Genetics of Rust Resistance in a Wheat Nested Association Mapping Population

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Genetics of Rust Resistance in a Wheat Nested Association Mapping Population

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Manan, Fazal

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2017-10

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Abstract

Wheat is an important food crop in many parts of the world, but its genetic diversity has been eroded due to intense selection in breeding programs. To increase genetic diversity in the Minnesota wheat breeding program, a nested association mapping population was developed by crossing 25 exotic accessions selected from the USDA-ARS Spring Wheat Core Collection with RB07, a Minnesota cultivar selected as the common parent because it has wide adaptation in the region. Virulent races of the stem rust (Puccinia graminis f. sp. tritici, Pgt), leaf rust (P. triticina, Pt), and stripe rust (P. striiformis f. sp. tritici, Pst) pathogens threaten the wheat crop in the region. Thus, the objective of this thesis was to elucidate the genetics of rust resistance in select families of the Minnesota Nested Association Mapping Population (MNAMP) based on qualitative (chi-square tests of Mendelian gene models) and quantitative (quantitative trait loci (QTL) mapping with 66,685 single nucleotide polymorphic markers) genetic analyses. Four families segregated for resistance to the widely virulent Pgt races of TTKSK, TRTTF, and TTKST. One to five Mendelian genes and five to 19 QTL conferred stem rust resistance in individual families. One family segregated for resistance to Pt race TFBGQ with Lr21 virulence. One Mendelian gene and two QTL controlled resistance to this pathogen race. Three families segregated for resistance to the Pst races PSTv-37 and PSTv-40. Three to five Mendelian genes and two to 12 QTL conferred resistance to these races in individual families. Rust resistant progeny identified from the MNAMP will be useful for enhancing the resistance of wheat to the three rust diseases.

Keywords

Plant pathology

Association

Diversity

Mapping

QTL

Rust

Wheat

Description

University of Minnesota M.S. thesis. October 2017. Major: Plant Pathology. Advisor: Brian J. Steffenson. 1 computer file (PDF); ix, 144 pages.

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Manan, Fazal. (2017). Genetics of Rust Resistance in a Wheat Nested Association Mapping Population. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/201506.

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