INHERITANCE OF POWDERY MILDEW RESISTANCE IN SELECTED SPRING BREAD WHEAT ACCESSIONS FROM THE VIR COLLECTION

Background. Powdery mildew, caused by Вlumeria graminis (DC.) Speer f. sp. tritici Marchal (Bgt), is one of the most harmful and widespread disease of cultivated wheat in a cool climate with high humidity. The disease infects the foliage, stem and spike of the wheat host. The most economical and environmentally safe method for controlling Bgt is to develop resistant bread wheat cultivars. Up to now, more than 60 genes for resistance to powdery mildew have been identified in wheat. Searching for new effective genes of resistance and introducing them into cultivars is an essential stage of plant breeding for resistance. The aim of our study was to identify wheat accessions resistant to powdery mildew and study their inheritance pattern. Materials and methods. Inheritance of powdery mildew resistance was studied in eight accessions of spring bread wheat held by VIR: k-64433, k-64434, k-64436, k-64997, k-64998, k-65257, k-65449 and k- 65454. Their plants were inoculated in the seedling phase with the Bgt inoculant collected on the field. The population of the fungus was virulent to genes Pm1, Pm2, Pm3 a - d, Pm4 a - b, Pm5, Pm6, Pm7, Pm8, Pm10, Pm11, Pm17 and Pm19, but avirulent to Pm12, PmKu and PmSp. To determine the resistance inheritance pattern and the number of resistance genes, the accessions were crossed with susceptible wheat's resistant lines ‘Wembley 14.31' (Pm12) and ‘Lutescens 13' (PmKu). The parents and F₁-F₂ progenies were inoculated with the Bgt population. A chi-square test was used to analyze the fit between the observed and theoretically predicted segregations. Results and conclusion. Bgt resistance in the studied accessions in their seedling phase was found to be controlled by a single dominant gene. None of them had the dominant Pm12 allele. The group of cultivars from Sweden was protected by the same Pm-gene. The group of Russian cultivars had allelic genes for powdery mildew resistance. The dominant allele PmKu did not protect the accessions k-64433, k-64434, k-64436 and k-65257 from the disease.

яровая мягкая пшеница, мучнистая роса (Blumeria graminis), наследование, гены устойчивости, коллекция ВИР, spring bread wheat, powdery mildew (Blumeria graminis), inheritance, genes for resistance, the VIR collection

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