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Priming is one of the most common methods improving seed quality. The purpose of the research was to study effects of osmopriming on milk thistle seed g ermination, vigour, health and location of fungi at 10 and 20°C. Seeds (achenes) of two samples (I, II) were primed in the polyethylene glycol (PEG) solutions o f osmotic potentials of -1.0, -1.25 and -1.5 MPa, at 15°C for 3, 5 and 7 days. Applied variants of primin g mproved energy of seed germination and germination c apa ity at 10°C in both samples. Enhancement of these parameters was also observed at 20°C, if seeds of sample I were primed in the PEG solutions of osmotic potentials of -1.0 MPa for 7 days and -1.25 a nd -1.5 MPa for 5 and 7 days. Priming, regardless o f time and osmotic potential of PEG, accelerated seed g rmination at 10 and 20°C in both samples. Fungi o f genera: Alternaria, Cladosporium, Fusarium and Rhizopus were frequently identified on the seeds. After priming significantly increased seed infestation wit h fungi, especially in sample I. The fungi were more ften detected in pericarps and seed coats than embry os. Many a time, after priming an increase in inner achene infestation was observed.

EFFECTS OF OSMOPRIMING ON GERMINATION, VIGOUR AND HEALTH OF SILYBUM MARIANUM (L.) GAERTN. SEEDS