Genome wide association mapping for resistance to multiple fungal pathogens in a panel issued from a broad composite cross-population of tetraploid wheat Triticum turgidum

Ballini, Elsa; Tavaud, Muriel; Ducasse, Aurélie; Sanchez, Daniel J.; Paux, Etienne; Kitt, Jonathan; Charmet, G.; Audigeos, Delphine; Roumet, Pierre; David, Jacques; Morel, Jean-Benoît

doi:10.1007/s10681-020-02631-9

Cited by 12 publications

(10 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zymoseptoria tritici is a major threat to European and Mediterranean bread and durum wheat production [ 44 ]. Despite the increasing efforts to elucidate the genetic basis of tetraploid wheat resistance to STB [ 8 , 40 , 45 ], more studies are required for an effective breeding strategy in durum wheat for STB resistance.…”

Section: Discussionmentioning

confidence: 99%

“…Thus far, the substantial research progress is mainly based on the Z. tritici – bread wheat pathosystem [ 34 , 39 ]. Therefore, and albeit the growing efforts to dissect the durum wheat – Z. tritici interactions [ 12 , 33 , 40 , 41 ], resistance breeding to Z. tritici in durum wheat has slowly progressed over the last 25 years compared to bread wheat [ 34 ]. This affects many small growers who produce this wheat as a staple crop in an area that is severely struck by septoria tritici blotch.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Zymoseptoria tritici is a major threat to European and Mediterranean bread and durum wheat production [45]. Despite the increasing efforts to elucidate the genetic basis of tetraploid wheat resistance to STB [8, 40,46], more studies are required for an effective breeding strategy in durum wheat for STB resistance. The complexity of mapping resistance genes in durum wheat is twofold; (i) the majority of durum wheat varieties is highly susceptible to Z. tritici…”

Section: Discussionmentioning

confidence: 99%

“…Thus far, the substantial research progress is mainly based on the Z. tritici -bread wheat pathosystem [34,39]. Therefore, and albeit the growing efforts to dissect the durum wheat -Z. tritici interactions [12,33,40,41], resistance breeding to Z. tritici in durum wheat has slowly progressed over the last 25 years compared to bread wheat [34]. This affects many small growers who produce this wheat as a staple crop in an area that is severely struck by septoria tritici blotch.…”

Section: Introductionmentioning

confidence: 99%

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

Ferjaoui

Aouini

Slimane

et al. 2021

Preprint

View full text Add to dashboard Cite

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

“…To prepare the inoculum, a heat shock of 40 °C for 10 min was applied to the spores and they then were suspended in 1 ml of Tween 20 before diluting in 30 ml of water (with 0.1% gelatin). We used an average of 8 mg of spores to inoculate 144 plants by spraying (Ballini et al, 2020).…”

Section: Pathogen Material Inoculation Procedure and Disease Assessmentmentioning

confidence: 99%

Plant neighbour-modulated susceptibility to pathogens in intraspecific mixtures

Pélissier

Buendia

Brousse

et al. 2021

Journal of Experimental Botany

Self Cite

View full text Add to dashboard Cite

As part of a trend towards diversifying cultivated areas, varietal mixtures are regaining attention to manage diseases. Besides the epidemiological effects of varietal mixtures on pathogen propagation, little is known about the effect of intra-specific plant-plant interactions and their impact on plant response to disease. Genotypes of rice or durum wheat were grown with different conspecific neighbours and manually inoculated under conditions preventing pathogen propagation. We measured their disease susceptibility and the expression of basal immunity genes as part of the response to intra-specific neighbours. The results show for both rice and wheat that susceptibility to pathogens and immunity is modified in many instances by the presence of intra-specific neighbours. . This phenomenon, that we termed ‘Neighbour-Modulated Susceptibility’ (NMS), could be caused by the production of belowground signals and does not require the neighbours to be infected. Our study calls for a revisiting of the mechanisms reducing disease in varietal mixtures in the field.

show abstract

Genome wide association mapping for resistance to multiple fungal pathogens in a panel issued from a broad composite cross-population of tetraploid wheat Triticum turgidum

Cited by 12 publications

References 84 publications

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’

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

Plant neighbour-modulated susceptibility to pathogens in intraspecific mixtures

Contact Info

Product

Resources

About