期刊
BIOFOULING
卷 28, 期 2, 页码 215-224出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927014.2012.663751
关键词
phototrophic biofilms; cyanobacteria; sandstone biodeterioration; exopolysaccharides; UV-protective pigments; metal affinity; ETR (electron transport rate)
资金
- DST, Government of India
- Italian Ministry of Foreign Affairs
Three coccoid and two filamentous cyanobacterial strains were isolated from phototrophic biofilms exposed to intense solar radiation on lithic surfaces of the Parasurameswar Temple and Khandagiri caves, located in Orissa State, India. Based on to their morphological features, the three coccoid strains were assigned to the genera Gloeocapsosis and Gloeocapsa, while the two filamentous strains were assigned to the genera Leptolyngbya and Plectonema. Eleven to 12 neutral and acidic sugars were detected in the slime secreted by the five strains. The secretions showed a high affinity for bivalent metal cations, suggesting their ability to actively contribute to weakening the mineral substrata. The secretion of protective pigments in the polysaccharide layers, namely mycosporine amino acid-like substances (MAAs) and scytonemins, under exposure to UV radiation showed how the acclimation response contributes to the persistence of cyanobacteria on exposed lithoid surfaces in tropical areas.
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