Abstract
The study is devoted to the analysis of the correlation of morphological and cultural characteristics and virulence of Pyrenophora teres Drechs. isolates, and various resistance to the pathogen of barley varieties (Versal, Kubagro-1, Romance). The main morphological types of colonies of the fungus isolates obtained from the barley varieties with different resistance were determined. It was found that the higher degree of resistance of the variety, the faster growth rate of colonies, the intensity of sporulation and heterogeneity of the population on the basis of virulence increase. The most common races were detected in the populations of P. teres isolated from different varieties of barley. We found that the selection for the virulence of the pathogen population in Versal variety with a high level of non-specific resistance was carried out with a wider spectrum of diversity.
Highlights
The cultivation of cereals on an industrial scale involves complex protection against diseases caused by phytopathogens
We revealed significant differences in the growth rate of isolate colonies collected from the barley varieties differing in resistance to the pathogen (Table 1)
We found that the pathogen population isolated from the moderately susceptible Kubagro-1 variety (25.0 %) had the highest virulence and the fungus population from the highly susceptible Romance variety had the smallest virulence (16.7 %)
Summary
The cultivation of cereals on an industrial scale involves complex protection against diseases caused by phytopathogens. Hemibiotrophic parasites are under the special control due to the widespread increase in their harmfulness in recent decades. The main barley (Hordeum vulgare L.) disease worldwide is net blotch caused by ascomycete Pyrenophora teres Drechs. The expansion of the range of P. teres specialization in parasitization on wheat (Triticum aestivum L.) [2, 3] is of a particular concern. Barley is one of the most important crops of the agro-industrial complex, occupying the fourth place among the most cultivated cereal crops and one of the main types of grain products sold by Russia. In the Southern Federal District of the Russian Federation, barley net blotch is the most harmful and dangerous disease [4]
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