1. Nitrogen deficiency tolerance conferred by introgression of a QTL derived from wild emmer into bread wheat.
- Author
-
Govta, Nikolai, Fatiukha, Andrii, Govta, Liubov, Pozniak, Curtis, Distelfeld, Assaf, Fahima, Tzion, Beckles, Diane, and Krugman, Tamar
- Subjects
Triticum ,Quantitative Trait Loci ,Nitrogen ,Phenotype ,Genetic Introgression ,Chromosome Mapping ,Stress ,Physiological ,Droughts ,Chromosomes ,Plant - Abstract
Genetic dissection of a QTL from wild emmer wheat, QGpc.huj.uh-5B.2, introgressed into bread wheat, identified candidate genes associated with tolerance to nitrogen deficiency, and potentially useful for improving nitrogen-use efficiency. Nitrogen (N) is an important macronutrient critical to wheat growth and development; its deficiency is one of the main factors causing reductions in grain yield and quality. N availability is significantly affected by drought or flooding, that are dependent on additional factors including soil type or duration and severity of stress. In a previous study, we identified a high grain protein content QTL (QGpc.huj.uh-5B.2) derived from the 5B chromosome of wild emmer wheat, that showed a higher proportion of explained variation under water-stress conditions. We hypothesized that this QTL is associated with tolerance to N deficiency as a possible mechanism underlying the higher effect under stress. To validate this hypothesis, we introgressed the QTL into the elite bread wheat var. Ruta, and showed that under N-deficient field conditions the introgression IL99 had a 33% increase in GPC (p
- Published
- 2024