Tolerance of the lichen Xanthoria parietina (L.) Th. Fr. to metal stress

Dzubaj, Alexander; Bačkor, Martin; Tomko, Jaroslav; Péli, Evelin Ramóna; Tuba, Zoltán

doi:10.1016/j.ecoenv.2007.04.002

Cited by 56 publications

(16 citation statements)

References 33 publications

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“…In fact, demonstrated that N-facing transplants of air-dry thalli of X. parietina to whom parietin was removed remained vital and healthy, while S-facing transplants partly died or bleached. Dzubaj et al (2008) found a content of chlorophyll and carotenoids in X. parietina thalli similar to ours, and a correlation between the ratio carotenoids/chlorophyll and the amount of parietin, indicating that parietin synthesis may also affect the chlorophyll content.…”

Section: Discussionsupporting

confidence: 59%

Influence of sun irradiance and water availability on lichen photosynthetic pigments during a Mediterranean summer

et al. 2010

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This study was carried out to investigate changes in lichen photosynthetic pigments induced by different combinations of light irradiance and water availability during a Mediterranean summer. To this purpose, thalli of three epiphytic lichens with a markedly different ecology concerning photo-hygrophytism, namely Evernia prunastri (hygro-mesophytic), Flavoparmelia caperata (mesophytic) and Xanthoria parietina (xero-mesophytic), were transplanted for 30 days to N-and S-facing cardinal exposures in central Italy. To investigate the effect of thallus hydration, at each cardinal exposure 50% of thalli were hydrated daily with deionised water. The results showed that changes in the concentrations of photosynthetic pigments are species-specific and consist in a general depression of photosynthetic pigments only in the hygro-mesophytic species E. prunastri. The pattern of photosynthetic pigments was also investigated in spontaneous samples along contrasting aspects. In this case, X. parietina from S-facing slopes, adapted to direct solar influx, showed higher pigment content than N-facing thalli; F. caperata and E. prunastri avoid direct extreme solar radiation and assimilation pigments were influenced more by the shadowing of tree canopies than by the cardinal exposure. The influence of drought on lichen photosynthetic pigments in the Mediterranean area is discussed.

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Section: Discussionsupporting

confidence: 59%

Influence of sun irradiance and water availability on lichen photosynthetic pigments during a Mediterranean summer

et al. 2010

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“…Healthy lichens have F v /F m in the range 0.6 -0.7 (Dzubaj et al 2008) and lower values indicate damage to PS 2 and hence a decreased photosynthetic efficiency. This parameter is used routinely to establish the physiological status of thalli in experimental and environmental lichenology (Garty 2001).…”

Section: Lichen Metabolism and Heavy Metalsmentioning

confidence: 99%

Interactions of lichens with heavy metals

Bačkor¹,

Loppi²

2009

Biologia plant.

199

108

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Recent developments in knowledge about the interactions between lichens and heavy metals at different levels, from populations to cells and from ecology to molecular biology are reviewed. Sources of heavy metals, mechanisms of heavy metal accumulation and detoxification by lichens are discussed. Special emphasis is placed on ultrastructural changes as well as physiological parameters such as membrane integrity, pigment composition, chlorophyll a fluorescence, photosynthesis, respiration, contents of ATP, amino acids, ergosterol, ethylene, non-protein thiols, activity of antioxidant enzymes and expression of stress proteins.

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“…Authentic samples of cortical lichen substances were used when available: atranorin (Sigma; the compound was a mixture of atranorin and chloroatranorin), (+) usnic acid (Aldrich). Crystals of parietin isolated previously from the lichen Xanthoria parietina (purity approximately 98%; Dzubaj et al 2008) were also used as a standard. Based on the amount of lichen secondary metabolites in the intact slice of lichen thalli and the amount of lichen biomass consumed by larvae, we calculated the proportion of ingested secondary metabolites found in larval biomass and in faeces.…”

Section: Metabolizing Lichen Secondary Metabolitesmentioning

confidence: 99%

Host use of a specialist lichen-feeder: dealing with lichen secondary metabolites

Pöykkö

Bačkor²,

Bencúrová³

et al. 2010

Oecologia

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Host use by herbivores is largely determined by host properties such as nutrient content and chemical defence against foragers. The impacts of these attributes on a herbivore may largely depend on its life cycle stage. Lichen species are known to differ in nutritional quality and level of chemical defence and, consequently, vary as fodder for herbivores. The aim of this study was to explore the impact of several lichen species and the presence of their secondary metabolites on their use as hosts by a specialist lichen-feeder, Cleorodes lichenaria. This study also addressed, for the first time, how a specialist lichen-feeder deals with different lichen secondary metabolites. In the beginning of their development, larvae grew better on Xanthoria parietina than on the other host lichens, whereas older larvae grew best on Ramalina fraxinea. Lichen secondary chemicals in R. fraxinea and Parmelia sulcata hindered larval growth in the beginning but after 75 days lichen secondary chemicals had no impact on the mass of larvae. Physodic acids in Hypogymnia physodes were lethal to larvae. In general, larvae metabolized 70-95% of ingested lichen secondary chemicals and the rest of these were excreted in frass. Lichen secondary metabolites in P. sulcata restrict and in H. physodes prevent their use as a host for C. lichenaria larvae. Our main finding, the ability of larvae to metabolize several lichen secondary metabolites, indicates digestive adaptation to these chemicals. No signs of sequestration of these chemicals were found.

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Tolerance of the lichen Xanthoria parietina (L.) Th. Fr. to metal stress

Cited by 56 publications

References 33 publications

Influence of sun irradiance and water availability on lichen photosynthetic pigments during a Mediterranean summer

Influence of sun irradiance and water availability on lichen photosynthetic pigments during a Mediterranean summer

Interactions of lichens with heavy metals

Host use of a specialist lichen-feeder: dealing with lichen secondary metabolites

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