Bakalárska práca sa venuje detekcií a charakterizácií fytoplaziem v súbore okrasných a divo rastúcich rastlín. V teoretickej časti je najprv definovaný pojem fytoplazma, ďalej sa zaoberá detekciou klasifikáciou a epidemiológiou fytoplaziem. Na záver podáva aktuálne poznatky o ´Candidatus Phytoplasma oryzae´. Experimentálna časť práce sa zaoberá detekciou a charakteristikou fytoplaziem pochádzajúcich z Cirsium arvense, Dahlia pinnata a Erigeron Annuus na úrovni 16S rRNA génu. U Erigeron Annuus bola detekovaná fytoplazma stolburu. U Cirsium arvense a Dahlia pinnata bola detekovaná a charakterizovaná doteraz nepopísaná fytoplazma pre ktorú bolo navrhnuté pomenovanie ´Candidatus Phytoplasma cirsii´.This bachelor's thesis deals with detection and characterization of phytoplasmas in collection of ornamental and wild plants. The theoretical part at first defines the term phytoplasma, then deals with detection, classification and epidemiology of phytoplasmas. In conclusion this part also gives current knowledge about ´Candidatus Phytoplasma oryzae´. The experimental part deals with detection and characterization of phytoplasmas from Cirsium arvense, Dahlia pinnata and Erigeron annuus at the level of the 16S rRNA gene. In Erigeron annuus was detected Stolbur phytoplasma. In Cirsium arvense and Dahlia pinnata was detected and characterized previously undiscovered phytoplasma, for which the name ´Candidatus Phytoplasma cirsii´ was proposed.