Seasonal changes of pigment content in the needles of Douglas fir (Pseudotsuga taxifolia Britt.) in natural conditions
1994
Bogdanovic, M. | Drazic, G. | Vuckovic, M. (University of Belgrade, Belgrade - Zemun (Yugoslavia). Institute for the Application of Nuclear Energy - INEP)
The results of investigations have shown that the age of the tree of the yellow form of Douglas fir may not be involved in chlorophyll and carotenoid contents of its needles. In all trees examined, needles of the past year had more chlorophyll and carotenoids. In the yellow form of Douglas fir there were only slight variations of pigment content in the needles during the year. Green variety needles, however, have a twofold pigment content than the yellow form, accompanied by greater variations. Interdependence of chlorophyll and carotenoid metabolism is discussed
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