Claim · model-written summary
In darkness, carotenoids were initially sustained and then gradually declined.
- Taxon
- Hordeum vulgare L.
.jpg?width=60)
Hordeum vulgaree1 - Outcome
- carotenoid levelse0
- Direction
- declined graduallye0
- Qualifier
- during the course of senescencee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“carotenoid levels were sustained, and declined gradually during the course of senescence”
e1“light-grown Hordeum vulgare L. cv. Dyan seedlings”
Title
Abscisic acid-induced senescence in light- and dark-incubated detached leaves of barley
Rachel M. Dent; A. Keith Cowan South African Journal of Botany 1994. doi:10.1016/s0254-6299(16)30589-0
Other claims from this paper (11)
- Observation In darkness, leaf chlorophyll declined rapidly.
- Observation In darkness, ABA levels increased sharply.
- Intervention effect Untreated leaves under continuous light lost chlorophyll and carotenoids faster than leaves in darkness.
- Intervention effect Untreated illuminated leaves accumulated ABA more slowly than dark leaves.
- Intervention effect Exogenous ABA accelerated chlorophyll and carotenoid decline in illuminated leaves, with stronger decline at higher concentrations.
- Intervention effect Exogenous ABA from 0.1 to 100 μM had little or no significant effect on chlorophyll loss in dark leaves.
- Observation Dark-incubated leaf segments were insensitive to exogenous ABA according to their chlorophyll to carotenoid ratio.
- Intervention effect At 1 mM ABA, chlorophyll loss was delayed in dark-incubated leaves.
- Mechanism Authors proposed that transient carotenoid, especially xanthophyll, accumulation prevented exogenous ABA from accelerating chlorophyll breakdown in dark leaves.
- Association Authors suggested rapid endogenous ABA elevation might relate to transient xanthophyll accumulation.
- Mechanism Authors suggested slower carotenoid breakdown contributes to the difference in ABA-induced chlorophyll loss between illuminated and dark leaves.