Morphological and physiological variability of Hypericum perforatum L. natural populations in the conditions of forest-steppe zone in Tatarstan Republic

The coenopopulyation (CP) of Hypericum perforatum L. in three regions of forest-steppe zone in Tatarstan Republic (TR) have been studied. Within each area CP on meadows, edges of the broad-leaved forests, in the pine forests or landings were investigated. Researches have shown that features of natural-historical regions of TR exerted significant impact on realization of biological potential of individuals and contents in them secondary metabolites. The maximum indicators of the vegetative and generative sphere, the maintenance of flavonoids have been noted near the western Prevolga forest-steppe. In this area an optimum condition for growth and development of Hypericum perforatum L. is the ruderal community - the growing arable land. The minimum values on all indicators took place near the southeast of Zakamsky forest-steppe. The area is characterized by a smaller amount of precipitation in a season, colder winter temperatures. During research dependence between ecological-coenotical conditions and indicators of vital condition of individuals of the CP has been revealed. In all areas deterioration in a vital condition of individuals among a meadow - the broad-leaved forest - the pine forest has been revealed, the exception was made by pine landings on gray forest soils where the vital condition of individuals and the maintenance of flavonoids remained high. Reliable dependence between some indicators of a vital condition of individuals of the CP and the maintenance of flavonoids has been revealed.