Abstract
Ethylene and supraoptimal levels of 2,4-dichlorophenoxyacetic acid inhibit the growth of the apical hook region of etiolated Pisum sativum (var. Alaska) seedlings by stopping almost all cell divisions. Cells are prevented from entering prophase. The hormones also retard cell division in intact root tips and completely stop the process in lateral buds. The latter inhibition is reversed partially by benzyl adenine. In root tips and the stem plumular and subhook regions, ethylene inhibits DNA synthesis. The magnitude of this inhibition is correlated with the degree of repression of cell division in meristematic tissue, suggesting that the effect on cell division results from a lack of DNA synthesis. Ethylene inhibits cell division within a few hours with a dose-response curve similar to that for most other actions of the gas. Experiments with seedlings grown under hypobaric conditions suggest that the gas naturally controls plumular expansion and cell division in the apical region.
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Claims 11
Claim · model-written summary
Ethylene inhibited apical hook growth by stopping almost all cell divisions.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Material
- var. Alaskae0
- Organ / stage
- apical hook regione0
- Treatment
- Ethylenee0
- Outcome
- growthe0
- Direction
- inhibite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene and supraoptimal levels of 2,4-dichlorophenoxyacetic acid inhibit the growth of the apical hook region of etiolated Pisum sativum (var. Alaska) seedlings by stopping almost all cell divisions.”
Claim · model-written summary
Supraoptimal 2,4-dichlorophenoxyacetic acid inhibited apical hook growth.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- apical hook regione0
- Treatment
- supraoptimal levels of 2,4-dichlorophenoxyacetic acide0
- Outcome
- growthe0
- Direction
- inhibite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene and supraoptimal levels of 2,4-dichlorophenoxyacetic acid inhibit the growth of the apical hook region of etiolated Pisum sativum (var. Alaska) seedlings by stopping almost all cell divisions.”
Claim · model-written summary
Hormone treatment prevented cells from entering prophase.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- Ethylenet0
- Outcome
- entering prophasee0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cells are prevented from entering prophase.”
t0“Ethylene on Cell Division and Deoxyribonucleic Acid Synthesis in Pisum sativum”
Claim · model-written summary
The hormones retarded cell division in root tips.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- intact root tipse0
- Treatment
- hormonese0
- Outcome
- cell divisione0
- Direction
- retarde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hormones also retard cell division in intact root tips”
t0“Pisum sativum”
Claim · model-written summary
The hormones stopped cell division in lateral buds.
- Taxon
- Pisum sativumLathyrus oleraceust1
- Organ / stage
- lateral budse0
- Treatment
- Ethylenet0
- Outcome
- cell divisiont1
- Direction
- stope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“completely stop the process in lateral buds.”
t0“Ethylene”
t1“Cell Division and Deoxyribonucleic Acid Synthesis in Pisum sativum”
Claim · model-written summary
Benzyl adenine partially reversed inhibition in lateral buds.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- benzyl adeninee0
- Outcome
- inhibitione0
- Direction
- reversed partiallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The latter inhibition is reversed partially by benzyl adenine.”
t0“Pisum sativum”
Claim · model-written summary
Ethylene inhibited DNA synthesis in root tips, plumular and subhook regions.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- root tips and the stem plumular and subhook regionse0
- Treatment
- ethylenee0
- Outcome
- DNA synthesise0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In root tips and the stem plumular and subhook regions, ethylene inhibits DNA synthesis.”
t0“Pisum sativum”
Claim · model-written summary
DNA synthesis inhibition correlated with repression of meristematic cell division.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- meristematic tissuee0
- Outcome
- repression of cell divisione0
- Qualifier
- magnitude of this inhibitione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The magnitude of this inhibition is correlated with the degree of repression of cell division in meristematic tissue”
t0“Pisum sativum”
Claim · model-written summary
The authors suggest that reduced DNA synthesis causes reduced cell division.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- effect on cell divisione0
- Qualifier
- lack of DNA synthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that the effect on cell division results from a lack of DNA synthesis.”
t0“Pisum sativum”
Claim · model-written summary
Ethylene inhibited cell division within a few hours with a similar dose response to other gas actions.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- Ethylenee0
- Outcome
- cell divisione0
- Direction
- inhibitse0
- Qualifier
- within a few hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene inhibits cell division within a few hours with a dose-response curve similar to that for most other actions of the gas.”
t0“Pisum sativum”
Claim · model-written summary
Hypobaric experiments suggest ethylene naturally controls plumular expansion and apical cell division.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- plumular expansion and cell divisione0
- Qualifier
- under hypobaric conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments with seedlings grown under hypobaric conditions suggest that the gas naturally controls plumular expansion and cell division in the apical region.”
t0“Pisum sativum”
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