Study of the species composition and population structure of winter wheat leaf blotch pathogens in the central chernozem region of the Russian Federation

Yu.V Zeleneva,V.P Sudnikova,E Renev,R Changzhong,G Batalova,Y Shavrokov,V Romanyuk

doi:10.1051/bioconf/20213601014

Abstract

For the period of 2020, the species composition of winter wheat leaf blotch pathogens on the territory of the Central Chernozem region was studied. It is shown that the Zymoseptoria tritici species dominates in the pathogenic complex during all phases of wheat vegetation. Under the conditions of the year, the other two species - the pathogen of the disease: Parastagonospora nodorum and Parastagonospora avenae f. sp. triticea had no economic significance. The populations of the species Zymoseptoria tritici, formed on winter and spring wheat cultivats according to morphological, physiological and pathogenic properties, were studied. It is shown that black corrugated colonies with an average growth rate and high sporulation predominate. Using monogenic lines, virulence phenotypes were determined in isolates taken from infectious wheat material. Seven virulence phenotypes were identified. All isolates hit the test lines from 2 to 4 points, therefore they were characterized by wide virulence and high aggressiveness. The information obtained is necessary for the development of a methodology for resistance breeding.

Highlights

An increase in grain production is possible if losses from environmental stress factors are reduced
We have shown that the warm temperature regime of May and April has a positive effect on the frequency of the species Zymoseptoria tritici
The pathogenic properties of the isolates of Zymoseptoria tritici were determined on a set of test cultivars: Mironovskaya 808, Kharkovskaya 46, Orenburgskaya 10, Prokhorovka, Bezenchukskaya 182, Bezenchukskaya 200 virulence on monogenic lines Stb1, Stb2, Stb3, Stb4, Stb5, Stb7 [23]

Summary

Introduction

An increase in grain production is possible if losses from environmental stress factors are reduced. In zones favorable for the cultivation of grain crops, the main harm is usually caused by pathogens. The composition of their pathogenic complexes is not the same in different regions. In the grain agrophytocenosis of the CCR, among the diseases that limit the receipt of a consistently high yield by years and profitability of grain production are (in descending order of harmfulness) septoria spots, brown rust, head smut of wheat, helminthosporium diseases and barley smut.

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