Genetic variation and genome-wide association analysis of nitrogen use efficiency-related traits under combined heat and nitrogen-deficient stress in an <i>Aegilops tauschii</i>-derived wheat population.

ABSTRACT: Heat stress and nitrogen (N) deficiency increasingly limit global wheat (Triticum aestivum L.) yields, highlighting the need to improve nitrogen use efficiency (NUE) under combined stresses for sustainable production. We assessed 145 multiple-synthetic-derivative (MSD) lines, carrying alleles from diverse Ae. tauschii, crossed and backcrossed into 'Norin 61', together with three checks across six field environments combining heat stress and either optimal (86 kg N ha^-¹; HS-HN) or zero (HS-LN) N supply in central Sudan. Eighteen agronomic and physiological traits were recorded, and best linear unbiased estimates were used for genome-wide association analysis (GWAS) with 31,362 high-quality DArTseq and GRAS-Di markers. HS-LN reduced mean grain yield (GY) and grain N

SUBMITTER: Emam AII 

PROVIDER: S-EPMC12307305 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature