Identifying QTLs for cold-induced resistance to Microdochium nivale in winter triticale

Abstract

Snow mould caused by Microdochium nivale (Fr.) Samuels & Hallett is the most widespread seedling disease in winter cereals. Due to the complexity of the resistance mechanisms, a poorly understood genetic background and strong interaction with winter weather conditions, it is difficult to assess the resistance of triticale cultivars via conventional inoculation methods. Genetic resistance is the most economical and environmental friendly way to control M. nivale infection; therefore, the objective of this study was to detect the quantitative trait loci (QTLs) associated with resistance components of winter triticale in a mapping population derived from a cross of the ‘Modus’ (partly resistant) and ‘SaKa 3006’ (sensitive) varieties. High-resolution mapping was conducted by using 1518 molecular markers (diversity arrays technology, simple sequence repeat and amplified fragment length polymorphism). Partial resistance components assessed in this study, i.e. candidate QTLs, were detected on chromosomes 1B, 2A, 3A, 3B, 5A, 5B, 6A, 6B and 7B, whereas QTLs describing overall seedling vitality in non-infected control plants were located on chromosomes 1B, 2B, 3A, 5A, 7B and 7R.

The effects of cold-hardening and Microdochium nivale infection on oxidative stress and antioxidative protection of the two contrasting genotypes of winter triticale

“…), a man-made hybrid crop [2] with great yielding potential particularly in severe culture conditions. Variable levels of M. nivale infection in triticale were reported from field experiments and from testing at control 1 3 conditions [3][4][5], but no fully resistant genotype was found. The fungicides used so far against M. nivale are very harmful to the environment and not sufficiently effective [6][7][8].…”

“…The fungicides used so far against M. nivale are very harmful to the environment and not sufficiently effective [6][7][8]. Only cold-hardening is regularly reported to induce increased resistance against pink snow mould [4,5,[9][10][11][12][13][14], but its effect is genotype-dependent.…”

Identification of QTLs associated with albino plant formation and some new facts concerning green versus albino ratio determinants in triticale (×Triticosecale Wittm.) anther culture

“…'Saka 3006' and 'Modus' was used for identification of QTLs associated with albino plant production by anther culture method. The same mapping population together with produced for it well-saturated genetic linkage map (Tyrka et al 2011) was successfully used in several previous studies Szechynska-Hebda et al 2011;_ Zur et al 2012). Among others, the QTLs associated with androgenic structure formation and green plant regeneration has been identified .…”

Cold-Enhanced gene expression of the foliar thiolspecific antioxidant protein in Triticaie (x Triticosecale Wittm.) seedlings resistant to Microdochium Nivale (Samuels & I.C. Hallett) infection

“…In our previous studies we have shown that a cold-hardening treatment induces the resistance of winter triticale to the infection of m. nivale (Gołębiowska, Wędzony 2009;Gołębiowska et al 2011;Dubas et al 2011;Szechyńska-Hebda et al 2011;Żur et al 2013). Without hardening, seedlings of studied triticale cultivars: Hewo and Magnat were completely damaged by m. nivale mycelium.…”