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Genome-wide association study of Septoria tritici Blotch resistance in Ethiopian durum wheat landraces

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Title Genome-wide association study of Septoria tritici Blotch resistance in Ethiopian durum wheat landraces
 
Creator Kidane, Yosef Gebrehawaryat
Hailemariam, B.N.
Mengistu, D.K.
Fadda, Carlo
Pe, M.E.
Dell'Acqua, M.
 
Subject fungal diseases
hard wheat
land races
quantitiative trait loci
disease resistance
 
Description Septoria tritici blotch (STB) is a devastating fungal disease affecting durum and bread wheat cultivation worldwide. The identification, development, and employment of resistant wheat genetic material is the key to overcoming costs and limitations of fungicide treatments. The search for resistance sources in untapped genetic material may speed up the deployment of STB genetic resistance in the field. Ethiopian durum wheat landraces represent a valuable source of such diversity. In this study, 300 Ethiopian wheat genotypes, for the most part traditional landraces, were phenotyped for resistance to different aspects of STB infection. Phenology, yield and yield component traits were concurrently measured the collection. Here we describe the distribution of STB resistance traits in modern varieties and in landraces, and the relation existing between STB resistance and other agronomic traits. STB resistance sources were found in landraces as well as in modern varieties tested, suggesting the presence of alleles of breeding relevance. The genetic material was genotyped with more than 16 thousand genome-wide polymorphic markers to describe the linkage disequilibrium and genetic structure existing within the panel of genotypes, and a genome-wide association (GWA) study was run to allow the identification of genomic loci involved in STB resistance. High diversity and low genetic structure in the panel allowed high efficiency GWA. The GWA scan detected five major putative QTL for STB resistance, only partially overlapping those already reported in the wheat literature. We report four putative loci for Septoria resistance with no match in previous literature: two highly significant ones on Chr 3A and 5A, and two suggestive ones on Chr 4B and 5B. Markers underlying these QTL explained as much as 10% of the phenotypic variance for disease resistance. We found three cases in which putative QTL for agronomic traits overlapped marker trait association deriving from STB GWA. Our results show that the Ethiopian untapped allelic diversity bears a great value in studying the molecular basis of STB resistance and in breeding for resistance in local and international material.
 
Date 2017-09-14
2017-12-30T15:20:05Z
2017-12-30T15:20:05Z
 
Type Journal Article
 
Identifier Kidane,Y.G.; Hailemariam, B.N.; Mengistu, D.K.; Fadda, C.; Pe, M.E.; Dell'Acqua, M. (2017) Genome-wide association study of Septoria tritici Blotch resistance in Ethiopian durum wheat landraces. Frontiers in Plant Science 8: article 1586. ISSN: 1664-462X
1664-462X
https://hdl.handle.net/10568/89860
https://doi.org/10.3389/fpls.2017.01586
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 12 p.
application/pdf
 
Publisher Frontiers Media
 
Source Frontiers in Plant Science