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Determination of the Absorption, Translocation, and Distribution of Imidacloprid in Wheat
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Sources of Stem Rust Resistance in Wheat-Alien Introgression Lines
Mahbubjon Rahmatov1, Matthew N Rouse2, Brian J Steffenson3
1Department of Plant Breeding, Swedish University of Agricultural Sciences, SE-23053 Alnarp, Sweden; Department of Plant Pathology, University of Minnesota, St. Paul 55108; and Tajik Agrarian University, Dushanbe, 734017, Tajikistan.
Plant Disease
|January 26, 2019
Summary
Scientists identified new stem rust resistance genes in wheat derivatives from alien species. These novel genes, sourced from rye and other grasses, are crucial for improving wheat
Area of Science:
- Plant Pathology
- Genetics
- Agronomy
Background:
- Stem rust, caused by virulent pathogen races like Ug99, poses a significant threat to global wheat production.
- Enhancing genetic resistance diversity in wheat is critical to combat devastating crop diseases.
Purpose of the Study:
- Identify novel stem rust resistance sources in wheat-alien introgression derivatives.
- Postulate and verify resistance genes from *Secale cereale*, *Leymus mollis*, *L. racemosus*, and *Thinopyrum junceiforme*.
- Introduce new resistance genes to bolster wheat's defense against prevalent pathogen lineages.
Main Methods:
- Seedling and field-based resistance screening of wheat-alien introgression lines.
- Genomic in situ hybridization (GISH) for chromosomal verification.
- Molecular marker analysis to confirm gene presence and introgression.
Main Results:
- Seven known stem rust resistance genes (Sr7b, Sr8a, Sr9d, Sr10, Sr31, Sr36, SrSatu) were postulated in introgression lines.
- Several wheat-rye substitution lines (e.g., SLU210, SLU238, SLU239) exhibited unique resistance patterns, suggesting novel resistance genes.
- Chromosomal verification confirmed introgressions from alien species into wheat, particularly involving B and D chromosomes.
Conclusions:
- Novel stem rust resistance genes were identified from diverse alien introgressions in wheat.
- These findings provide valuable genetic resources for breeding wheat varieties with enhanced resistance to devastating stem rust races.
- The study contributes to diversifying wheat's resistance gene pool against evolving pathogens like the Ug99 lineage.
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