Abstract
Nowadays, a large number of cultivars of various origins are attracted to the wheat breeding improvement, and as a result, an assessment of the accessions’ yield in various agroclimatic conditions isrequired. Genotype-environment interaction is the main reason for the fact that in different years and (or)in other conditions of cultivation, cultivars and lines differ in rank according to the level of the yield. Thestudy aims to investigate the suitability and adaptability of accessions of world tetraploid wheat collection, including durum wheat cultivars, to the Kazakhstan conditions. Three hundred twenty-eight (328)tetraploid wheat accessions of different genetic and geographical origin were grown in 2 randomizedreplicates in two contrasting regions of Kazakhstan – Kostanay region on the North and Almaty regionon the South-east of the country. Phenological observations and structural analysis were conductedfollowing Dospekhov and the Zadoks scale. Correlations coefficients among all characters (days to tillering, days to booting, days to heading, days to anthesis, days to maturity, plant height, peduncle length,number of fertile spikes per plant, spike length, number of kernels per spike, weight of kernels per spike,number of kernels per plant, 1000 kernels weight) were computed using GraphPad software. To assessthe contribution of genotypic and environmental variability to the total phenotypic variation of yield andthe main economically valuable traits, we evaluated the genotype-environment interaction. Productiveand adapted accessions for the both Almaty and Kostanay regions were selected. The data of phenological observations and structural analysis will be used in a genome-wide association study for the traits,related to productivity and quality.Key words: tetraploid wheat, cultivar, yield, phenology, pre-breeding, genotype x environment interaction.