Abstract
EPTC ( S -ethyl dipropylthiocarbamate) reduces hypocotyl growth of lettuce [ Lactuca sativa (L.) ‘Grand Rapids’] seedlings in response to gibberellic acid (GA 3 ) in the lettuce hypocotyl bioassay. Doses of 0.01, 0.1, and 1.0 mM EPTC were effective over a range of gibberellin concentrations. Significant reductions in hypocotyl growth in response to all doses of EPTC and GA 3 at 7.68 μg/ml occurred between 12 and 24 h after initial treatment. In a 72-h experiment, pulse treatments of EPTC at 0.01, 0.1, and 1.0 mM plus GA 3 at 7.68 μg/ml for only 1 or 2 h at the beginning reduced the subsequent response of the bioassay when plants were transferred to GA 3 alone for the remaining 71 or 70 h, respectively. Final hypocotyl growth in GA 3 at 7.68 μg/ml was reduced by exposure to EPTC at 0.01, 0.1 and 1.0 mM plus GA 3 at any time during the entire 72 h test period. The interaction between EPTC and GA 3 was not due to herbicide-induced precipitation nor decomposition of GA 3 in the medium. This was demonstrated by separation of [ 14 C]-GA 3 in four thin-layer chromatography solvent systems after incubation in the presence or absence of 1.0 mM EPTC for 48 h. Apparently EPTC can reduce the growth response of sensitive species to exogenous gibberellins in addition to its effects on endogenous gibberellin-like substances or gibberellin biosynthesis.
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Claims 7
Claim · model-written summary
EPTC reduces hypocotyl growth of lettuce seedlings in response to gibberellic acid.
- Taxon
- Lactuca sativa
Lactuca sativat0 - Treatment
- EPTCe1
- Compound
- gibberellic acide1
- Outcome
- hypocotyl growthe1
- Direction
- reducese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e1“EPTC ( S -ethyl dipropylthiocarbamate) reduces hypocotyl growth of lettuce [ Lactuca sativa (L.) ‘Grand Rapids’] seedlings in response to gibberellic acid (GA 3 )”
Claim · model-written summary
Doses of 0.01, 0.1, and 1.0 mM EPTC were effective over a range of gibberellin concentrations.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- Doses of 0.01, 0.1, and 1.0 mM EPTCe2
- Outcome
- effectivee2
- Direction
- effectivee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e2“Doses of 0.01, 0.1, and 1.0 mM EPTC were effective over a range of gibberellin concentrations”
Claim · model-written summary
Significant reductions in lettuce hypocotyl growth in response to all doses of EPTC and GA3 at 7.68 μg/ml occurred between 12 and 24 h after initial treatment.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- all doses of EPTC and GA 3 at 7.68 μg/mle3
- Outcome
- hypocotyl growthe3
- Direction
- reductionse3
- Qualifier
- between 12 and 24 h after initial treatmente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e3“Significant reductions in hypocotyl growth in response to all doses of EPTC and GA 3 at 7.68 μg/ml occurred between 12 and 24 h after initial treatment”
Claim · model-written summary
In a 72-h experiment, pulse treatments of EPTC plus GA3 for only 1 or 2 h reduced the subsequent response of the bioassay when plants were transferred to GA3 alone.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- pulse treatments of EPTC at 0.01, 0.1, and 1.0 mM plus GA 3 at 7.68 μg/ml for only 1 or 2 he4
- Outcome
- subsequent response of the bioassaye4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e4“In a 72-h experiment, pulse treatments of EPTC at 0.01, 0.1, and 1.0 mM plus GA 3 at 7.68 μg/ml for only 1 or 2 h at the beginning reduced the subsequent response of the bioassay when plants were transferred to GA 3 alone for the remaining 71 or 70 h, respectively”
Claim · model-written summary
Final hypocotyl growth in GA3 at 7.68 μg/ml was reduced by exposure to EPTC at 0.01, 0.1 and 1.0 mM plus GA3 at any time during the 72 h test period.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- exposure to EPTC at 0.01, 0.1 and 1.0 mMe5
- Outcome
- Final hypocotyl growthe5
- Direction
- reducede5
- Qualifier
- at any time during the entire 72 h test periode5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e5“Final hypocotyl growth in GA 3 at 7.68 μg/ml was reduced by exposure to EPTC at 0.01, 0.1 and 1.0 mM plus GA 3 at any time during the entire 72 h test period”
Claim · model-written summary
The EPTC and GA3 interaction was not due to herbicide-induced precipitation or to decomposition of GA3 in the medium.
- Taxon
- Lactuca sativaLactuca sativat0
- Compound
- GA 3e6
- Outcome
- The interaction between EPTC and GA 3e6
- Qualifier
- not due to herbicide-induced precipitation nor decomposition of GA 3 in the mediume6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e6“The interaction between EPTC and GA 3 was not due to herbicide-induced precipitation nor decomposition of GA 3 in the medium”
Claim · model-written summary
EPTC can reduce the growth response of sensitive species to exogenous gibberellins beyond its effects on endogenous gibberellin-like substances or gibberellin biosynthesis.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- EPTCe7
- Outcome
- growth responsee7
- Direction
- reducee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa) Hypocotyl Bioassay”
e7“EPTC can reduce the growth response of sensitive species to exogenous gibberellins in addition to its effects on endogenous gibberellin-like substances or gibberellin biosynthesis”
The same questions in other papers
Gibberellic acid · growth · Lactuca sativa (garden lettuce)Results differ
8 papers in the same direction as this paper · 36 in the opposite direction
- positive
- positive
- positive
41 papers more in this group
See all 45 papers →EPTC · growth · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- negative
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.