Abstract
Daylily flowers (Hemerocallis hybrid, cv. Stella d'Oro) senesce and die autonomously over a 24 h period after opening. Investigations were performed to determine some of the mechanisms that lead to death of the petals. The flowers are insensitive to ethylene, but exogenous ABA prematurely upregulates events that occur during natural senescence, such as loss of differential membrane permeability, increases in lipid peroxidation and the induction of proteinase and RNase activities. Furthermore, the same patterns of proteinase and RNase activities appearing on activity gels during natural senescence are induced prematurely by ABA. The mRNA profile from ABA-treated, prematurely senescing petals visualized by differential display shows a high degree of similarity to the mRNA profile of naturally senescing petals 18 h later. In addition, endogenous ABA increases before flower opening and continues to increase during petal senescence. An osmotic stress by sorbitol increases endogenous levels of ABA and upregulates the same parameters of senescence as those occurring during natural senescence and after application of ABA. The mRNA profile from sorbitol-treated, prematurely senescing petals shows a high degree of similarity to mRNA from naturally senescing petals, but somewhat less similarity to mRNA from ABA-treated petals. The possibility is discussed that ABA is a constituent of the signal transduction chain leading to programmed cell death of daylily petals.
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Claims 13
Claim · model-written summary
Daylily flowers senesce and die within 24 hours after opening.
- Taxon
- Daylily
_v2.jpg?width=60)
Hemerocallis hybrid cultivare0 - Material
- cv. Stella d'Oroe0
- Outcome
- senesce and die autonomouslye0
- Value
- 24 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_v2.jpg?width=500)
Verbatim
e0“Daylily flowers (Hemerocallis hybrid, cv. Stella d'Oro) senesce and die autonomously over a 24 h period after opening.”
Claim · model-written summary
Daylily flowers were insensitive to ethylene.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Treatment
- ethylenee0
- Outcome
- insensitive to ethylenee0
- Direction
- insensitivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The flowers are insensitive to ethylene”
t0“daylily petals”
Claim · model-written summary
Exogenous ABA prematurely caused loss of differential membrane permeability in daylily petals.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petalst0
- Treatment
- exogenous ABAe0
- Outcome
- loss of differential membrane permeabilitye0
- Direction
- prematurely upregulatese0
- Comparator
- natural senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA prematurely upregulates events that occur during natural senescence, such as loss of differential membrane permeability, increases in lipid peroxidation and the induction of proteinase and RNase activities.”
t0“daylily petals”
Claim · model-written summary
Exogenous ABA prematurely increased lipid peroxidation in daylily petals.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petalst0
- Treatment
- exogenous ABAe0
- Outcome
- lipid peroxidatione0
- Direction
- increasese0
- Comparator
- natural senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA prematurely upregulates events that occur during natural senescence, such as loss of differential membrane permeability, increases in lipid peroxidation and the induction of proteinase and RNase activities.”
t0“daylily petals”
Claim · model-written summary
Exogenous ABA prematurely induced proteinase activity in daylily petals.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petalst0
- Treatment
- exogenous ABAe0
- Outcome
- proteinasee0
- Direction
- inductione0
- Comparator
- natural senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA prematurely upregulates events that occur during natural senescence, such as loss of differential membrane permeability, increases in lipid peroxidation and the induction of proteinase and RNase activities.”
t0“daylily petals”
Claim · model-written summary
Exogenous ABA prematurely induced RNase activity in daylily petals.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petalst0
- Treatment
- exogenous ABAe0
- Outcome
- RNase activitiese0
- Direction
- inductione0
- Comparator
- natural senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA prematurely upregulates events that occur during natural senescence, such as loss of differential membrane permeability, increases in lipid peroxidation and the induction of proteinase and RNase activities.”
t0“daylily petals”
Claim · model-written summary
ABA prematurely induced the same proteinase and RNase activity-gel patterns as natural senescence.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petalst0
- Treatment
- ABAe0
- Outcome
- same patterns of proteinase and RNase activitiese0
- Comparator
- natural senescencee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the same patterns of proteinase and RNase activities appearing on activity gels during natural senescence are induced prematurely by ABA.”
t0“daylily petals”
Claim · model-written summary
The mRNA profile of ABA-treated prematurely senescing petals closely resembled that of naturally senescing petals 18 hours later.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petalse0
- Treatment
- ABA-treatede0
- Outcome
- high degree of similaritye0
- Value
- 18 he0
- Comparator
- naturally senescing petalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mRNA profile from ABA-treated, prematurely senescing petals visualized by differential display shows a high degree of similarity to the mRNA profile of naturally senescing petals 18 h later.”
t0“daylily petals”
Claim · model-written summary
Endogenous ABA increased before daylily flowers opened.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- flower openinge0
- Outcome
- endogenous ABAe0
- Direction
- increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“endogenous ABA increases before flower opening and continues to increase during petal senescence.”
t0“daylily petals”
Claim · model-written summary
Endogenous ABA continued increasing during daylily petal senescence.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Organ / stage
- petal senescencee0
- Outcome
- endogenous ABAe0
- Direction
- continues to increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“endogenous ABA increases before flower opening and continues to increase during petal senescence.”
t0“daylily petals”
Claim · model-written summary
Sorbitol osmotic stress raised endogenous ABA levels.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Treatment
- osmotic stress by sorbitole0
- Outcome
- endogenous levels of ABAe0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An osmotic stress by sorbitol increases endogenous levels of ABA”
t0“daylily petals”
Claim · model-written summary
Sorbitol osmotic stress upregulated the same senescence parameters seen in natural and ABA-induced senescence.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Treatment
- osmotic stress by sorbitole0
- Outcome
- same parameters of senescencee0
- Direction
- upregulatese0
- Comparator
- natural senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An osmotic stress by sorbitol increases endogenous levels of ABA and upregulates the same parameters of senescence as those occurring during natural senescence and after application of ABA.”
t0“daylily petals”
Claim · model-written summary
The mRNA profile of sorbitol-treated prematurely senescing petals closely resembled natural senescence but resembled ABA-treated petals somewhat less.
- Taxon
- DaylilyHemerocallis hybrid cultivart0
- Treatment
- sorbitol-treatede0
- Outcome
- high degree of similaritye0
- Qualifier
- somewhat less similarity to mRNA from ABA-treated petalse0
- Comparator
- naturally senescing petalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mRNA profile from sorbitol-treated, prematurely senescing petals shows a high degree of similarity to mRNA from naturally senescing petals, but somewhat less similarity to mRNA from ABA-treated petals.”
t0“daylily petals”
The same questions in other papers
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- no effect
(+)-abscisic acid · physiology: oxidative · Hemerocallis hybrid cultivar (daylily)Results agree
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- negative
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(+)-abscisic acid · physiology: enzyme activity · Hemerocallis hybrid cultivar (daylily)Results agree
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- negative
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drought · quality: postharvest · Hemerocallis hybrid cultivar (daylily)Results agree
1 paper in the same direction as this paper
- negative
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.