Metabolic recovery of continental antarctic cryptogams after winter

Schlensog, M.; Pannewitz, Stefan; Green, T. G. A.; Schroeter, B.

doi:10.1007/s00300-004-0606-4

Cited by 41 publications

(34 citation statements)

References 40 publications

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“…Lichens recover rapidly but then remain active only briefly, while, at the other extreme, many mosses recover slowly but then remain active longer (Green et al 2011a;Kappen and Valladares 2007;Proctor 2004;Zotz et al 2000;Zotz and Rottenberger 2001). The greater time and thallus water content required by mosses to recover full activity, plus the enhanced respiratory activity after rehydration (Dilks and Proctor 1976;Farrar and Smith 1976;Schlensog et al 2004) means that partial hydration followed by rapid drying, as found in hot desert environments, can lead to damage and death (Coe et al 2012(Coe et al , 2014Barker et al 2005;Stark et al 2011). In view of the longer recovery times and ability to utilize heavier rainfall events, it is also not unexpected that bryophyte biomass in biocrusts will be positively linked to overall precipitation and they show a greater representation in wetter habitats (Wu et al 2015).…”

Section: Recovery From Desiccationmentioning

confidence: 95%

Physiology of Photosynthetic Organisms Within Biological Soil Crusts: Their Adaptation, Flexibility, and Plasticity

Green

Proctor

2016

Ecological Studies

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Section: Recovery From Desiccationmentioning

confidence: 95%

Physiology of Photosynthetic Organisms Within Biological Soil Crusts: Their Adaptation, Flexibility, and Plasticity

Green

Proctor

2016

Ecological Studies

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“…The quantity and quality of C inputs into soil can also be affected by environmental conditions. For instance, the photosynthetic activity of mosses was shown to recover more slowly from cold periods when compared to lichens (Schlensog et al, 2004). Freeze-thaw cycles are also believed to play an important role in C cycling in the Antarctic, not only due to the stress imposed on microbial communities, but also because they induce changes in exudation patterns of cryptogams (Tearle, 1987;Melick and Seppelt, 1992;Melick et al, 1994).…”

Section: Mineralization Immobilization and Nitrificationmentioning

confidence: 99%

Functional microarray analysis of nitrogen and carbon cycling genes across an Antarctic latitudinal transect

et al. 2007

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Soil-borne microbial communities were examined via a functional gene microarray approach across a southern polar latitudinal gradient to gain insight into the environmental factors steering soil Nand C-cycling in terrestrial Antarctic ecosystems. The abundance and diversity of functional gene families were studied for soil-borne microbial communities inhabiting a range of environments from 511S (cool temperate -Falkland Islands) to 721S (cold rock desert -Coal Nunatak). The recently designed functional gene array used contains 24 243 oligonucleotide probes and covers 410 000 genes in 4150 functional groups involved in nitrogen, carbon, sulfur and phosphorus cycling, metal reduction and resistance and organic contaminant degradation (He et al. 2007). The detected N-and C-cycle genes were significantly different across different sampling locations and vegetation types. A number of significant trends were observed regarding the distribution of key gene families across the environments examined. For example, the relative detection of cellulose degradation genes was correlated with temperature, and microbial C-fixation genes were more present in plots principally lacking vegetation. With respect to the N-cycle, denitrification genes were linked to higher soil temperatures, and N 2 -fixation genes were linked to plots mainly vegetated by lichens. These microarray-based results were confirmed for a number of gene families using specific real-time PCR, enzymatic assays and process rate measurements. The results presented demonstrate the utility of an integrated functional gene microarray approach in detecting shifts in functional community properties in environmental samples and provide insight into the forces driving important processes of terrestrial Antarctic nutrient cycling.

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“…When melt-water is no longer available the lichen desiccates immediately; however, a near-total water loss can be tolerated (Kappen & Valladares 1999;Kappen & Schroeter 2002;Proctor & Tuba 2002). Xanthoria mawsonii can successfully utilize light and occasional snow falls (Green et al 1999;Rudolph 1966a;Fritsen et al 2000) because it appears to be one of a group of species able to regain normal metabolic rates within minutes of being rehydrated (Proctor & Tuba 2002;Schlensog et al 2004). In addition, Lange & Kappen (1972) as well as Gannutz (1967) and Ahmadjian (1970) proposed that X. mawsonii might maintain substantial photosynthesis during snow free periods because of its ability to recover its photosynthetic activity by absorbing water vapour from air.…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic performance of Xanthoria mawsonii C. W. Dodge in coastal habitats, Ross Sea region, continental Antarctica

et al. 2005

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Xanthoria mawsonii C. W. Dodge was found to perform well physiologically in a variety of habitats at high latitudes in continental Antarctica. The net photosynthetic rate of 7·5 mol CO 2 kg 1 s 1 is exceptionally high for Antarctic lichens. Field and laboratory measurements proved the photosynthetic apparatus to be highly adapted to strong irradiance. The cold resistance of the photosystem II reaction centres is higher than the photosynthetic CO 2 fixation process. Optimum temperature for net photosynthesis was c. 10(C. The lichen grows along water channels where it is frequently inundated and hydrated to maximum water content, although net photosynthesis is strongly depressed by super saturation. In these habitats the lichen is photosynthetically active for long periods of time. Xanthoria mawsonii also grows at sites where it depends entirely on the early spring snow melt and occasional snow fall for moisture. It has an exceptionally short reactivation phase and is able to utilize snow immediately. Recovery of activity by absorbing water vapour from air, though practically possible, seems to be of ecological importance only under snow at subzero temperatures.

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Metabolic recovery of continental antarctic cryptogams after winter

Cited by 41 publications

References 40 publications

Physiology of Photosynthetic Organisms Within Biological Soil Crusts: Their Adaptation, Flexibility, and Plasticity

Physiology of Photosynthetic Organisms Within Biological Soil Crusts: Their Adaptation, Flexibility, and Plasticity

Functional microarray analysis of nitrogen and carbon cycling genes across an Antarctic latitudinal transect

Photosynthetic performance of Xanthoria mawsonii C. W. Dodge in coastal habitats, Ross Sea region, continental Antarctica

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