Identification of Stem Rust Resistance Genes in the Winter Wheat Collection from Southern Russia

Abstract

The high yield potential of winter wheats cannot be realized due to disease pressure under field conditions. One of the most harmful of such diseases is stem rust, hence the constant search for sources of resistance and the development of new varieties resistant to stem rust is of great relevance. This study deals with the identification of stem rust resistance genes in a collection of winter wheats grown in Southern Russia. This genepool has not been studied yet. A total of 620 samples of winter soft wheat from various ecological and geographical zones were tested under field conditions. To identify the specific genes or alleles responsible for resistance, all samples were genotyped using PCR. As a result, the groups of resistant samples, carrying the Sr2, Sr31, Sr38 and Sr44 genes in various combinations, were identified. Most of the stem rust resistance was provided by the presence of the effective Sr44 gene. This information can be used in the future breeding work for stem rust resistance.

Identification and Validation of High LD Hotspot Genomic Regions Harboring Stem Rust Resistant Genes on 1B, 2A (Sr38), and 7B Chromosomes in Wheat

“…While 10 markers were in common between the two studies, the other seven SNP makers in Mourad et al (2019) were found in the raw sequence data of our study but they were excluding after marker filtration. Consequently, we can say that in the Nebraska wheat breeding program, the Sr38 stem rust resistance gene remains a broadly used and effective resistance gene to the QFCSC local strain (Alabushev et al, 2019;Mourad et al, 2019). The other remaining SNPs (42) located on the 2A chromosome in this study were far from those detected by Mourad et al (2019).…”

Diversity of stem rust resistance in modern Siberian bread wheat (Triticum aestivum) germplasm

“…The combination of the Sr31 / Lr26 and Sr25 / Lr19 genes was identified in 26.3% of the lines and wheat varieties cultivated in the Volga region (Baranova et al, 2019). An extensive collection of the Donskoy Agricultural Research Center, consisting of 620 varieties of winter bread wheat from various ecological and geographical zones, was screened for resistance genes (Alabushev et al, 2019). Groups of resistant samples carrying genes Sr2 , Sr31 , Sr38 and Sr44 in various combinations were identified.…”