Xanthophyll Cycle in Marine Macroalgae

Vershinin, Alexander; Камнев, А.Н.

doi:10.1515/botm.1996.39.1-6.421

Cited by 25 publications

(15 citation statements)

References 9 publications

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“…The general contribution of the xanthophyll cycle to the protection of marine macroalgae from photodamage induced by high levels of PAR has previously been demonstrated by several authors, e.g. Vershinin and Kamnev (1996), Hanelt et al (1997b), Schofield et al (1998), andHarker et al (1999). Although the database is still very limited, there is evidence that the xanthophyll cycle may also be a target of UV-B radiation.…”

Section: Discussionmentioning

confidence: 94%

“…Studied parameters include the changes in Rubisco concentration and activity, which previously have been found to be primarily affected by UV-B (Strid et al 1990;Bischof et al 2000), and photosynthetic pigments, which are also reported to exhibit a substantial response to UV-B, even under field conditions (Figueroa et al 1997). Additionally, the concentrations of compounds related to the xanthophyll cycle have been studied to test whether this important protective mechanism against photodamage induced by high irradiances of photosynthetically active radiation (PAR; see Demmig-Adams 1990;Vershinin and Kamnev 1996;Niyogi et al 1997;Harker et al 1999) might also be impaired by UV-B.…”

Section: Introductionmentioning

confidence: 99%

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Solar ultraviolet radiation affects the activity of ribulose-1,5-bisphosphate carboxylase-oxygenase and the composition of photosynthetic and xanthophyll cycle pigments in the intertidal green alga Ulva lactuca L.

Bischof

Kräbs

Wiencke

et al. 2002

Planta

125

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The effect of solar UV radiation on the physiology of the intertidal green macroalga Ulva lactuca L. was investigated. A natural Ulva community at the shore of Helgoland was covered with screening foils, excluding UV-B or UV-B + UV-A from the solar spectrum. In the sampled material, changes in the activity and concentration of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco), and the concentration of photosynthetic and xanthophyll cycle pigments were determined. Exclusion of UV radiation from the natural solar spectrum resulted in an elevated overall activity of Rubisco, related to an increase in its cellular concentration. Among the photosynthetic pigments, lutein concentration was substantially elevated under UV exclusion. In addition, marked UV effects on the xanthophyll cycle were found: exclusion of solar UV radiation (and particularly UV-B) resulted in an increased ratio of zeaxanthin concentration to the total xanthophyll content, indicating adverse effects of UV-B on the efficiency of photoprotection under high irradiances of photosynthetically active radiation. The results confirm a marked impact of present UV-B levels on macroalgal physiology under field conditions.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Solar ultraviolet radiation affects the activity of ribulose-1,5-bisphosphate carboxylase-oxygenase and the composition of photosynthetic and xanthophyll cycle pigments in the intertidal green alga Ulva lactuca L.

Bischof

Kräbs

Wiencke

et al. 2002

Planta

125

View full text Add to dashboard Cite

show abstract

“…Several studies showed the important role of the VAZ cycle in photoprotection (Demmig et al. 1987; Vershinin & Kamnev 1996; Schofield et al. 1998; Havaux & Niyogi 1999; Rodrigues et al.…”

Section: Discussionmentioning

confidence: 99%

Photoacclimation of the invasive alga Caulerpa racemosa var. cylindracea to depth and daylight patterns and a putative new role for siphonaxanthin

et al. 2006

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The introduced green alga Caulerpa racemosa var. cylindracea grows along a broad depth range (from very shallow to 60 m depth) in the Mediterranean basin. In the present work, the photoacclimation capacity of this invasive variety was investigated in summer, the season of its maximum spread. Natural populations from the Gulf of Naples (Italy) were analyzed for photoresponse on two scales of light variability: a spatial scale (at three stations along a depth gradient, from 0.3 to 20 m depth) and a temporal scale (on the shallowest meadow, from sunrise to sunset). These responses were studied through pigment analysis (with HPLC), and in situ measurements of photosynthetic parameters (with a Diving‐PAM fluorometer). Electron transport rate (ETR)–irradiance curve parameters showed acclimation along environmental gradients dominated by variation in irradiance. In the shallowest plants, the lack of a midday depression in both the maximum relative ETRs and the photosynthetic efficiency at sub‐saturating irradiance (α) pointed to a maintenance of energy conversion levels despite the protective lowering of light‐harvesting efficiency revealed by the trend in Fv/Fm. On the other side, variation of photosynthetic efficiency occurred with depth and buffered the effect of decreasing light on maximum photosynthetic rates. A previously undescribed xanthophyll cycle centred on lutein‐siphonaxanthin interconversion appeared to operate in the shallowest populations in addition to the violaxanthin/antheraxanthin/zeaxanthin cycle commonly occurring in Chlorophyta; this would further enhance phototolerance of the alga. A further role of siphonaxanthin is in the acclimation to low light of deep environments as indicated by its stronger increase from the surface to the deepest station with respect to siphonein and chlorophyll b.

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“…Studies performed in in vitro models revealed that carotenoids inhibited carcinogeninduced neoplastic transformation, inhibited plasma membrane lipid oxidation, and caused unregulated expression of connexin 43 [100]. On the other hand, according to some researchers, the antitumor activity of carotenoids could be associated with decreasing the fluidity of the lipid bilayer [101]. It is to be noted that suppression of membrane fluidity is the mechanism whereby tamoxifenrelated compounds exert their anti-cancer action.…”

Section: Structural Aspects Of Chemopreventive Phytochemicals Of Herbmentioning

confidence: 99%

Antimicrobial and Chemopreventive Properties of Herbs and Spices

Lai

Roy²

2004

CMC

479

258

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Herbs and spices have been used for generations by humans as food and to treat ailments. Scientific evidence is accumulating that many of these herbs and spices do have medicinal properties that alleviate symptoms or prevent disease. A growing body of research has demonstrated that the commonly used herbs and spices such as garlic, black cumin, cloves, cinnamon, thyme, allspices, bay leaves, mustard, and rosemary, possess antimicrobial properties that, in some cases, can be used therapeutically. Other spices, such as saffron, a food colorant; turmeric, a yellow colored spice; tea, either green or black, and flaxseed do contain potent phytochemicals, including carotenoids, curcumins, catechins, lignan respectively, which provide significant protection against cancer. This review discusses recent data on the antimicrobial and chemopreventive activities of some herbs and spices and their ingredients.

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Xanthophyll Cycle in Marine Macroalgae

Cited by 25 publications

References 9 publications

Solar ultraviolet radiation affects the activity of ribulose-1,5-bisphosphate carboxylase-oxygenase and the composition of photosynthetic and xanthophyll cycle pigments in the intertidal green alga Ulva lactuca L.

Solar ultraviolet radiation affects the activity of ribulose-1,5-bisphosphate carboxylase-oxygenase and the composition of photosynthetic and xanthophyll cycle pigments in the intertidal green alga Ulva lactuca L.

Photoacclimation of the invasive alga Caulerpa racemosa var. cylindracea to depth and daylight patterns and a putative new role for siphonaxanthin

Antimicrobial and Chemopreventive Properties of Herbs and Spices

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