VIRULENCE AND RACIAL COMPOSITION OF PUCCINIA TRITICINA IN KAZAKHSTAN IN 2018

Abstract

To determine the racial composition of leaf rust, 85 single pustule isolates of the pathogen were isolated from Altai, Karabalykskaya 92, Augustina, Omskaya 36 wheat varieties, which are widely used in different regionsof Kazakhstan. As a result, lines with genes Lr9, Lr19, Lr24, Lr25 and Lr29 were most effective for leaf rust in various ecological zones of the republic. Twenty-five races of wheat leaf rust pathogens have been found with varying frequency and virulence. TGTGT and TQTGT races of the pathogen were found in all regions of Kazakhstan. Mainly unique races (TRTJT, TRTHT, THTHT, and THTQT) characterized a wide range of virulence. Virulence and racial composition of Kazakhstani populations of P. triticina were characterized via descriptive statistical methods. The results of statistical analysis showed that in the Karabalyk
and Kostanay regions, the genetic structure, racial composition and development of the pathogen of leaf rust populations found in wheat fields are uniform. However, there are significant differences between the populations of northern and eastern Kazakhstan. This may be due to the diversity of crop, geographical differences and climatic conditions in these regions. The results of the study can be used effectively in the breeding of wheat for leaf rust and phytopathology researches