Agronomic performance of common wheat nested association mapping (NAM) population in Kazakhstan

Abstract

Ключевые слова: мягкая пшеница, экологические испытания, взаимодействие генотип × средa, гнездовое ассоциативное картирование (NAM), компоненты урожайности, урожайность.

In this study, we evaluated 326 recombinant inbred lines (RILs) of Nested Association Mapping (NAM) population from the UK. The population derived from 24 families, where common parent was “Paragon” one of the standards of spring wheat cultivars in UK. All 326 RILs were tested in the experimental station of the Kazakh Research Institute of Agriculture and Plant growing (southeast of Kazakhstan) in 2019 and 2020 years. The studied traits are divided into two groups: plant adaptation-related traits (flowering time, seed maturation time, plant height) and yield components (number of productive spikes, spikes length, number of kernels per spike (NKS), weight of kernels per the main spike, weight of kernels per plant, thousand kernels weight (TKW), yield per m2(YM2)). The Pearson correlation index showed a positive correlation between yield-related traits with YM2. The principal component analysis divided 326 RILs using PC1 (51.3%) and PC2 (23.1%). It appears that TKW and NKS in the graph were forwarded in alternative directions. The result confirmed a negative correlation between NKS and TKW. The 31 RILs of NAM population exceeded the check cultivar Kazakhstanskaya 4, including those six RILs (NAM-88, NAM-129, NAM-183, NAM-300, NAM-295, NAM-326) that showed averaged best yield values over the two years. The variance analysis showed that genotype × environment interaction affected the studied traits of the NAM population in Kazakhstan’s conditions. The results of the studies will be used for further studies related to adaptation and productivity of wheat in the breeding program and genome-wide association study for yield and yield-related traits in bread wheat.

Key words: bread wheat, ecological trials, genotype × environment interaction, Nested Association Mapping (NAM), yield components, yield.