PHYSICAL NATURE SUBSTRATE INFLUENCE ON IN VITRO GERMINATION OF Ipomoea tricolor Cav. - BLIDAR, Cristian Felix; EGYED, Ildikó; TOMULESCU, Ioana Mihaela; TRIPON, Ioana Maria; GOSTIN, Irina Neta (Annals of Oradea University, Biology Fascicle / Analele Universităţii din Oradea, Fascicula Biologie, 2023)