Annual variation in photoacclimation and photoprotection of the photobiont in the foliose lichen Xanthoria parietina

Vráblíková, Hana; McEvoy, Maria; Solhaug, Knut Asbjørn; Barták, Miloš; Gauslaa, Yngvar

doi:10.1016/j.jphotobiol.2005.12.019

Cited by 58 publications

(47 citation statements)

References 48 publications

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“…Studies carried out with X. parietina in N Europe reported seasonal fluctuations of the Chl a/b ratio consisting in higher Chl a/b ratios, lower total chlorophylls and higher xanthophylls toward the summer (Vráblíková et al 2006). Generally, in central and N Europe water availability is not a limiting factor, hence pigments acclimation is driven directly by seasonal changes in solar radiation.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

et al. 2010

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“…Lichens represent the symbionts of fungi (mainly ascomycete) and algae (mainly green algae) or fungi and cyanobacteria (less common) [28]. Lichens are comparatively more resistant to extreme temperature and desiccation which allows them to flourish and grow in wide variety of habitats some of them may be hostile to other forms of lives [102,103]. Lichens are among the pioneer organisms which inhabits the exposed stone surfaces.…”

Section: Lichensmentioning

confidence: 99%

Microbially induced deterioration of architectural heritages: routes and mechanisms involved

2012

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Since ancient time, magnificence and beauty have been the goals of architecture. Artists and architects used high strength, durable and beautiful stones like marble and limestone for the construction of monuments like Taj Mahal, Milan Cathedral, Roman Catacombs and Necropolis in Rome etc. These historic monuments are exposed to open air which allows the invading army of algae, cyanobacteria, fungi etc. to easily access them. The invasion of microorganisms and their subsequent interaction with mineral matrix of the stone substrate under varied environment conditions fosters deterioration of stones by multiple mechanisms resulting in loss of strength, durability, and aesthetic appearance. The review details about the major routes and mechanisms which led to biodeterioration, discusses current remedial methodologies and suggests future directions.

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“…Low light intensities due to topography, seasonal changes, or shade by adjacent vegetation tend to increase F v /F m values (Hamerlynck et al, 2002;Backor et al, 2006;Vráblíková et al, 2006). In B. argenteum and D. muscorum, litter cover had a similar effect, but only for the samples collected in December.…”

Section: Effects Of Litter Cover On Chlorophyll a Fluorescence Paramementioning

confidence: 97%

Bromus tectorum litter alters photosynthetic characteristics of biological soil crusts from a semiarid shrubland

Serpe

Roberts

Eldridge

et al. 2013

Soil Biology and Biochemistry

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Invasion by the exotic annual grass Bromus tectorum has increased the cover and connectivity of fine litter in the sagebrush steppes of western North America. This litter tends to cover biological soil crusts, which could affect their metabolism and growth. To investigate this possible phenomenon, biological soil crusts dominated by either the moss Bryum argenteum or the lichen Diploschistes muscorum were covered with B. tectorum litter (litter treatment) or left uncovered (control treatment) and exposed to natural field conditions. After periods of five and ten months, we removed the litter and compared the photosynthetic performance of biological soil crusts from the two treatments. Litter induced photosynthetic changes in our samples. In both B. argenteum and D. muscorum, biological soil crusts that had been covered with litter for ten months had lower rates of gross photosynthesis and lower chlorophyll content than control samples. Similarly in both biological soil crust types, litter reduced the rate of dark respiration. For D. muscorum, the reduction in dark respiration fully compensated for the decrease in gross photosynthesis, resulting in similar values of net photosynthesis in the two treatments. In contrast, for B. argenteum, net photosynthesis was four-times greater in the control than the litter treatment. Also under litter cover, D. muscorum showed three common adaptations to shade conditions: a decrease in the light compensation point, in the light intensity needed to achieve 95% of maximal net photosynthesis, and in the chlorophyll a/b ratio. None of these changes was apparent in B. argenteum. Overall, our results indicate that photosynthetic responses to the presence of litter varied among species of the crust biota and that the litter can reduce the photosynthetic capacity of biological soil crusts. These results help to explain field observations of decreases in biological soil crust cover and changes in biological soil crust composition with increases in litter cover, and suggest that the landscape-wide invasion by B. tectorum may have substantial effects on biological soil crust performance and therefore their capacity to function in semiarid shrublands.Keywords: Biological soil crusts, Bromus tectorum, Bryum argenteum, Diploschistes muscorum, lichens, litter, mosses, photosynthesis, semiarid environments, sagebrush steppe Abbreviations: Biological soil crusts (biocrusts), ΔF/F m ', photosystem II operating efficiency, F v /F m , maximum quantum efficiency of photosystem II photochemistry; LCP, light compensation point, NPQ, non-photochemical quenching; PPFR 95% , light intensity necessary to achieve 95% of maximal net photosynthesis 2

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Annual variation in photoacclimation and photoprotection of the photobiont in the foliose lichen Xanthoria parietina

Cited by 58 publications

References 48 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

Microbially induced deterioration of architectural heritages: routes and mechanisms involved

Bromus tectorum litter alters photosynthetic characteristics of biological soil crusts from a semiarid shrubland

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