Journal
EUROPEAN JOURNAL OF BIOCHEMISTRY
Volume 270, Issue 10, Pages 2120-2125Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1432-1033.2003.03556.x
Keywords
alkanes; lichen; mycobiont; photobiont Trebouxia; Xanthoria
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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 Trebouxia 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 C-8 -C-15 (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 C-22 -C-34 . Dehydroabietic acid was found in both lichen and mycobiont. 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 wt)(-1) ; n -alkane concentrations in the photobiont and mycobiont were 17-24 and 215-262 mg.(g dry wt)(-1) , respectively.
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