TAILIEUCHUNG - Báo cáo khoa học: Characterization of surface n -alkanes and fatty acids of the epiphytic lichen Xanthoria parietina, its photobiont a green alga Trebouxia sp., and its mycobiont, from the Jerusalem hills

Surface alkanes and fatty acids from the thalli of the lichen Xanthoria parietina, its photobiont Trebouxiasp., and its mycobiont were analysed by GC-MS. The green algaTre-bouxiasp. synthesizedmainlyunsaturated fattyacids suchas (Z,Z,Z)-9,12,15-18 : 3 (Z,Z)-9,12-18 : 2 and (Z)-9-18 : 1, and light alkanes C8-C15 (upto83% of total n-alkanes). However, the mycobiont contained mainly saturated fatty acids such as hexadecanoic (16 : 0) and octadecanoic acid (18 : 0), and also very long-chain n-alkanes C22–C34 | Eur. J. Biochem. 270 2120-2125 2003 FEBS 2003 doi Characterization of surface n-alkanes and fatty acids of the epiphytic lichen Xanthoria parietina its photobiont a green alga Trebouxia sp. and its mycobiont from the Jerusalem hills A. Torres1 I. Dor2 J. Rotem3 M. Srebnik1 and V. M. Dembitsky1 1 Department of Medicinal Chemistry and Natural Products School of Pharmacy PO Box 12065 The Hebrew University of Jerusalem 91120 Israel 2Division of Environmental Sciences Graduate School of Applied Science The Hebrew University of Jerusalem Israel 3Department of Plant Pathology ARO Ministry of Agriculture Bet Dagan Israel Surface alkanes and fatty acids from the thalli of the lichen Xanthoria parietina its photobiont Trebouxia sp. and its mycobiont were analysed by GC-MS. The green alga Tre-bouxia sp. synthesized mainly unsaturated fatty acids such as Z Z Z -9 12 15-18 3 Z Z -9 12-18 2 and Z -9-18 1 and light alkanes C8-C15 up to 83 of total n-alkanes . However the mycobiont contained mainly saturated fatty acids such as hexadecanoic 16 0 and octadecanoic acid 18 0 and also very long-chain n-alkanes C22-C34. Dehydroabietic acid was found in both lichen and mycobi ont. The occurrence of different amounts of n-alkanes and fatty acids in the photobionts and mycobionts of X. parietina was shown for the first time. Lichens collected from different locations in the Jerusalem hills contained n-alkanes ranging in concentration from 187 to 211 mg- g dry wf -1 n-alkane concentrations in the photobiont and mycobiont were 17-24 and 215-262 mg- g dry wt -1 respectively. Keywords alkanes lichen mycobiont photobiont Trebouxia Xanthoria. Lichens have been described as dual organisms because they are symbiotic associations between two or sometimes more entirely different types of micro-organism a fungus termed the mycobiont and a green alga or a cyanobacterium termed the photobiont . These organisms have both algal and fungal properties 1 2 and produce .

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