CHANGES IN THE LEVEL OF PHENOLS DURING NEEDLE DEVELOPMENT IN SCOTS-PINE POPULATIONS IN A CONTROL AND POLLUTED ENVIRONMENT

Changes in the level of phenolic compounds in needles of young Scots-p ine (Pinus sylvestris) trees of various provenances were studied in an environment polluted by sulphur dioxide and fluorine compounds, and i n a control environment. An increase in the content of ortho-diphenols (o-dPh) and total phenols (TPh) was found in the first year of needle development. This increase was significantly greater in the plants fr om the polluted environment. Relative to levels in the control environ ment, the highest level of phenols in the polluted environment was fou nd in 2-year-old needles, followed by 3-year-old and then 1-year-old n eedles.