XVI International Botanical Congess

7-day barley seedlings were examined for susceptibility to Fusarium seedling blight. Material for the experiment consisted of 15 two-rowed double haploid (DH) lines , 13 six-rowed DH lines ,generations F1,F2,F3 and their parent forms cv. Maresi (two-rowed) and cv. Klimek (six-rowed). Barley seeds were surface disinfected and pre-germinated. Then seeds were inoculated and incubated.Severity of root and coleoptyle infection using 5 degree scale (1- ery weak,5-very strong pathogenicity) were evaluated. Root infection among DH lines was very strong and varied from 3.05-line MK46 to 4.47- line MK7 and similar to parent forms cv.Maresi - 4.40 and cv. Klimek - 3.95.A similar coleoptyle infection of parent forms cv. Maresi 0.4 and cv. Klimek 0.5 could point out to some resistance gene dispersion. A set of two-rowed DH barley lines was more susceptible - 80% of lines possessed more than 3.5 whereas six-rowed DH lines revealed lower susceptibility - 15% of lines were infected more than 3.50.