Abstract
The leaf blade of cotton (Gossypium hirsutum L. cv. Stoneville 213) was investigated as the initial site of ethylene action in abscission. Ethylene applied at 14 mul/l to intact 3-week-old plants caused abscission of the third true leaf within 3 days. However, keeping only the leaf blade of this leaf in air during ethylene treatment of the rest of the plant completely prevented its abscission for up to 7 days. This inhibition of abscission was apparently the result of continued auxin production in the blade since (a) the application of an auxin transport inhibitor to the petiole of the air-treated leaf blade restored ethylene sensitivity to the leaf in terms of abscission; (b) repeated applications of naphthaleneacetic acid to the leaf blade of the third true leaf, when the entire plant was exposed to ethylene, had the same preventive effect on abscission of this leaf as keeping its leaf blade in air; and (c) the inhibitory effect of ethylene on auxin transport in the petiole, which is reduced by auxin treatment, was also reduced by placing the leaf blade in air.The reverse treatment of exposing only the leaf blade of the third true leaf to 14 mul/l of ethylene, while the rest of the plant was kept in air, also did not cause abscission for up to 5 days. Auxin transport in the petioles of these leaves, however, was inhibited over 80% within 2 days and this effect presumably accounted for their increased sensitivity to ethylene during the subsequent exposures of the whole leaf to the gas.These results suggest that an initial and essential function of applied ethylene in abscission is to reduce the amount of auxin transported out of the leaf blade. This reduction together with the inhibitory effect of ethylene on auxin transport in the petiole reduces the auxin level at the abscission zone to a point where the cells in this region become responsive to the more direct action of the gas (e.g., enzyme induction and secretion). This sequence of events accounts for the lack of abscission unless ethylene is applied to both the leaf blade and the abscission zone.
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Claims 11
Claim · model-written summary
Ethylene caused abscission of the third true cotton leaf within 3 days.
- Taxon
- cotton
Gossypium hirsutumt0 - Organ / stage
- third true leafe0
- Treatment
- Ethylene applied at 14 mul/le0
- Outcome
- abscission of the third true leafe0
- Value
- within 3 dayse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene applied at 14 mul/l to intact 3-week-old plants caused abscission of the third true leaf within 3 days”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Keeping only the blade in air prevented abscission during ethylene treatment of the rest of the cotton plant for up to 7 days.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- leaf bladee0
- Treatment
- keeping only the leaf blade of this leaf in aire0
- Outcome
- abscissione0
- Direction
- preventede0
- Value
- up to 7 dayse0
- Comparator
- ethylene treatment of the rest of the plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“keeping only the leaf blade of this leaf in air during ethylene treatment of the rest of the plant completely prevented its abscission for up to 7 days”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
An auxin transport inhibitor on the petiole restored ethylene sensitivity for abscission.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- petiolee0
- Treatment
- application of an auxin transport inhibitore0
- Outcome
- ethylene sensitivity to the leaf in terms of abscissione0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of an auxin transport inhibitor to the petiole of the air-treated leaf blade restored ethylene sensitivity to the leaf in terms of abscission”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Repeated naphthaleneacetic acid application to the leaf blade prevented abscission during whole-plant ethylene exposure.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- repeated applications of naphthaleneacetic acide0
- Outcome
- abscission of this leafe0
- Direction
- preventivee0
- Comparator
- keeping its leaf blade in aire0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“repeated applications of naphthaleneacetic acid to the leaf blade of the third true leaf, when the entire plant was exposed to ethylene, had the same preventive effect on abscission of this leaf as keeping its leaf blade in air”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Auxin treatment reduced the inhibitory effect of ethylene on petiole auxin transport.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- auxin treatmente0
- Outcome
- inhibitory effect of ethylene on auxin transport in the petiolee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibitory effect of ethylene on auxin transport in the petiole, which is reduced by auxin treatment”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Placing the blade in air reduced the inhibitory effect of ethylene on petiole auxin transport.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- placing the leaf blade in aire0
- Outcome
- inhibitory effect of ethylene on auxin transport in the petiolee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibitory effect of ethylene on auxin transport in the petiole, which is reduced by auxin treatment, was also reduced by placing the leaf blade in air”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Exposing only the leaf blade to ethylene did not cause abscission for up to 5 days.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- exposing only the leaf blade of the third true leaf to 14 mul/l of ethylenee0
- Outcome
- abscissione0
- Value
- up to 5 dayse0
- Comparator
- rest of the plant was kept in aire0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposing only the leaf blade of the third true leaf to 14 mul/l of ethylene, while the rest of the plant was kept in air, also did not cause abscission for up to 5 days”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Blade-only ethylene exposure inhibited petiole auxin transport by over 80% within 2 days.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Ethylene applied at 14 mul/le1
- Outcome
- Auxin transport in the petiolese0
- Direction
- inhibitede0
- Value
- over 80%e0
- Qualifier
- within 2 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Auxin transport in the petioles of these leaves, however, was inhibited over 80% within 2 days”
e1“Ethylene applied at 14 mul/l to intact 3-week-old plants caused abscission of the third true leaf within 3 days”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
Blade-only ethylene exposure increased sensitivity to subsequent whole-leaf ethylene treatment.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ethylenee0
- Outcome
- sensitivity to ethylenee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect presumably accounted for their increased sensitivity to ethylene during the subsequent exposures of the whole leaf to the gas”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
The authors propose that applied ethylene initially reduces auxin export from the leaf blade during abscission.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- applied ethylenee0
- Outcome
- amount of auxin transported out of the leaf bladee0
- Direction
- reducee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an initial and essential function of applied ethylene in abscission is to reduce the amount of auxin transported out of the leaf blade”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
Claim · model-written summary
The authors propose that reduced auxin at the abscission zone makes its cells responsive to ethylene.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- abscission zonee0
- Outcome
- cells in this region become responsive to the more direct action of the gase0
- Qualifier
- reduces the auxin levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduces the auxin level at the abscission zone to a point where the cells in this region become responsive to the more direct action of the gas”
t0“cotton (Gossypium hirsutum L. cv. Stoneville 213)”
The same questions in other papers
ethene · yield · Gossypium hirsutum (cotton)Positive and negative results
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See all 8 papers →1-naphthaleneacetic acid · yield · Gossypium hirsutum (cotton)Results agree
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2 papers in the same direction as this paper
- positive
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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.