Assessment of spring broad wheat varieties and lines for drought resistance in the conditions of the southern foreststeppe of Western Siberia using drought resistance indices

Abstract

The experimental part of the work was carried out based on the seed production department of the Omsk Agrarian Research Center in 2020-2022. Breeding lines of spring soft wheat were represented by three ripeness groups: mid-early – G 6/17, G 8/17, G 10/17; mid-season - G 7/17, G 15/17, G 16/17 and mid-late - G 11/17, G 14/17, G 17/17. The varieties Pamyati Azieva, Duet, and Element 22 were standard. A complex system of indices was used to evaluate the samples for drought resistance, based on comparison of yields under stressful and favorable conditions. The most common indices were calculated: average productivity (MP), endurance index (TOL), yield stability index (YSI), drought resistance index (DI), and stress intolerance index (STI). The total rank score for all indices was calculated. Based on estimating a set of drought resistance indices, five samples with the highest number of points were identified: G 6/17, G 7/17, G10/17, G 11/17, and G 15/17, which can be used in further selection. The calculation of correlation coefficients revealed a high positive relationship between average productivity and the stress tolerance index (0.99), as well as the yield stability index (0.73), between the endurance index and the drought resistance index (0.89). A close positive relationship was also established between the stability and stress tolerance indexes (0.76), indicating a relatively high reliability.