FATTY ACID COMPOSITION OF MONOGALACTOSYLDIACYLGLYCEROLS IN ANTHOCEROS AGRESTIS AND CONOCEPHALUM CONICUM

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  The main fatty acids in monogalactosyldiacylglycerols (MGDG) of Anthoceros agrestis and Conocephalum conicum were 16 : 3ω3 and 18: 3ω3 and they comprised 87% and 83%, respectively, of the total fatty acids of MGDG. The highly unsaturated C₂₀ fatty acids were minor compounds making up 5% in both species. This result is a further indication that the acylation of MGDG with C₂₀ polyunsaturated fatty acids is dependent on the phylogenetic branching time of the different bryophyte taxa. Hornworts and liverworts with low proportion of C₂₀ polyenoates both represent an old taxon, while other bryophytes appear to contain C₂₀ fatty acids in MGDG the more the later phylogenetic branching has occurred (Sewón 1992).