Abstract
The lipid composition of the two closely related birches Betula pubescens and Betula tortuosa was investigated. The total amount of lipids and the lipid composition was strikingly similar. The glycolipid content on a chlorophyll basis was high in both birches. A comparison of the. acyl groups revealed a small difference in 16:3 in monogalactosyl diacylglycerol, but the total amount of trienoic acids was similar. The acyl group composition in the nonplastid lipid phosphatidyl choline differed between the birches and B. tortuosa had a higher average number of double bonds. The observations on galactolipid and phospholipid could not explain the earlier stated higher tolerance of B. tortuosa to the freezing of its leaves
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