Abstract
Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene is similar to the action of the gas in other hormonal systems. Ethylene was more active than propylene and ethane was inactive. An inhibitor of ethylene production, aminoethoxy-vinylglycine, reduced ethylene evolution and germination. Inhibitors of ethylene action such as, 5-methyl-7-chloro-4-ethoxycarbonylmethoxy-2,1,3-benzothiadiazole, 2,5-norbornadiene, and silver thiosulfate inhibited germination and the effect was reversed by the addition of ethylene to the gas phase. The action of ethylene appears to be due to the promotion of radial cell expansion in the embryonic hypocotyl. The action of N6-benzyladenine and fusiccocin, which also overcome thermoinhibition, appears to be due to a promotion of hypocotyl elongation. None of the germination promoters studied appeared to function by lowering the mechanical resistance of the endosperm to embryonic growth. Data presented here are consistent with the view that ethylene plays a role in lettuce seed germination under thermoinhibited and normal conditions.
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Claims 8
Claim · model-written summary
Ethylene promoted thermoinhibited lettuce germination.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- ethylenee0
- Outcome
- seed germinatione0
- Direction
- Promotione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
Ethylene was more active than propylene.
- Taxon
- lettuceLactuca sativae1
- Treatment
- Ethylenee0
- Outcome
- more activee0
- Direction
- more activee0
- Comparator
- propylenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene was more active than propylene”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
Ethane was inactive in promoting germination.
- Taxon
- lettuceLactuca sativae1
- Treatment
- ethanee0
- Outcome
- inactivee0
- Direction
- inactivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethane was inactive”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
Aminoethoxy-vinylglycine reduced ethylene evolution and germination.
- Taxon
- lettuceLactuca sativae1
- Treatment
- aminoethoxy-vinylglycinee0
- Outcome
- ethylene evolution and germinatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aminoethoxy-vinylglycine, reduced ethylene evolution and germination”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
Ethylene-action inhibitors inhibited germination, and added ethylene reversed the inhibition.
- Taxon
- lettuceLactuca sativae1
- Treatment
- Inhibitors of ethylene actione0
- Outcome
- germinatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibitors of ethylene action such as, 5-methyl-7-chloro-4-ethoxycarbonylmethoxy-2,1,3-benzothiadiazole, 2,5-norbornadiene, and silver thiosulfate inhibited germination and the effect was reversed by the addition of ethylene to the gas phase”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
Ethylene appeared to promote radial expansion of embryonic hypocotyl cells.
- Taxon
- lettuceLactuca sativae1
- Treatment
- ethylenee0
- Outcome
- radial cell expansion in the embryonic hypocotyle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The action of ethylene appears to be due to the promotion of radial cell expansion in the embryonic hypocotyl”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
N6-benzyladenine and fusiccocin appeared to overcome thermoinhibition through hypocotyl elongation.
- Taxon
- lettuceLactuca sativae1
- Treatment
- N6-benzyladenine and fusiccocine0
- Outcome
- promotion of hypocotyl elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The action of N6-benzyladenine and fusiccocin, which also overcome thermoinhibition, appears to be due to a promotion of hypocotyl elongation”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
Claim · model-written summary
None of the germination promoters appeared to reduce endosperm mechanical resistance.
- Taxon
- lettuceLactuca sativae1
- Treatment
- germination promoterse0
- Outcome
- mechanical resistance of the endosperm to embryonic growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the germination promoters studied appeared to function by lowering the mechanical resistance of the endosperm to embryonic growth”
e1“Promotion of thermoinhibited (30 degrees C) lettuce (Lactuca sativa cv ;Grand Rapids') seed germination by ethylene”
The same questions in other papers
ethene · growth · Lactuca sativa (garden lettuce)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 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.