Interaction of consorts in agrocenoses of spring wheat in Western Siberia

E. Yu. Toropova^1, 2, G. Ya. Stetsov^3, 4, I.G. Vorob’eva^5, 2,V. Yu. Sukhomlinov^1
1Novosibirsk State Agrarian University, ul. Dobrolyubova, 160, Novosibirsk, 630039, Russian Federation
²All-Russian Research Institute of Phytopathology, ul. Institut, vl. 5, r.p. Bol’shie Vyazemy, Odintsovskii r-n, Moskovskaya obl.,143050, Russian Federation
³Federal Altai Scientific Center of Agrobiotechnologies, Nauchnyi gorodok, 35, Barnaul, 656910, Russian Federation
⁴Altay State University, prospect Lenina, 61, Barnaul, 656049, Russian Federation
⁵Central Siberian Botanical Garden, Siberian branch, Russian Academy of Sciences, ul. Zolotodolinskaya, 101, Novosibirsk, 630090, Russian Federation

Abstract. The studies were conducted in 2013–2020 in the forest-steppe zone of Western Siberia. The purpose was to identify the interactions of spring wheat consorts and their combined effect on the phytosanitary state of crops. Records and observations of phytopathogens, phytophages, and weeds were conducted by conventional methods. The pathogenic complex of spring wheat root rot was the result of the interaction of soil micromycetes-consorts with the edificator plant and among themselves in time and space. Because of this interaction, the occurrence of species in the pathogenic complex of root rot during the growing season changed: by harvesting the proportion of B. sorokiniana decreased by 7 times; the proportion of fungi of the genus Fusarium increased up to 2.2 times with a simultaneous expansion of their species composition. The affection of plants by root rot above the biological threshold of harmfulness increased the development of brown rust 1.9–3.1 times; powdery mildew developed 2.6–3.4 times quicker; the development of leaf Septoria enhanced by 16.8–31.4%. The edificatory function of spring wheat in the rhizosphere was manifested both in the direct influence of plants on phytopathogenic micromycetes through resistance or susceptibility and the induction of antagonist suppressors. Topical connections of cereal flies with soil phytopathogens were expressed in a sharp increase in the pathogenesis of root rot. The correlation coefficients between the development of root rot and the colonization of stems by pests were high (5%) and statistically significant. The correlation coefficient was up to 0.856 ± 0.136. Weed species of autotrophs significantly (at a level of 5%), increased the affection of spring wheat by root rot as a result of direct oppression by 16.1%. The coefficient of the community of species composition of Fusarium fungi in seeds of cereal weeds and underground parts of spring wheat was 0.62.

Keywords: wheat; agrocenosis; consort; phytopathogen; phytophagous; weed.

Author Details: E. Yu. Toropova, D. Sc. (Biol.), prof., head of laboratory; G. Ya. Stetsov, D. Sc. (Agr.), leading research fellow, prof.; I. G. Vorob’eva, D. Sc. (Biol.), leading research fellow; V. Yu. Sukhomlinov, postgraduate student (е-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.).

For citation: Toropova EYu, Stetsov GYa, Vorob’eva IG, et al. [Interaction of consorts in agrocenoses of spring wheat in Western Siberia]. Dostizheniya nauki i tekhniki APK. 2020;34(9):35-41. Russian. doi: 10.24411/0235-2451-2020-10907.