An Overview to Lichens: The Nutrient Composition of Some Species

Yıl 2010, Cilt: 3 Sayı: 2, 79 - 86, 31.12.2010

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Öz

Lichens are slow-growing symbiotic organisms consisting of a fungus and an algae.
Lichens count about 13.500 species growing throughout the world. Lichens have been used for
medicinal purposes throughout the ages, and beneficial claims have to some extent been correlated
with their polysaccharide content. Lichen polysaccharides which can be isolated in considerable
yield such as the α-glucans, β-glucans, and galactomannans are generally expected to be of fungal
origin. Several lichen species, such as Cetraria islandica and lobaria pulmonaria, have been used in
traditional medicine since ancient times, to treat a variety of illnesses. All lichen species
investigated so far produce polysaccharides in considerable amounts, up to 57%, and many of them
have been shown to exhibit antitumour, immunostimulating, antiviral activity as well as some types
of biological activity. There is a need for free-living algae, cyanobacteria and lichens mycobionts,
grown in isolated cultures, to have the best advantage of organic nitrogen compounds. 

Anahtar Kelimeler

Lichen, nutrition, polysaccharides, nitrogen compounds

Kaynakça

• Aagnes TH, Sormo W, Mathiesen SD 1995. Ruminal microbial digestion in freeliving, in captive lichen-fed, and in starved reindeer (rangifer tarandus tarandus) in winter. Applied and Enviromental Microbiology, 61, 583-591.