Peculiarities of seasonal dynamics in needle photosyntetic pygments in introduced Juniperus communis L. populations

We have made complex studies into the state of the state of Juniperus communis L. in the created populations of introduced plants. The objects of the study are in the south taiga zone 57o 30` N.L. and 63o 43` E.L. Alongside morphological indices growth conditions - soil types and the main mineral elements - have been srudied seasonal dynamics in the content of chlorophylls and carotinoids in Juniperus communis L. needles have been investigated during three years in «botanic» and «park forest» populations with different levels of soil structuredness and moisture supply. In typical conditions of the Middle Urals (2014) the green pygment content is maximum in august and is gradually lover towards autumn. Annual means for chlorophyll accumulation in a park - forest population in 2016 were higher - 3.01 against 2.5 mg/year. 2015 was damp and precipitation total was +160 % against the standard, therefore, chlorophyll content in august was 3.1 in the park - forest population, 2.8 in the botanical garden population, in the abnormally dry and hot 2016 - 2.37 and 2.65 mg/year accordingly. In 2016 maximum pigment accumulation was observed in march due to increased chlorophyll b acculation because of plastid divergence, dormancy release and the beginning of the vegetation period yet in march. In stress situation, there was an increased level of chlorophyll b, a participant of the light - harvesting complex of the photosystem II and an adaptive peculiarity of Juniperus communis L. Compared to other evergreen coniferous species, the chlorophyll a/b ratio was lower, averagely 0.94 to 2.21 while in other species the ratio was 2.5 to 3. Chlorophyll content was very sensitive to changes in weather and habitat conditions. Seasonal dynamics in Juniperus communis L., needles followed regularities typical of evergreen coniferous plants.