CHANGES OF PIGMENTS CONTENT IN NEEDLES OF PINUS-HALEPENSIS MILL

Content of chlorophylls a and b and of carotenoids has been investigat ed spectrophotometrically in needles of Pinus halepensis during the ye ar, in polluted and unpolluted localities. Concentrations of all pigme nts were low in general; they fluctuated monthly and showed a tendency to decrease in the needles from polluted sites. The decrease appears to correspond with the level of air pollution. The chlorophylls a:b ra tio, however, could apparently not be considered as time and degree of site pollution dependent.