UV-B Light Effects on Scenedesmus LF-1 and Some Synechocystis PCC 6803 Mutants

Rigoni, Fernanda; Barbato, Roberto; Chiaramonte, Simona; Giacometti, Giorgio M.

doi:10.1007/978-94-009-0173-5_780

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The diluted algal suspension (10-15 ^g Chi thetic oxygen evolution capacity. The Dl-protein is de-ml"') was placed in open Petri dishes in a ca 15 mm thick graded not only under PAR but also during UV-B expo-layer and exposed to a combination of PAR (80 W m"^) sure (Greenberg et al 1989, Rigoni et al 1995. Here, from a standard 20 W fiuorescent tube with UV-A and we investigate the Dl-degradation in the tolerant and UV-B radiation produced by a single TL-12 fiuorescence susceptible algae exposed to elevated UV-B radiation.…”

Section: Introductionmentioning

confidence: 99%

Strategies of ultraviolet-B protection in microscopic algae

Xiong¹,

Komenda²,

Kopeckỳ³

et al. 1997

Physiol Plant

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L. 1997. Strategies of ultraviolet-B protection in microscopic algae. -Physiol. Plant. 100: 378-388.Different species of microalgae show a wide range of susceptibility to ultraviolet-B (UV-B) radiation. To identify factors responsible for the UV-B tolerance of some of the algae, we compared 8 species that are highly tolerant to UV-B to 8 species that are highly susceptible. The tolerant species contained substantial amounts of an acetolysis-resistant residue. The residue consists of sporopoUenin, a biopolymer of variable chemical composition that occurs in the algal cell walls and absorbs UV-B radiation. The susceptible species contained little or no sporopoUenin. We propose that sporopoUenin provides protection to the tolerant species by screening the incident UV-B radiation. Previous studies showed that the mycosporine-like amino acids (MAA) also act as effective UV-B screens. Our data indicate that sporopoUenin provides a constant protection while MAA are induced hy radiation stress and occur with some delay. The tolerant species also differ from the susceptible species in their capacity to repair the reaction centers damaged by UV-B. The tolerant algae became vulnerable to UV-B when protein synthesis needed for repair was blocked by streptomycin. In the susceptihle species, streptomycin had no effect during the UV-B stress. The repair deficiency in the susceptible species can be explained either by relatively less effective protein synthesis or by an inhibition of the protein synthesis by UV-B. In the tolerant species, the stmctures needed for protein synthesis are protected by UV-B screening of sporopoUenin and MAA.

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Section: Introductionmentioning

confidence: 99%

Strategies of ultraviolet-B protection in microscopic algae

Xiong¹,

Komenda²,

Kopeckỳ³

et al. 1997

Physiol Plant

View full text Add to dashboard Cite

show abstract

Strategies of ultraviolet‐B protection in microscopic algae

Xiong

Komenda

Kopeckỳ

et al. 1997

Physiologia Plantarum

106

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Different species of microalgae show a wide range of susceptibility to ultraviolet‐B (UV‐B) radiation. To identify factors responsible for the UV‐B tolerance of some of the algae, we compared 8 species that are highly tolerant to UV‐B to 8 species that are highly susceptible. The tolerant species contained substantial amounts of an acetolysis‐resistant residue. The residue consists of sporopollenin, a biopolymer of variable chemical composition that occurs in the algal cell walls and absorbs UV‐B radiation. The susceptible species contained little or no sporopollenin. We propose that sporopollenin provides protection to the tolerant species by screening the incident UV‐B radiation. Previous studies showed that the mycosporine‐like amino acids (MAA) also act as effective UV‐B screens. Our data indicate that sporopollenin provides a constant protection while MAA are induced by radiation stress and occur with some delay. The tolerant species also differ from the susceptible species in their capacity to repair the reaction centers damaged by UV‐B. The tolerant algae became vulnerable to UV‐B when protein synthesis needed for repair was blocked by streptomycin. In the susceptible species, streptomycin had no effect during the UV‐B stress. The repair deficiency in the susceptible species can be explained either by relatively less effective protein synthesis or by an inhibition of the protein synthesis by UV‐B. In the tolerant species, the structures needed for protein synthesis are protected by UV‐B screening of sporopollenin and MAA.

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UV-B Light Effects on Scenedesmus LF-1 and Some Synechocystis PCC 6803 Mutants

Cited by 2 publications

References 6 publications

Strategies of ultraviolet-B protection in microscopic algae

Strategies of ultraviolet-B protection in microscopic algae

Strategies of ultraviolet‐B protection in microscopic algae

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