Abstract
Co(2+) promoted elongation of hypocotyl segments of light-grown cucumber (Cucumis sativus) seedlings. Time course and dose response data are presented and interactions with IAA, gibberellin, cyclohexanol, and cotyledons described. Segments without cotyledons responded to Co(2+) only if grown in gas-tight vessels with IAA added. When bases of cotyledons were ringed with an inhibitor of auxin transport, Co(2+) caused no growth promotion in the hypocotyl. Co(2+) prevented lateral swelling of hypocotyls treated with supraoptimal IAA. Removal of ethylene from the atmosphere reduced the Co(2+) response, but Co(2+) did not counteract the inhibitory effect of increased ethylene levels. These results are consistent with the hypothesis that Co(2+) promotes hypocotyl elongation by inhibiting ethylene production. The hypothesis was confirmed by a direct demonstration that Co(2+), at growth-promoting concentrations, powerfully inhibited ethylene production in the cucumber hypocotyl.
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Claims 7
Claim · model-written summary
Co(2+) promoted elongation of light-grown cucumber hypocotyl segments.
- Taxon
- cucumber (Cucumis sativus)
Cucumis sativuse0 - Organ / stage
- hypocotyl segmentse0
- Treatment
- Co(2+)e0
- Outcome
- elongation of hypocotyl segmentse0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co(2+) promoted elongation of hypocotyl segments of light-grown cucumber (Cucumis sativus) seedlings.”
Claim · model-written summary
Without cotyledons, segments responded to Co(2+) only in gas-tight vessels with IAA.
- Taxon
- cucumber (Cucumis sativus)Cucumis sativuse1
- Organ / stage
- Segments without cotyledonse0
- Treatment
- Co(2+)e0
- Outcome
- responded to Co(2+)e0
- Qualifier
- gas-tight vessels with IAA addede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Segments without cotyledons responded to Co(2+) only if grown in gas-tight vessels with IAA added.”
e1“light-grown cucumber (Cucumis sativus) seedlings”
Claim · model-written summary
Blocking auxin transport at cotyledon bases eliminated Co(2+) growth promotion.
- Taxon
- cucumber (Cucumis sativus)Cucumis sativuse1
- Organ / stage
- hypocotyle0
- Treatment
- ringed with an inhibitor of auxin transporte0
- Outcome
- growth promotion in the hypocotyle0
- Direction
- no growth promotione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When bases of cotyledons were ringed with an inhibitor of auxin transport, Co(2+) caused no growth promotion in the hypocotyl.”
e1“light-grown cucumber (Cucumis sativus) seedlings”
Claim · model-written summary
Co(2+) prevented lateral swelling from supraoptimal IAA.
- Taxon
- cucumber (Cucumis sativus)Cucumis sativuse1
- Treatment
- Co(2+)e0
- Outcome
- lateral swelling of hypocotylse0
- Direction
- preventede0
- Qualifier
- treated with supraoptimal IAAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co(2+) prevented lateral swelling of hypocotyls treated with supraoptimal IAA.”
e1“light-grown cucumber (Cucumis sativus) seedlings”
Claim · model-written summary
Removing ethylene reduced the Co(2+) response.
- Taxon
- cucumber (Cucumis sativus)Cucumis sativuse1
- Treatment
- Removal of ethylene from the atmospheree0
- Outcome
- Co(2+) responsee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removal of ethylene from the atmosphere reduced the Co(2+) response”
e1“light-grown cucumber (Cucumis sativus) seedlings”
Claim · model-written summary
Co(2+) did not counteract inhibition by increased ethylene.
- Taxon
- cucumber (Cucumis sativus)Cucumis sativuse1
- Treatment
- Co(2+)e0
- Outcome
- inhibitory effect of increased ethylene levelse0
- Direction
- did not counteracte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co(2+) did not counteract the inhibitory effect of increased ethylene levels.”
e1“light-grown cucumber (Cucumis sativus) seedlings”
Claim · model-written summary
At growth-promoting concentrations Co(2+) inhibited ethylene production in cucumber hypocotyl.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- hypocotyle0
- Treatment
- Co(2+)e0
- Outcome
- ethylene productione0
- Direction
- inhibitede0
- Qualifier
- at growth-promoting concentrationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co(2+), at growth-promoting concentrations, powerfully inhibited ethylene production in the cucumber hypocotyl.”
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See all 32 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.