Mode of Action of the Massively Accumulated beta-Carotene of Dunaliella bardawil in Protecting the Alga against Damage by Excess Irradiation.

@article{BenAmotz1989ModeOA,
  title={Mode of Action of the Massively Accumulated beta-Carotene of Dunaliella bardawil in Protecting the Alga against Damage by Excess Irradiation.},
  author={Ami Ben-Amotz and Aviv Shaish and Mordhay Avron},
  journal={Plant physiology},
  year={1989},
  volume={91 3},
  pages={
          1040-3
        }
}
When grown under defined conditions Dunaliella bardawil accumulates a high concentration of beta-carotene, which is composed primarily of two isomers, all-trans and 9-cis beta-carotene. The high beta-carotene alga is substantially resistant to photoinhibition of photosynthetic oxygen evolution when compared with low beta-carotene D. bardawil or with Dunaliella salina which is incapable of accumulating beta-carotene. Protection against photoinhibition in the high beta-carotene D. bardawil is… Expand
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References

SHOWING 1-10 OF 12 REFERENCES
On the Factors Which Determine Massive beta-Carotene Accumulation in the Halotolerant Alga Dunaliella bardawil.
TLDR
The results are interpreted as indicating a protecting effect of beta-carotene against injury by high irradiance under conditions of impairment in chlorophyll content per cell. Expand
Stereoisomers of β-Carotene and Phytoene in the Alga Dunaliella bardawil
TLDR
The data suggest that the isomerization reaction which leads to the production of the 9-cis isomer occurs early in the path of carotene biosynthesis, at or before the formation of all-trans phytoene. Expand
MASSIVE ACCUMULATION OF PHYTOENE INDUCED BY NORFLURAZON IN DUNALIELLA BARDAWIL (CHLOROPHYCEAE) PREVENTS RECOVERY FROM PHOTOINHIBITION 1
TLDR
Observations are in agreement with the hypothesis that the accumulated β‐carotene in Dunaliella bardawil protects the cells against injury by excessive irradiation. Expand
THE WAVELENGTH DEPENDENCE OF MASSIVE CAROTENE SYNTHESIS IN DUNALIELLA BARDAWIL (CHLOROPHYCEAE) 1
TLDR
Accumulation of β‐carotene and an increase in the ratio of the 9‐cis to the all‐trans isomer are strongly dependent on the light intensity under which the algae are cultivated but are independent of light quality within the photosynthetically active radiation range. Expand
ACCUMULATION OF β‐CAROTENE IN HALOTOLERANT ALGE: PURIFICATION AND CHARACTERIZATION OF β‐CAROTENE‐RICH GLOBULES FROM DUNALIELLA BARDAWIL (CHLOROPHYCEAE) 1
TLDR
It is suggested that the β‐carotene globules may serve to protect D. bardawil against injury by the high intensity irradiation to which this alga is usually exposed in nature. Expand
CAROTENOIDS AND HERBICIDE ACTION
TLDR
The results of a series of experiments have shown that the photodestruction of carotenoids is induced by the inhibition of cyclic electron flow around photosystem I and more specifically with the functioning of the reaction centre, P700. Expand
Photosynthesis and Pigments Influenced By Light Intensity and Salinity in the Halophile Dunaliella Salina (Chlorophyta)
TLDR
Dunal (1837) originally described the taxon now known as Dunaliella salina (Dunal) Teodoresco, 1905, as consisting of spherical or elliptical cells, red-orange to rust coloured, so any isolate of DunAliella which is not capable of turning redorange to Rust coloured should not be considered D. salina . Expand
Mechanisms of Inactivation of Oxygen Species by Carotenoids
Although carotenoid pigments have been implicated as anti-carcinogenic compounds for several years, based on both epidemiological evidence (1) as well as experiments in animals (2,3), the exactExpand
Regulation of carotenoid biosynthesis.
TLDR
This chapter discusses the regulation of carotenoid biosynthesis, which is related biosynthetically and share a common early pathway with other biologically important isoprenoids such as sterols, gibberellins, and terpenoid quinines. Expand
Interaction of oxygen and oxy-radicals with carotenoids.
TLDR
It was concluded that carotenoid pigments function as protective agents by quenching triplet sensitizers, singlet oxygen, and radical intermediates. Expand
...
1
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