Seasonal dynamics of the photosynthetic apparatus parameters of upright and prostrate pine species using the example of Pinus sibirica and P. pumila

The seed progeny photosynthesis intensity and the photosynthetic apparatus state of genus Pinus species different life forms were studied in seasonal dynamics: P. sibirica is an upright tree, pumila a prostrate species. age was twelve years old. both increased from May to July, maximum July amounted 9.2 mg CO2 mg-1 fr. m. h-1 Siberian stone pine 7.8 dwarf pine, August assimilation activity began decrease Studies have shown that summer P had values 15-20 % higher than those pumila. In winter months, chlorophyll content did not differ significantly between species; at same time, during growing season, contained more pigments pine. An assessment functional showed dynamics quantum yield photochemistry (Fv/Fm) photosystem II (PSII), real PS ^psII) similar character: Fv/ Fm sharply decreased November February, March June, reached its practically change June-Septem-ber October. electron transport rate (ETR) minimal April, May, July. August, significant ETR observed. differed May-September differences - species, compared indicate specific physiological parameters.