Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans

Barták, Miloš; Váczi, Peter; Hájek, Josef; Smykla, Jerzy

doi:10.1007/s00300-007-0331-x

Cited by 48 publications

(37 citation statements)

References 18 publications

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“…It is well comparable to the evidence from a wide variety of organisms (mainly lichens) investigated by a chlorophyll fluorescence approach, see e.g. Kappen et al 1995, Kappen et al 1996, Barták et al 2005, Barták et al 2007.…”

Section: Discussionsupporting

confidence: 85%

Diurnal changes in photosynthetic activity of the biological soil crust and lichen: Effects of abiotic factors (Petuniabukta, Svalbard)

Sehnal¹,

Barták²,

Váczi³

2014

Czech Polar Rep.

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In polar ecosystems, primary producers have to cope with a very harsh climate that limits the time available for growth and biomass production. In this study, diurnal measurement of photosynthetic processes in biological soil crust and a lichen were carried out in Petuniabukta, Spitsbergen. For field measurements, a method of induced fluorescence of chlorophyll was used. Measurements of photosynthetic activity were taken as repetitive measurements of effective quantum yield of photosystem II (Φ PSII ). The short-term field measurements were carried out for 10 days in summer 2014. Φ PSII was recorded each 5 minutes as well as microclimatic data (air temperature, air humidity, photosynthetically active radiation -PAR). The microclimatic parameters were recorded by a datalogger. In general, physiological activity of both biological soil crust and a lichen showed daily courses. Tested lichen was Cladonia rangiferina and the most dominant species in biological soil crust was Nostoc sp. Typically, most of Φ PSII values ranged 0.6 -0.7 in both model organisms. The results have shown that photosynthetic activity was strongly correlated with all observed abiotic factors in both study objects. Particularly important was the relation found between PAR and Φ PSII in biological soil crust. When the biological soil crust was exposed to high PAR doses of irradiation (about 2300 µmol m -2 s -1 ) photoinhibition of primary processes of photosynthesis was observed as Φ PSII decrease, while photosynthetic activity of lichen remained at same level. Furthermore, it has been demonstrated increasing that in situ photosynthetic activity increased in both biological soil crust and lichen with a decrease in temperature.

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Section: Discussionsupporting

confidence: 85%

Diurnal changes in photosynthetic activity of the biological soil crust and lichen: Effects of abiotic factors (Petuniabukta, Svalbard)

Sehnal¹,

Barták²,

Váczi³

2014

Czech Polar Rep.

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“…Therefore, they are abundant and often the dominant life form in terrestrial ecosystems of the Antarctic (Øvstedal & Smith, 2001), the Arctic (Longton, 1988;Printzen, 2008) and high alpine regions (Türk & Gärtner, 2001). Ecophysiological and experimental studies have revealed that lichens can survive long periods of cold and drought, and can even survive conditions of outer space in a cryptobiotic stage (Kappen, 1993;Barták et al, 2007;Raggio et al, 2011;Schroeter et al, 2011). Recent results from the continental Antarctic indicate that lichens are active for < 10% of the year (Schroeter et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Alphaproteobacterial communities in geographically distant populations of the lichenCetraria aculeata

Printzen

Fernández-Mendoza

Muggia

et al. 2012

FEMS Microbiol Ecol

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Lichen symbioses were recently shown to include diverse bacterial communities. Although the biogeography of lichen species is fairly well known, the patterns of their bacterial associates are relatively poorly understood. Here we analyse the composition of Alphaproteobacteria in Cetraria aculeata, a common lichen species that occurs at high latitudes and various habitats. Using clone libraries we show that most of the associated Alphaproteobacteria belong to Acetobacteraceae, which have also been found previously in other lichen species of acidic soils and rocks in alpine habitats. The majority of alphaproteobacterial sequences from C. aculeata are very similar to each other and form a single clade. Data from C. aculeata reveal that alphaproteobacterial communities of high latitudes are depauperate and more closely related to each other than to those of extrapolar habitats. This agrees with previous findings for the fungal and algal symbiont in this lichen. Similar to the algal partner, the composition of lichen alphaproteobacterial communities is affected by environmental parameters.

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“…Generally, photosynthetic temperature optimum ranges in lichens within 14 to 22 °C (Hájek et al 2001, Coxson and Coyle 2003) and -5 °C to -13.7 °C (Friedman and Sun 2005, Pannewitz et al 2005, Reiter et al 2008 for temperate and cold regions, respectively. Decrease in thallus temperature below this range causes inhibition of both photochemical (Barták et al 2005(Barták et al , 2007 and biochemical (Lange 2003) processes of photosynthesis. Towards subzero temperature, however, many lichen species perform gradually decreasing but still substantial photosynthesis.…”

Section: Discussionmentioning

confidence: 98%

“…Barták et al 2003Barták et al , 2007. The method allows to measure dark-adapted background fluorescence (F 0 ), maximum fluorescence on darkadapted sample (F m ), maximum fluorescence on lightadapted sample (F m´) , and steady-state fluorescence during irradiation (F s ) from Chl fluorescence image recorded by a CCD camera during light-induced Kautsky kinetics.…”

Section: Methodsmentioning

confidence: 99%

Cryoproective role of ribitol in Xanthoparmelia somloensis

Hájek¹,

Váczi²,

Barták³

et al. 2009

Biologia plant.

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Thalli of Xanthoparmelia somloensis with natural content of polyols (control) and polyol-free thalli (acetone-rinsed) were used to study ribitol effects at low temperatures. Thalli segments were cultivated in ribitol concentration of 32 or 50 mM for 168 h at temperatures +5, 0, and -5 °C. The chlorophyll fluorescence parameters (potential yield of photochemical reactions in PS 2 (variable to maximum fluorescence ratio, F v /F m ), effective quantum yield of photochemical reactions in PS 2 (Φ PS2 ), and non-photochemical quenching (NPQ) were monitored in 24-h intervals using an imaging system. The effect of 32 mM ribitol on F v /F m and Φ PS2 was apparent only at -5 °C, however, the effect was seen throughout the whole exposure. Surprisingly, 50 mM ribitol concentration treatment led to a decrease in F v /F m and Φ PS2 and to an increase in NPQ values at -5 °C, while no change was observed at 0 °C and +5 °C. Acetone-rinsing caused decrease of F v /F m , Φ PS2 and NPQ.Additional key words: chlorophyll fluorescence imaging, fluorescence parameters, lichen thallus, low temperature, Trebouxia.

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Low-temperature limitation of primary photosynthetic processes in Antarctic lichens Umbilicaria antarctica and Xanthoria elegans

Cited by 48 publications

References 18 publications

Diurnal changes in photosynthetic activity of the biological soil crust and lichen: Effects of abiotic factors (Petuniabukta, Svalbard)

Diurnal changes in photosynthetic activity of the biological soil crust and lichen: Effects of abiotic factors (Petuniabukta, Svalbard)

Alphaproteobacterial communities in geographically distant populations of the lichenCetraria aculeata

Cryoproective role of ribitol in Xanthoparmelia somloensis

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