Abstract
In flowering plants, floral longevity is species-specific and is closely linked to reproductive strategy; petal senescence, a type of programmed cell death (PCD), is a highly regulated developmental process. However, little is known about regulatory pathways for cell death in petal senescence, which is developmentally controlled in an age-dependent manner. Here, we show that a NAC transcription factor, designated EPHEMERAL1 (EPH1), positively regulates PCD during petal senescence in the ephemeral flowers of Japanese morning glory (Ipomoea nil). EPH1 expression is induced independently of ethylene signaling, and suppression of EPH1 resulted in Japanese morning glory flowers that are in bloom until the second day. The suppressed expression of EPH1 delays progression of PCD, possibly through suppression of the expression of PCD-related genes, including genes for plant caspase and autophagy in the petals. Our data further suggest that EPH1 is involved in the regulation of ethylene-accelerated petal senescence. In this study, we identified a key regulator of PCD in petal senescence, which will facilitate further elucidation of the regulatory network of petal senescence.
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Claims 6
Claim · model-written summary
EPH1 positively regulates programmed cell death during Japanese morning glory petal senescence.
- Taxon
- Japanese morning glory
Ipomoea nile0 - Organ / stage
- petale0
- Gene
- EPHEMERAL1 (EPH1)e0
- Outcome
- PCD during petal senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a NAC transcription factor, designated EPHEMERAL1 (EPH1), positively regulates PCD during petal senescence in the ephemeral flowers of Japanese morning glory (Ipomoea nil)”
Claim · model-written summary
EPH1 expression is induced independently of ethylene signaling.
- Taxon
- Japanese morning gloryIpomoea nilt0
- Gene
- EPH1e0
- Outcome
- EPH1 expressione0
- Qualifier
- independently of ethylene signalinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EPH1 expression is induced independently of ethylene signaling”
t0“Japanese morning glory”
Claim · model-written summary
Suppressing EPH1 kept Japanese morning glory flowers in bloom until the second day.
- Taxon
- Japanese morning gloryIpomoea nile0
- Treatment
- suppression of EPH1e0
- Gene
- EPH1e0
- Outcome
- flowers that are in bloom until the second daye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppression of EPH1 resulted in Japanese morning glory flowers that are in bloom until the second day”
Claim · model-written summary
Suppressing EPH1 expression delayed progression of petal programmed cell death.
- Taxon
- Japanese morning gloryIpomoea nilt0
- Organ / stage
- petalse0
- Treatment
- suppressed expression of EPH1e0
- Gene
- EPH1e0
- Outcome
- progression of PCDe0
- Direction
- delayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The suppressed expression of EPH1 delays progression of PCD, possibly through suppression of the expression of PCD-related genes, including genes for plant caspase and autophagy in the petals”
t0“Japanese morning glory”
Claim · model-written summary
The authors suggest suppressed PCD-related gene expression may mediate delayed PCD under EPH1 suppression.
- Taxon
- Japanese morning gloryIpomoea nilt0
- Organ / stage
- petalse0
- Gene
- PCD-related genese0
- Outcome
- suppression of the expression of PCD-related genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“possibly through suppression of the expression of PCD-related genes, including genes for plant caspase and autophagy in the petals”
t0“Japanese morning glory”
Claim · model-written summary
EPH1 may regulate ethylene-accelerated petal senescence.
- Taxon
- Japanese morning gloryIpomoea nilt0
- Gene
- EPH1e0
- Outcome
- ethylene-accelerated petal senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EPH1 is involved in the regulation of ethylene-accelerated petal senescence”
t0“Japanese morning glory”