Abstract
Light affects the responses of plants to gravity. For example, light is inhibitory to the gravimorphogenesis of cucumber seedlings, peg formation. We have suggested that auxin regulates peg formation by stimulating the expression of auxin-inducible genes including CsACS1 that encodes key enzyme in ethylene synthesis. We also have hypothesized that ethylene promotes the development of peg in cucumber seedlings. To understand how light inhibits peg formation, we examined the effects of light on the auxin-induced peg formation, the expression of auxin-inducible genes and ethylene production in cucumber seedlings. Number of seedlings that produced a peg in response to applied IAA was significantly decreased by exposure to light compared with that in the dark. In addition, exposure of seedlings to light decreased mRNA accumulation of CsACS1 and ethylene production. However ethylene application did not compensate the inhibition of peg formation by light. These results suggest that light blocks auxin-mediated step(s) including CsACS1 expression for the initiation of peg formation.
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Claims 5
Claim · model-written summary
Light significantly reduced IAA-induced peg formation in cucumber seedlings relative to darkness.
- Taxon
- cucumber seedlings
Cucumis sativust0 - Organ / stage
- seedlingse0
- Treatment
- exposure to lighte0
- Outcome
- Number of seedlings that produced a pege0
- Direction
- decreasede0
- Comparator
- in the darke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of seedlings that produced a peg in response to applied IAA was significantly decreased by exposure to light compared with that in the dark.”
t0“cucumber seedlings”
Claim · model-written summary
Light decreased CsACS1 mRNA accumulation in cucumber seedlings.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- exposure of seedlings to lighte0
- Gene
- CsACS1e0
- Outcome
- mRNA accumulation of CsACS1e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposure of seedlings to light decreased mRNA accumulation of CsACS1 and ethylene production.”
t0“cucumber seedlings”
Claim · model-written summary
Light decreased ethylene production in cucumber seedlings.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- exposure of seedlings to lighte0
- Outcome
- ethylene productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposure of seedlings to light decreased mRNA accumulation of CsACS1 and ethylene production.”
t0“cucumber seedlings”
Claim · model-written summary
Ethylene application did not compensate for light inhibition of peg formation.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- ethylene applicatione0
- Outcome
- inhibition of peg formation by lighte0
- Direction
- did not compensatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethylene application did not compensate the inhibition of peg formation by light.”
t0“cucumber seedlings”
Claim · model-written summary
The authors infer that light blocks auxin-mediated steps including CsACS1 expression during peg initiation.
- Taxon
- cucumber seedlingsCucumis sativust0
- Gene
- CsACS1e0
- Outcome
- initiation of peg formatione0
- Qualifier
- auxin-mediated step(s)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light blocks auxin-mediated step(s) including CsACS1 expression for the initiation of peg formation.”
t0“cucumber seedlings”
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