Using breeding indices for evaluating collection samples of spring barley Hordeum vulgare L.

The article presents experimental data on determination of adaptive properties and productivity of Hordeum vulgare L. ssp. distichon (L.) Körn. and H. vulgare L. ssp. vulgare samples of different ecological and geographical origin on the basis of breeding indices. Under contrasting conditions of the growing seasons, 2022 and 2023, 35 samples were studied for elements of grain productivity (ear length, number of grains in the ear and their weight, plant height). The field study was carried out at the experimental site of the biostation University of Tyumen “Lake Kuchak” (Nizhnetavdinsky District, Tyumen Province). The evaluation of productivity in the relationship “genotype — environment” showed that the following breeding indices are the most informative: Canadian, Mexican, linear ear density, plant productivity. On the basis of point ranking on the complex of indices, the best samples were: Zernogradsky 813, k-30453, Abalak, k-31201, Russia; Knezsa 65, k-22809, Hungary (var. erectum , nutans ); Rokkaku-yabane, k-10986, Japan (var. brachyatherum ). Higher yields were obtained under relatively favorable growing conditions in 2022, up to 439.8 g/m 2 for double-row and up to 454.8 g/m 2 for multi-row barley accessions; under stress conditions, up to 455.4 and 218.1 g/m 2 , respectively. Under stress conditions in 2023 compared to 2022, the multi-row barley samples showed an increase in the strength of correlation of yield with Canadian index ( r = 0.73), plant productivity index (r = 0.66), linear ear density index ( r = 0.58), Mexican index ( r = 0.52). Two-row samples showed weaker correlation of yield with these indices. The exception was the Mexican index, characterized by a stable correlation coefficient over the years ( r = 0.35).