Functional biomolecules of Antarctic stromatolitic and endolithic cyanobacterial communities

For activity and survival in extreme terrestrial Antarctic habitats, lithobiontic cyanobacteria depend on key biomolecules for protection against environmental stress and for optimization of growth conditions. Their ability to synthesize such molecules is central to their pioneering characteristics and major role as primary producers in Antarctic desert habitats. Pigmentation is especially important in protecting them against enhanced UVB damage during stratospheric ozone depletion (the Ozone Hole) during the Antarctic spring and subsequent photoinhibition in the intense insolation of the summer. To be effective, especially for the screening of highly shade-adapted photosystems of cyanobacteria, protective pigments need to be located strategically. Antarctic lithic cyanobacterial communities are therefore stratified, as in soil biofilms of Alexander Island, the benthic stromatolitic mats of ice-covered hypersaline lakes in the McMurdo Dry Valleys, and the endolithic communities within translucent Beacon s...

[1]  D. Wynn-Williams.  Cyanobacteria in Deserts — Life at the Limit? , 2000 .

[2]  Ian Wright,et al.  COMPARATIVE RAMAN MICROSCOPY OF A MARTIAN METEORITE AND ANTARCTIC LITHIC ANALOGUES , 1999 .

[3]  D. Wynn-Williams.  Antarctica as a model for ancient Mars , 1999 .

[4]  H. Edwards,et al.  Comparative FT-Raman spectroscopy of Xanthoria lichen-substratum systems from temperate and antarctic habitats , 1998 .

[5]  T. McGenity,et al.  Halobacteria: the evidence for longevity , 1998, Extremophiles.

[6]  David D. Wynn-Williams,et al.  FT-Raman spectroscopic analysis of endolithic microbial communities from Beacon sandstone in Victoria Land, Antarctica , 1998, Antarctic Science.

[7]  U. Karsten,et al.  Ultraviolet-absorbing scytonemin and mycosporine-like amino acid derivatives in exposed, rock-inhabiting cyanobacterial lichens , 1997, Oecologia.

[8]  H. Edwards,et al.  Fourier Transform Raman spectroscopic and scanning electron microscopic study of cryptoendolithic lichens from Antarctica , 1997 .

[9]  D. Schindler,et al.  Past ultraviolet radiation environments in lakes derived from fossil pigments , 1997, Nature.

[10]  W. Bilger,et al.  UV-B-induced synthesis of photoprotective pigments and extracellular polysaccharides in the terrestrial cyanobacterium Nostoc commune , 1997, Journal of bacteriology.

[11]  H. Edwards,et al.  Moisture and habitat structure as regulators for microalgal colonists in diverse Antarctic terrestrial habitats , 1997 .

[12]  J. Belnap,et al.  MICROENVIRONMENTS AND MICROSCALE PRODUCTIVITY OF CYANOBACTERIAL DESERT CRUSTS 1 , 1996 .

[13]  Donkor Va,et al.  Effects of ultraviolet irradiation on photosynthetic pigments in some filamentous cyanobacteria , 1996 .

[14]  M. Kühl,et al.  An endoevaporitic microbial mat within a gypsum crust: Zonation of phototrophs, photopigments, and light penetration , 1995 .

[15]  S. Scherer,et al.  Structure of a Novel Oligosaccharide-Mycosporine-Amino Acid Ultraviolet A/B Sunscreen Pigment from the Terrestrial Cyanobacterium Nostoc commune(*) , 1995, The Journal of Biological Chemistry.

[16]  W. Bilger,et al.  Light Exposure and the Composition of Lipophilous Carotenoids in Cyanobacterial Lichens , 1994 .

[17]  R. Wharton.  Stromatolitic Mats in Antarctic Lakes , 1994 .

[18]  R. Castenholz,et al.  ANTARCTIC CYANOBACTERIA: LIGHT, NUTRIENTS, AND PHOTOSYNTHESIS IN THE MICROBIAL MAT ENVIRONMENT 1 , 1993 .

[19]  R. Castenholz,et al.  Evidence Regarding the UV Sunscreen Role of a Mycosporine-Like Compound in the Cyanobacterium Gloeocapsa sp , 1993, Applied and environmental microbiology.

[20]  T. Ali,et al.  A review of the role of oligotrophic micro-organisms in biodeterioration , 1993 .

[21]  R. Castenholz,et al.  Occurrence of UV-Absorbing, Mycosporine-Like Compounds among Cyanobacterial Isolates and an Estimate of Their Screening Capacity , 1993, Applied and environmental microbiology.

[22]  Otto L. Lange,et al.  Taxonomic composition and photosynthetic characteristics of the biological soil crusts covering sand dunes in the western Negev Desert , 1992 .

[23]  R. Worrest,et al.  EFFECTS OF ENHANCED SOLAR ULTRAVIOLET RADIATION ON AQUATIC ECOSYSTEMS , 1991 .

[24]  E. Fernández,et al.  Quantitative variations of phenolic compounds related to thallus age in Umbilicaria antarctica , 1991 .

[25]  D. Wynn-Williams.  3.5 Television Image Analysis of Microbial Communities in Antarctic Fellfields , 1988 .

[26]  E. Friedmann,et al.  Cryptoendolithic lichen and cyanobacterial communities of the Ross Desert, Antarctica. , 1988, Polarforschung.

[27]  J. Farman,et al.  Large losses of total ozone in Antarctica reveal seasonal ClOx/NOx interaction , 1985, Nature.

[28]  C. Culberson.  Chemical and botanical guide to lichen products , 1970 .

[29]  Elisabet Henrilsson.  The Occurrence of Carotenoids in Some Lichen Species Belonging to the Collemataceae , 1963 .