Abstract
Wheat leaves normally produced very little ethylene, but following a water deficit stress which caused a loss of 9% initial fresh weight, ethylene production increased more than 30-fold within 4 hours and declined rapidly thereafter. The changes in ethylene production were paralleled by an increase and subsequent decrease in 1-aminocyclopropanecarboxylic acid (ACC) content. The level of S-adenosylmethionine was unaffected, suggesting that the conversion of S-adenosylmethionine to ACC is a key reaction in the production of water stress-induced ethylene. This view was further supported by the observation that application of ACC to nonstressed leaf tissue caused a 70-fold increase in ethylene production, while aminoethoxyvinylglycine, a known inhibitor of the conversion of S-adenosylmethionine to ACC, inhibited ACC accumulation as well as the surge in ethylene production if the inhibitor was applied prior to the stress treatment. Cycloheximide, an inhibitor of protein synthesis, effectively blocked both ethylene production and ACC formation, suggesting that water stress induces de novo synthesis of ACC synthase, which is the rate-controlling enzyme in the pathway of ethylene biosynthesis.
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Claims 9
Claim · model-written summary
Water deficit increased wheat leaf ethylene production more than 30 fold within four hours.
- Taxon
- Wheat
Triticum aestivume1 - Organ / stage
- leavese0
- Treatment
- water deficit stresse2
- Outcome
- ethylene productione0
- Direction
- increasede0
- Value
- more than 30-folde0
- Qualifier
- within 4 hourse0
- Comparator
- normallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat leaves normally produced very little ethylene, but following a water deficit stress which caused a loss of 9% initial fresh weight, ethylene production increased more than 30-fold within 4 hours”
e1“Wheat leaves normally produced very little ethylene”
e2“water deficit stress which caused a loss of 9% initial fresh weight”
Claim · model-written summary
Wheat leaf ethylene production declined rapidly thereafter.
- Taxon
- WheatTriticum aestivume1
- Outcome
- ethylene productione0
- Direction
- declined rapidly thereaftere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethylene production increased more than 30-fold within 4 hours and declined rapidly thereafter”
e1“Wheat leaves normally produced very little ethylene”
Claim · model-written summary
Wheat leaf ACC content increased and subsequently decreased in parallel with ethylene production.
- Taxon
- WheatTriticum aestivume1
- Compound
- ethylenee0
- Outcome
- 1-aminocyclopropanecarboxylic acid (ACC) contente0
- Direction
- increase and subsequent decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The changes in ethylene production were paralleled by an increase and subsequent decrease in 1-aminocyclopropanecarboxylic acid (ACC) content.”
e1“Wheat leaves normally produced very little ethylene”
Claim · model-written summary
Wheat leaf S-adenosylmethionine level was unaffected by water stress.
- Taxon
- WheatTriticum aestivume1
- Treatment
- water deficit stresse2
- Outcome
- level of S-adenosylmethioninee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The level of S-adenosylmethionine was unaffected”
e1“Wheat leaves normally produced very little ethylene”
e2“water deficit stress which caused a loss of 9% initial fresh weight”
Claim · model-written summary
Applying ACC to unstressed wheat leaves increased ethylene production 70 fold.
- Taxon
- WheatTriticum aestivume1
- Treatment
- application of ACCe0
- Outcome
- ethylene productione0
- Direction
- increasee0
- Value
- 70-folde0
- Comparator
- nonstressed leaf tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of ACC to nonstressed leaf tissue caused a 70-fold increase in ethylene production”
e1“Wheat leaves normally produced very little ethylene”
Claim · model-written summary
Aminoethoxyvinylglycine inhibited ACC accumulation under water stress when applied before stress.
- Taxon
- WheatTriticum aestivume1
- Treatment
- aminoethoxyvinylglycinee0
- Outcome
- ACC accumulatione0
- Direction
- inhibitede0
- Qualifier
- if the inhibitor was applied prior to the stress treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aminoethoxyvinylglycine, a known inhibitor of the conversion of S-adenosylmethionine to ACC, inhibited ACC accumulation as well as the surge in ethylene production if the inhibitor was applied prior to the stress treatment”
e1“Wheat leaves normally produced very little ethylene”
Claim · model-written summary
Aminoethoxyvinylglycine inhibited the ethylene surge under water stress when applied before stress.
- Taxon
- WheatTriticum aestivume1
- Treatment
- aminoethoxyvinylglycinee0
- Outcome
- surge in ethylene productione0
- Direction
- inhibitede0
- Qualifier
- if the inhibitor was applied prior to the stress treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aminoethoxyvinylglycine, a known inhibitor of the conversion of S-adenosylmethionine to ACC, inhibited ACC accumulation as well as the surge in ethylene production if the inhibitor was applied prior to the stress treatment”
e1“Wheat leaves normally produced very little ethylene”
Claim · model-written summary
Cycloheximide blocked wheat ethylene production.
- Taxon
- WheatTriticum aestivume1
- Treatment
- Cycloheximidee0
- Outcome
- ethylene productione0
- Direction
- blockede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cycloheximide, an inhibitor of protein synthesis, effectively blocked both ethylene production and ACC formation”
e1“Wheat leaves normally produced very little ethylene”
Claim · model-written summary
Cycloheximide blocked wheat ACC formation.
- Taxon
- WheatTriticum aestivume1
- Treatment
- Cycloheximidee0
- Outcome
- ACC formatione0
- Direction
- blockede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cycloheximide, an inhibitor of protein synthesis, effectively blocked both ethylene production and ACC formation”
e1“Wheat leaves normally produced very little ethylene”
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