Research on the interaction peculiarities of common wheat with Fusarium oxysporum isolates

The purpose of the research was to establish the cluster organization of Fusarium oxysporum isolates, collected in different localities of the Republic of Moldova, the variability and heritability of wheat plant growth and development traits in interaction with the pathogen. Methods for isolating and identifying fungi, preparing culture filtrates, infecting plants, morphometric, and statistical data processing were applied. Treatment of common wheat grains with culture filtrates of 9 F. oxysporum isolates, demonstrated their different virulence, which allowed their successful classification into clusters with different pathogenic potential. Factorial analysis of the weight of plant genotype, F. oxysporum isolate and their interaction in the source of variation of growth characters demonstrated that the genotype recorded: 48 ... 63%, the isolate factor: 17 ... 23%, the genotype x isolate interaction - 11 ... 23%. Relatively high values were recorded for the heritability coefficient in the broad sense (0.53 ... 0.69) and genetic advantage (13.39 ... 24.74%) for growth and development traits in the interaction of common wheat with F. oxysporum isolates, which reveals the high opportunities for creating resistant wheat genotypes in limited terms.