| Popis: |
As a cause of Fusarium ear rot in maize and a producer of cancerogenous mycotoxin fumonisin B1 and fumonisin (FB2), Fusarium verticillioides (Sacc.) Nirenberg (G) has been attracting great attention recently. Breeding for resistance seems to be the most effective mean of control. Therefore, the aim of this investigation is screening elite germplasm to identify resistant lines per se and in hybrid combinations. Planting resistant or tolerant hybrids reduces risk from infection with F. verticillioides. 30 inbred lines and 18 maize hybrids were tested for resistance in field trials in Rugvica in 2005 under conditions of artificial ear inoculation with F. verticillioides. Modified inoculation technique was used with a needle that has two side openings and is usually applied for stalk infection. Significant differences in resistance degree were obtained among the tested genotypes using the 1-7 scale. Average rating for lines and hybrids varied from 2, 0 to 5, 8, and from 2, 8 to 5, 7 respectively. The most resistant lines were Bc 126, Bc 280, Bc 8040 and R 2226. They proved their resistance in hybrid combinations too. Line Bc 741-23 was resistant only per se. Susceptible lines were prevailing, while most hybrids were moderately susceptible or susceptible. No correlative association between mean resistance of the parents and hybrid resistance was found (r = 0, 35) which indicates the complexity of the nature of resistance and the difficulty in breeding for resistance. |
