Genetic mapping of quantitative trait loci (QTL) for resistance to septoria tritici blotch in a winter wheat cultivar Liwilla

Radecka-Janusik, Magdalena; Czembor, Paweł

doi:10.1007/s10681-014-1157-6

Cited by 9 publications

(11 citation statements)

References 69 publications

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“…On Chr 3A several significant associations emerged around 71 cM (Table 2 , Figure 4 , Figure S5 ). The putative QTL qSTB.3 is found in a position close to a QTL previously described for resistance to different STB isolates in winter wheat (Eriksen et al, 2003 ; Tabib Ghaffary et al, 2011 ; Radecka-Janusik and Czembor, 2014 ). On the same chromosome, but 55 cM away, lies the resistance gene Stb6 , the most common STB resistance locus in European bread wheat germplasm (Brading et al, 2002 ; Chartrain et al, 2005 ; Arraiano and Brown, 2006 ).…”

Section: Discussionsupporting

confidence: 64%

“…On Chr 2B, a putative QTL was identified at around 85.8 cM (Figure 4 ). Several QTL and meta-QTL for STB resistance were previously reported in the proximity of our putative QTL qSTB.2 (Goudemand et al, 2013 ; Radecka-Janusik and Czembor, 2014 ). This locus is likely co-localized with the resistance gene Stb9 , a major source of STB resistance (Chartrain et al, 2009 ).…”

Section: Discussionsupporting

confidence: 59%

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Genome-Wide Association Study of Septoria tritici Blotch Resistance in Ethiopian Durum Wheat Landraces

et al. 2017

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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, 318 Ethiopian durum 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.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionsupporting

confidence: 59%

Genome-Wide Association Study of Septoria tritici Blotch Resistance in Ethiopian Durum Wheat Landraces

et al. 2017

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“…The Qstb2B_1 QTL identified in the ‘Agili39’/Khiar population likely co-localized with the known major gene Stb9 that was mapped in the French bread wheat cv. Courtot [ 66 ]; with the qSTB.2 QTL mapped in the Ethiopian durum wheat landrace population [ 8 ]; with the QStb.ihar-2B.2 QTL mapped in the Liwilla/Begra bread wheat doubled-haploid population [ 68 ]; and with the QStb.lfl-2B.1 mapped in the eight-founder MAGIC population of winter wheat [ 69 ]. However, the Qstb2B_1 QTL is different from the QTL mapped at the long arm of chromosome 2B in the Nimbus/Stigg bread wheat mapping population [ 67 ].…”

Section: Discussionmentioning

confidence: 99%

Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’

et al. 2022

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Background Septoria tritici blotch (STB), caused by Zymoseptoria tritici (Z. tritici), is an important biotic threat to durum wheat in the entire Mediterranean Basin. Although most durum wheat cultivars are susceptible to Z. tritici, research in STB resistance in durum wheat has been limited. Results In our study, we have identified resistance to a wide array of Z. tritici isolates in the Tunisian durum wheat landrace accession ‘Agili39’. Subsequently, a recombinant inbred population was developed and tested under greenhouse conditions at the seedling stage with eight Z. tritici isolates and for five years under field conditions with three Z. tritici isolates. Mapping of quantitative trait loci (QTL) resulted in the identification of two major QTL on chromosome 2B designated as Qstb2B_1 and Qstb2B_2. The Qstb2B_1 QTL was mapped at the seedling and the adult plant stage (highest LOD 33.9, explained variance 61.6%), conferring an effective resistance against five Z. tritici isolates. The Qstb2B_2 conferred adult plant resistance (highest LOD 32.9, explained variance 42%) and has been effective at the field trials against two Z. tritici isolates. The physical positions of the flanking markers linked to Qstb2B_1 and Qstb2B_2 indicate that these two QTL are 5 Mb apart. In addition, we identified two minor QTL on chromosomes 1A (Qstb1A) and chromosome 7A (Qstb7A) (highest LODs 4.6 and 4.0, and explained variances of 16% and 9%, respectively) that were specific to three and one Z. tritici isolates, respectively. All identified QTL were derived from the landrace accession Agili39 that represents a valuable source for STB resistance in durum wheat. Conclusion This study demonstrates that Z. tritici resistance in the ‘Agili39’ landrace accession is controlled by two minor and two major QTL acting in an additive mode. We also provide evidence that the broad efficacy of the resistance to STB in ‘Agili 39’ is due to a natural pyramiding of these QTL. A sustainable use of this Z. tritici resistance source and a positive selection of the linked markers to the identified QTL will greatly support effective breeding for Z. tritici resistance in durum wheat.

