Possible functional roles of cortical depsides and medullary depsidones in the foliose lichen Hypogymnia physodes

Solhaug, Knut Asbjørn; Lind, Marius; Nybakken, Line; Gauslaa, Yngvar

doi:10.1016/j.flora.2007.12.002

Cited by 72 publications

(48 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These roles include antimicrobial activity, allelopathy, antiherbivory, chelating of heavy metals, light screening, and other proposed functions not yet sufficiently supported by experimental evidence under laboratory conditions (Lawrey 1986;Pöykkö et al 2005;Latkowska et al 2006;Hauck et al 2009;Solhaug et al 2009). Secondary metabolites may be responsible for the ecological success of lichenization, allowing lichens frequently to be the dominant organisms in environments characterized by extreme ecological conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Phytotoxic Effects of Usnic Acid on Cultures of Free-Living Alga Scenedesmus quadricauda and Aposymbiotically Grown Lichen Photobiont Trebouxia erici

Bačkor

Klemová

Bačkorová³

et al. 2010

J Chem Ecol

View full text Add to dashboard Cite

The phytotoxic effects of the lichen secondary metabolite-usnic acid on cultures of free living alga-Scenedesmus quadricauda (UTEX 76) and aposymbiotically grown lichen photobiont Trebouxia erici (UTEX 911) were assessed. We found a relatively strong inhibition effect of usnic acid on the growth of alga Scenedesmus, accompanied by an increase of cell size, an alteration of assimilation pigment composition, followed by strong degradation of chlorophyll a, a decrease of chlorophyll a fluorescence, and an increase of reactive oxygen species in the cells. The content of soluble proteins remained a stable parameter. Phytotoxicity of usnic acid on cultures of Trebouxia photobiont was significantly lower. Usnic acid in lichens may act as an allochemical that controls the division of photobiont cells, thereby regulating the balance between the photobiont and mycobiont forming thallus. Higher tolerance to usnic acid in Trebouxia cultures may be an adaptation resulting from the long term co-evolution of these algae with fungi that produce secondary metabolites.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparison of the Phytotoxic Effects of Usnic Acid on Cultures of Free-Living Alga Scenedesmus quadricauda and Aposymbiotically Grown Lichen Photobiont Trebouxia erici

Bačkor

Klemová

Bačkorová³

et al. 2010

J Chem Ecol

View full text Add to dashboard Cite

show abstract

“…Some reports say that compounds located in the medulla (e.g. depsidones) might be chelators of cations (Solhaug et al 2009). In this study, we found that exposure to Cd in foliose lichens decreased content of the medullary depsidones salazinic acid (in P. sulcata) and protocetraric acid (in F. caperata), but increased the content of cortical depside atranorin (in P. sulcata) and dibenzofurane usnic acid (in F. caperata), whereas metabolites (all depsides) of fruticose lichen E. prunastri did not change after Cd treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Some of them are located in the upper cortex, while most are located in the medulla (Solhaug et al 2009). These compounds have antiherbivore, antimicrobial and larvicidal effects, and can protect thalli from high UV irradiation and oxidative stress.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Cadmium on Photosynthetic Performance and Secondary Metabolites in the Lichens Parmelia sulcata, Flavoparmelia caperata and Evernia prunastri

Maslać¹,

Maslać²,

Tkalec³

2016

Acta Botanica Croatica

View full text Add to dashboard Cite

-Lichens are one of the most common air quality bioindicators. Airborne heavy metal pollution causes various physiological changes in lichens, but sensitivity to metal pollution is species specifi c. In this research, three lichen species (Parmelia sulcata, Flavoparmelia caperata and Evernia prunastri) were exposed to cadmium (50 mg L -1 ) in laboratory conditions. Photosynthetic effi ciency of photosystem II and content of secondary metabolites were determined after one, three and eight days of exposure. In all investigated species treatment of lichen thalli with cadmium signifi cantly changed F v /F m and R Fd only after eight days of exposure. Quantifi cation of metabolites showed a decreased content of the medullary depsidones salazinic acid (in P. sulcata) and protocetraric acid (in F. caperata) but increased content of cortical depside atranorin (in P. sulcata) and dibenzofurane usnic acid (in F. caperata) after cadmium exposure. However, no changes in secondary metabolites were found in E. prunastri. Results show that investigated species are relatively resistant to short-term cadmium-exposure and that secondary metabolites could have an important role in the protection of primary metabolism from negative cadmium impacts, at least in some species.

show abstract

“…Lichens may contain substantial amounts of secondary metabolites, usually between 0.1 and 10 % of the dry weight, but sometimes up to 30 % (Galun and Shomer-Ilan 1988;Stocker-Wörgötter 2008;Solhaug et al 2009). More than 800 secondary metabolites are known from lichens, most are unique to these organisms and only a small minority occurs in the other fungi or higher plants.…”

Section: Lichen Metabolitesmentioning

confidence: 99%

Lichens as a Potential Source of Bioactive Secondary Metabolites

Ranković

Kosanić

2014

Lichen Secondary Metabolites

View full text Add to dashboard Cite

Lichens are complex symbiotic associations between fungi and algae which are important constituents of many ecosystems. The production of various unique extracellular secondary metabolites known as lichen substances is the result of this symbiosis. These compounds exist within the thalli and typically form crystals on the surface of the fungal hyphae. Thus far, more than 800 secondary metabolites of lichens have been discovered, most of them being exclusively present in lichens. In recent date, lichens have been taken up for many researches concerning the phytochemical and pharmaceutical applications. Lichens and their secondary metabolites have many pharmaceutical roles, primarily including antimicrobial, antioxidant, antiviral, anticancer, antigenotoxic, anti-inflammatory, analgesic and antipyretic activities. Hence, the present study was undertaken to explain the lichens as the important potential sources of bioactive secondary metabolites.

show abstract

Possible functional roles of cortical depsides and medullary depsidones in the foliose lichen Hypogymnia physodes

Cited by 72 publications

References 48 publications

Comparison of the Phytotoxic Effects of Usnic Acid on Cultures of Free-Living Alga Scenedesmus quadricauda and Aposymbiotically Grown Lichen Photobiont Trebouxia erici

Comparison of the Phytotoxic Effects of Usnic Acid on Cultures of Free-Living Alga Scenedesmus quadricauda and Aposymbiotically Grown Lichen Photobiont Trebouxia erici

The Impact of Cadmium on Photosynthetic Performance and Secondary Metabolites in the Lichens Parmelia sulcata, Flavoparmelia caperata and Evernia prunastri

Lichens as a Potential Source of Bioactive Secondary Metabolites

Contact Info

Product

Resources

About