Root rot on spring wheat varieties in the ob region northern forest-steppe

Breeding of spring wheat varieties resistant to soil phytopathogens is a complex and urgent task of breeding. The the research aim was to assess the spring wheat varieties on the root rot damage and the impact on the soil pathogens population. During the research the following tasks were performed: the root rot development analysis on underground organs of 12 spring wheat varieties, the varietal disease etiology was clarified, the B. sorokinana conidia number in the varieties rhizosphere soil was determined. The studies were conducted at the Institute of Cytology and genetics breeding site the in the Ob region Northern forest-steppe. Studies have not revealed the immune and highly resistant to Fusarium-Helminthosporium root rot forms among the studied varieties. All varieties were affected above the biological harmfulness threshold, but the differences in the disease development reached 1.7 times. The Fusarium fungi dominance in the root rot pathocomplex was revealed in most varieties. The variety Siberian 17 was identified, which showed a lower complex susceptibility to Fusarium-Helminthosporium root rot, it had uninfected by pathogens roots and moderately infected the stem bases. It was The resistance to common and Fusarium root rot differential expression was revealed: Fusarium root rot relative resistance variety Manu showed, and to Helminthosporium one - Remus. The number of B. sorokiniana conidia in the rhizosphere soil was determined by varieties. The most intensive phytopathogen propagation was identified under the variety Novosibirskaya 15, the conidia number had reached 34 harmfulness thresholds there. Significantly, to 3.6 times less phytopathogen propagation was marked on the Tone and Manu varieties. The varieties influenced the B. sorokiniana conidia viability: the correlation coefficient between the conidia total number in the varieties rhizosphere soil and the degraded ones proportion was r = 0.864±169 (P < 0.01).

яровая пшеница, сорт, устойчивость, корневая гниль, конидия, этиология, spring wheat, variety, resistance, root rot, conidia, etiology