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“…Two QTL for STB resistance were mapped on chromosome 2B in the 'Agili39'/khiar population. Other studies have also revealed genomic regions on chromosome 2B associated with the STB resistance [8, 66, [70][71][72][73].…”

Section: Identi Cation Of Epistatic Qtlmentioning

confidence: 99%

“…The Qstb2B_1 QTL identi ed in the 'Agili39'/Khiar population likely co-localized with the known major gene Stb9 that was mapped in the French bread wheat cv. Courtot [70]; with the qSTB.2 QTL mapped in the Ethiopian durum wheat landrace population [8]; with the QStb.ihar-2B.2 QTL mapped in the Liwilla/Begra bread wheat doubled-haploid population [72]; and with the QStb.l -2B.1 mapped in the eight-founder MAGIC population of winter wheat [73]. However, the Qstb2B_1 QTL is different from the QTL mapped at the long arm of chromosome 2B in the Nimbus/Stigg bread wheat mapping population [71].…”

Section: Identi Cation Of Epistatic Qtlmentioning

confidence: 99%

Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’

Ferjaoui

Aouini

Slimane

et al. 2021

Preprint

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Background Septoria tritici blotch (STB), caused by Zymoseptoria tritici (Z. tritici), is an important biotic threat to durum wheat in the entire Mediterranean Basin. Although most durum wheat cultivars are susceptible to Z. tritici, research in STB resistance in durum wheat has been limited. Results In our study, we have identified resistance to a wide array of Z. tritici isolates in the Tunisian durum wheat landrace accession ‘Agili39’. Subsequently, a recombinant inbred population was developed and tested under greenhouse conditions at the seedling stage with eight Z. tritici isolates and for five years under field conditions with three Z. tritici isolates. Mapping of quantitative trait loci (QTL) resulted in the identification of two major QTL on chromosome 2B designated as Qstb2B_1 and Qstb2B_2. The Qstb2B_1 QTL was mapped at the seedling and the adult plant stage (highest LOD 33.9, explained variance 61.6 %), conferring an effective resistance against five Z. tritici isolates. The Qstb2B_2 conferred adult plant resistance (highest LOD 32.9, explained variance 42 %) and has been effective at the field trials against two Z. tritici isolates. The Qstb2B_1 QTL was mapped at the seedling and the adult plant stage (highest LOD 33.9, explained variance 61.6 %), conferring an effective resistance against five Z. tritici isolates. The Qstb2B_2 conferred adult plant resistance (highest LOD 32.9, explained variance 42 %) and has been effective at the field trials against two Z. tritici. The physical positions of the flanking markers linked to Qstb2B_1 and Qstb2B_2 indicate that these two QTL are 5Mb apart. In addition, we identified two minor QTL on chromosomes 1A (Qstb1A) and chromosome 7A (Qstb7A) (highest LODs 4.6 and 4.0, and explained variances of 16 % and 9%, respectively) that were specific to three and one Z. tritici isolates, respectively. All identified QTL were derived from the landrace accession Agili39 that represents a valuable source for STB resistance in durum wheat. Conclusion This study demonstrates that Z. tritici resistance in the ‘Agili39’ landrace accession is controlled by two minor and two major QTL acting in an additive mode.

show abstract

Genetic mapping of quantitative trait loci (QTL) for resistance to septoria tritici blotch in a winter wheat cultivar Liwilla

Cited by 9 publications

References 69 publications

Genome-Wide Association Study of Septoria tritici Blotch Resistance in Ethiopian Durum Wheat Landraces

Genome-Wide Association Study of Septoria tritici Blotch Resistance in Ethiopian Durum Wheat Landraces

Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’

Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’

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