Tan spot of wheat in Northern Tunisia: distribution, prevalence, incidence and severity

Kamel, Sana; Cherif, Mejda

doi:10.1007/s42976-020-00120-2

Cited by 8 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Northern Africa has been also the cradle of wheat production for centuries and was the breadbasket for the Roman Empire [9,10] with locations such as Dougga in Tunisia, as exquisite trading zones for wheat and other commodities until the late 500's AD [11]. In Tunisia, durum wheat occupies 725 Mha approximates representing 49% of the total annual cereal area [12], with an average yield estimated at 1.7 tons per hectare between the cropping seasons 2014/2015 and 2019/2020 [13].…”

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

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

show abstract

“…Since the 1970s, Tunisian farmers gradually abandoned landraces in favor of elite cultivars. Although, the currently cultivated cultivars are high yielding, they were found to be susceptible to multiple diseases, including tan spot, Septoria tritici blotch, and rusts [ 8 , 9 , 10 , 11 ]. Numerous studies evaluated Mediterranean durum wheat landraces for genetic diversity as well as resistance/tolerance to abiotic and biotic stresses.…”

Section: Introductionmentioning

confidence: 99%

“…This disease has been reported in all major wheat-growing regions, including North and South America, North and South Asia, Europe, and North Africa [ 19 , 20 ]. Tan spot is increasingly gaining importance in the Mediterranean region and has been reported in Algeria, Morocco, and Tunisia [ 11 , 21 , 22 , 23 , 24 , 25 ]. To date, Ptr is known to produce three well characterized Necrotrophic effectors (NEs)—one NE inducing necrosis termed Ptr ToxA and two NEs inducing chlorosis termed Ptr ToxB and Ptr ToxC [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, moderately infected fields in Morocco induced 18% yield losses [ 38 ]. In Tunisia, tan spot disease is an emerging threat to wheat production [ 11 , 14 ]. Although no studies were carried out to assess the extent of yield losses, recent studies about Ptr in Tunisia revealed a high morphological, phenotypic, and genotypic diversity [ 19 , 24 , 25 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

“…Six races, namely, 2, 4, 5, 6, 7, and 8, were identified in addition to atypical isolates that were able to cause necrosis on the differential line ‘Glenlea’ but lacked the expected ToxA gene [ 19 , 24 , 25 ]. The homothallic nature of the pathogen, its virulence and the wide adoption of conservation practices, as well as the wide cultivation of susceptible cultivars, contributed to the high genetic diversity of the pathogen [ 11 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Mediterranean Durum Wheat for Resistance to Pyrenophora tritici-repentis

Laribi

Yahyaoui

Abdedayem

et al. 2022

Genes

View full text Add to dashboard Cite

Tan spot (TS), caused by the fugus Pyrenophora tritici-repentis (Ptr), has gained significant importance in the last few years, thereby representing a threat to wheat production in all major wheat-growing regions, including Tunisia. In this context, we evaluated a Mediterranean collection of 549 durum wheat accessions under field conditions for resistance to Ptr over two cropping seasons in Jendouba (Tunisia), a hot spot for Ptr. The relative disease severities showed significant phenotypic variation from resistance to susceptibility. The correlation between disease scores over the two trials was significant, as 50% of the accessions maintained good levels of resistance (resistant–moderately resistant). Seedling- and adult-stage reactions were significantly correlated. The ANOVA analysis revealed that the genotype term is highly significant at the adult stage, thus emphasizing the high genetic variability of the tested accessions. Reaction-type comparison among and between countries revealed a high diversity of TS resistance. Plant height (PH) was negatively correlated to disease scores, indicating that PH might either have a significant effect on TS severity or that it can be potential disease escape traits. The evaluation of this collection allowed for the identification of potential diverse resistance sources to Ptr that can be incorporated in breeding programs.

show abstract

Tan spot of wheat: can biological control interact with actual management practices to counteract this global disease?

Reynoso

Sautua²,

Carmona³

et al. 2023

Eur J Plant Pathol

View full text Add to dashboard Cite

Tan spot of wheat in Northern Tunisia: distribution, prevalence, incidence and severity

Cited by 8 publications

References 21 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’

Characterization of Mediterranean Durum Wheat for Resistance to Pyrenophora tritici-repentis

Tan spot of wheat: can biological control interact with actual management practices to counteract this global disease?

Contact Info

Product

Resources

About