O. A. Kudinova, O. F. Vaganova, V. D. Agapova, G. V. Volkova
Federal Scientific Center for Biological Plant Protection, Krasnodar, p/o 39, 350039, Russian Federation
Abstract. The work assessed the influence of abiotic factors of two agroclimatic zones of the North Caucasus on the virulence and phenotypic diversity of the P. triticina population. The work was performed in 2020 in a greenhouse and artificial climate chamber of the Federal Scientific Centre for Biological Plant Protection. Infectious material of P. triticina was collected as a result of route surveys of production and breeding crops of the susceptible winter wheat variety Grom in central and western Cis-Azov agroclimatic zones of the North Caucasus region. The meteorological conditions in the 2020 growing season were extremely unfavourable for the development of leaf rust in the region. We analyzed the virulence of 19 isolates of the pathogen from the central zone and 16 isolates from the western Cis-Azov zone. As a result, we identified 18 and 14 fungus phenotypes, respectively. The incidence of isolates virulent to most lines with Lr genes (Lr 1, 2c, 3, 16, 26, 3ka, 11, 17, 30, B, 10, 14a, 18, 14b, 21, 23, 25, 28, 33, 34, 36, 40, and Kanr) varied from 80% to 100%. No virulent isolates were found for lines with genes Lr15, Lr41, Lr42, and Lr43 in both zones. In populations from both zones, we found isolates virulent to Lr9 and Lr24 genes. The phenotypic diversity of the populations according to the Shannon index for the central (Sh = 0.95) and western Azov (Sh = 0.87) agroclimatic zones was significant. Both populations were distinguished by the predominance of virulent phenotypes of the T-group, which is associated with the influence of the genotype of the susceptible variety. At the same time, we did not find any significant differences in the Ney index for the incidence of virulence genes for both populations (N = 0.017), which is due to the geographical proximity of the two zones, as well as similar sums of temperature and precipitation.
Keywords: brown rust (Puccinia triticina); wheat; variety; population; agroclimatic zone; virulence; phenotypes.
Author Details: O. A. Kudinova, Cand. Sc. (Biol.), senior research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); O. F. Vaganova, research fellow; V. D. Agapova, junior research fellow, G. V. Volkova, D. Sc. (Biol.), сhief research fellow, head of laboratory.
For citation: Kudinova OA, Vaganova OF, Agapova VD, et al. [Virulence and phenotypic composition of Puccinia triticina in agroclimatic zones of the North Caucasus]. Dostizheniya nauki i tekhniki APK. 2021;35(7):23-8. Russian. doi: 10.53859/02352451_2021_35_7_23.