Identification of sources of resistance to septoria in genotypes of winter triticale in natural field conditions of the republic of Moldova

Presented are the results of studying the inheritance of the phenotypic reaction in reciprocal F₁ and F₂ winter triticale hybrids (x Triticosecale Wittm.) on a natural infectious background for septoria in climatic conditions of the Republic of Moldova are presented. The aim of this work was to identify sources of resistance among the genotypes of local triticale that are well adapted to septoria and study of the genetic control of the trait. The reaction of reciprocal F₁ and F₂ hybrids on susceptibility of septoria varied in the range of 0.1-3.1 points and 0-2.8 points, respectively. It has been established that the resistance of triticale to Septoria tritici can be both dominant and recessive, depending on the response of the parental genotypes and the direction of the crossing. The overdominance of S. tritici resistance was manifested in F₁ hybrids from reciprocal crossing of resistant genotypes (Podoima/Talovscaia 12 and Ingen 40). In the less favorable climatic conditions for the development of the disease (2017), F₂ hybrids obtained from crosses of the Podoima /Talovscaia 12, Ingen 40 and Ingen 93 genotypes manifested tolerance. A significant positive correlation (r = 0.52, p < 0.05) was established between the degrees of susceptibility shown in F1 and F₂ hybrids. When creating varieties resistant to septoria and winter triticale lines, it is recommended to use adapted and less affected against the natural infectious background resistance donors Ingen 40 and Podoima /Talovscaia 12.

генотип, озимые тритикале, реципрокные скрещивания, гибриды F₁, F₂, септориоз, устойчивость, степень доминирования, Genotypes, winter triticale, reciprocal combination, hybrids F₁, F₂, leaf septoriasis, resistance, degree of dominance