestalotin did not. (+)-(6R, 1′S)-Epipestalotin strongly inhibited the action of (−)-(6S, 1′S)-pestalotin and dihydroconiferyl alcohol. TA did not affect the action of dihydroconiferyl alcohol. Stress-relaxation analysis of the mechanical properties of the lettuce hypocotyl cell wall demonstrated that gibberellic acid caused cell wall loosening and dihydroconiferyl alcohol and pestalotin did not influence this gibberellin effect. The action mechanism of gibberellin synergists is discussed based on these results.
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Claims 10
Claim · model-written summary
Dihydroconiferyl alcohol enhanced the promoting effect of gibberellic acid on lettuce hypocotyl elongation, with and without cotyledons.
- Taxon
- lettuce
Lactuca sativat0 - Organ / stage
- hypocotylt0
- Treatment
- gibberellic acide0
- Compound
- Dihydroconiferyl alcohole0
- Outcome
- hypocotyl elongatione0
- Direction
- enhancede0
- Qualifier
- with and without the cotyledonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e0“Dihydroconiferyl alcohol isolated from lettuce plants and (−)-(6S, 1′S)-pestalotin isolated from Pestalotia cryptomeriaecola enhanced the promoting effect of gibberellic acid on hypocotyl elongation of lettuce seedlings with and without the cotyledons”
Claim · model-written summary
(−)-(6S, 1′S)-pestalotin enhanced the promoting effect of gibberellic acid on lettuce hypocotyl elongation, with and without cotyledons.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- gibberellic acide0
- Compound
- (−)-(6S, 1′S)-pestalotine0
- Outcome
- hypocotyl elongatione0
- Direction
- enhancede0
- Qualifier
- with and without the cotyledonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e0“Dihydroconiferyl alcohol isolated from lettuce plants and (−)-(6S, 1′S)-pestalotin isolated from Pestalotia cryptomeriaecola enhanced the promoting effect of gibberellic acid on hypocotyl elongation of lettuce seedlings with and without the cotyledons”
Claim · model-written summary
TA, a triazinone compound, did not enhance the gibberellin effect on lettuce hypocotyl elongation.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- TA, a triazinone compounde1
- Compound
- TAe1
- Outcome
- gibberellin effecte1
- Direction
- did not enhancee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e1“TA, a triazinone compound, did not enhance the gibberellin effect”
Claim · model-written summary
(+)-(6R, 1′R)-pestalotin enhanced the gibberellin effect on lettuce hypocotyl elongation.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- (+)-(6R, 1′R)-pestalotine2
- Compound
- (+)-(6R, 1′R)-pestalotine2
- Outcome
- gibberellin effecte2
- Direction
- enhancede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e2“Of the two stereoisomers of pestalotin, (+)-(6R, 1′R)-pestalotin enhanced the gibberellin effect but (+)-(6R, 1′S)-epipestalotin did not”
Claim · model-written summary
(+)-(6R, 1′S)-epipestalotin did not enhance the gibberellin effect on lettuce hypocotyl elongation.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- (+)-(6R, 1′S)-epipestalotine2
- Compound
- (+)-(6R, 1′S)-epipestalotine2
- Outcome
- gibberellin effecte2
- Direction
- did note2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e2“Of the two stereoisomers of pestalotin, (+)-(6R, 1′R)-pestalotin enhanced the gibberellin effect but (+)-(6R, 1′S)-epipestalotin did not”
Claim · model-written summary
(+)-(6R, 1′S)-epipestalotin strongly inhibited the action of (−)-(6S, 1′S)-pestalotin on lettuce hypocotyl elongation.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- (+)-(6R, 1′S)-Epipestalotine3
- Compound
- (+)-(6R, 1′S)-Epipestalotine3
- Outcome
- action of (−)-(6S, 1′S)-pestalotine3
- Direction
- strongly inhibitede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e3“(+)-(6R, 1′S)-Epipestalotin strongly inhibited the action of (−)-(6S, 1′S)-pestalotin and dihydroconiferyl alcohol”
Claim · model-written summary
TA did not affect the action of dihydroconiferyl alcohol on lettuce hypocotyl elongation.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- TAe4
- Compound
- TAe4
- Outcome
- action of dihydroconiferyl alcohole4
- Direction
- did not affecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e4“TA did not affect the action of dihydroconiferyl alcohol”
Claim · model-written summary
Gibberellic acid caused cell wall loosening in lettuce hypocotyl.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotyl cell walle5
- Treatment
- gibberellic acide5
- Outcome
- cell wall looseninge5
- Direction
- causede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e5“Stress-relaxation analysis of the mechanical properties of the lettuce hypocotyl cell wall demonstrated that gibberellic acid caused cell wall loosening”
Claim · model-written summary
Dihydroconiferyl alcohol did not influence the gibberellin effect on cell wall loosening.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- dihydroconiferyl alcohole6
- Compound
- dihydroconiferyl alcohole6
- Outcome
- this gibberellin effecte6
- Direction
- did not influencee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e6“dihydroconiferyl alcohol and pestalotin did not influence this gibberellin effect”
Claim · model-written summary
Pestalotin did not influence the gibberellin effect on cell wall loosening.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- hypocotylt0
- Treatment
- pestalotine6
- Compound
- pestalotine6
- Outcome
- this gibberellin effecte6
- Direction
- did not influencee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Regulation of lettuce hypocotyl elongation by gibberellic acid”
e6“dihydroconiferyl alcohol and pestalotin did not influence this gibberellin effect”
The same questions in other papers
Gibberellic acid · growth · Lactuca sativa (garden lettuce)Results differ
35 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
41 papers more in this group
See all 45 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.