AI Article Synopsis

  • The study investigated the effects of natural and artificial defoliation on the composition of birch (Betula pendula Roth.) leaves, focusing on total lipids and flavonoid content.
  • Researchers identified 11 fatty acids and noted changes in their quantities, particularly an increase in short-chain saturated fatty acids and trienoic acids after defoliation.
  • Additionally, while overall extractive substances decreased following defoliation, the levels of flavanones and flavanonol increased, and the assay method developed could be valuable for analyzing plant extracts.

Article Abstract

Qualitative and quantitative compositions of extracts of birch (Betula pendula Roth.) leaves after natural and artificial defoliations were studied. Composition of the fraction of total lipids was determined. Overall, 11 fatty acids were identified. Differences between the fatty acid compositions of total lipids in the trees subjected to defoliation, consisting in the increase in quantities of short-chain saturated fatty acids and trienoic acids, were detected. Nine individual compounds--six flavones, two flavanones, and one flavanonol--were isolated from the flavonoid fraction by column chromatography. It was found that the total content of extractive substances in birch leaves as well as amounts of free sterols, triterpene compounds, and flavones decreased 1 year after an artificial defoliation and 1 month after depredation of 75% of birch stands by gypsy moth. On the contrary, the contents of flavanones and flavanonol increased. The assay method proposed may be used for studying the compositions of plant extracts.

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