THE ENVIRONMENTAL TESTING ROLE AS A DECISIVE FACTOR IN EVALUATING NEW SPRING SOFT WHEAT VARIETY AIST 45

The purpose of research is to evaluate a new variety of spring soft wheat Aist 45 based on data from the analysis of yield, plasticity, grain quality, disease resistance for widespread introduction into produc-tion and use as a starting material in breeding. The object of the study is a new variety of spring soft wheat Aist 45. The predecessor is fallow, provocative backgrounds were additionally used: sowing on stubble and late sowing (the first ten days of June). The sowing date is the end of the 2nd and 3rd dec-ades of May. Assessments of resistance to diseases on artificial backgrounds were carried out at the All-Russian Institute of Plant Protection, All-Russian Research Institute of Phytopathology, Kenya under the KASIB program. Tests for economic usefulness – in the system of state variety testing. Observations and evaluations – in accordance with the Methodology of the state variety testing. The studies were carried out at the Kurgan Research Institute of Agriculture, a branch of the FGBNU Ural Federal Agrarian Re-search Center of the Ural Branch of the Russian Academy of Sciences. A test of the Aist 45 variety in breeding nurseries (2011–2021) showed an excess of yield over the mid-season and mid-late standards by 4.4 and 2.8 q/ha. In an ecological test of 52 varieties in 16 points of Russia and Kazakhstan (KASIB, 2017–2018), Aist 45 had a high yield rating, according to the results of technological analysis, the protein content was 15.7–16.3 %, gluten in grain was 31.6–32.4 %. The variety is classified as a valuable wheat. When assessed for resistance to leaf rust against an artificial background in the seedling phase in the studies of the All-Russian Institute of Plant Protection and All-Russian Research Institute of Phytopathol-ogy, the variety Aist 45 was assigned to the resistant type. Against the infectious background of the Re-search Institute of Biological Safety Problems of South Kazakhstan, the variety showed resistance to sep-toria and pyrenophorosis. It is susceptible to dust smut. The variety is able to form a stable crop in stress-ful drought conditions and with epiphytotic development of brown and stem rust. This makes it promising for use both in production and as a starting material in breeding.