Durum Wheat Mediterranean Landraces: A Valuable Source for Resistance to Tan Spot Disease

Marwa Laribi, Sarrah Ben M’Barek, Moez Fakhfakh, Amor Hassine Yahyaoui and Khaled Sassi
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Marwa Laribi: LR14AGR01 Laboratory of Genetic and Cereal Breeding, National Agronomic Institute of Tunisia, University of Carthage, Tunis 1082, Tunisia
Sarrah Ben M’Barek: CRP Wheat Septoria Precision Phenotyping Platform, Tunis 1082, Tunisia
Moez Fakhfakh: Comptoir Multiservices Agricoles, 82, Avenue Louis Brailles, Tunis Belvédère, Tunis 1002, Tunisia
Amor Hassine Yahyaoui: CRP Wheat Septoria Precision Phenotyping Platform, Tunis 1082, Tunisia
Khaled Sassi: LR14AGR01 Laboratory of Genetic and Cereal Breeding, National Agronomic Institute of Tunisia, University of Carthage, Tunis 1082, Tunisia

Agriculture, 2021, vol. 11, issue 11, 1-17

Abstract: Tan spot (TS), caused by Pyrenophora tritici-repentis ( Ptr ), has gained significant importance in Tunisia. In this study, a Mediterranean durum wheat collection of 113 accessions were evaluated under field conditions, during the 2018–2019 cropping season, for resistance to Ptr at Koudia experimental station in Bou Salem (Tunisia). The disease progress curve (AUDPC) was used to screen this collection, and the effect of days to heading (DH) and plant height (PH) were evaluated in relation to TS resistance. No significant correlation of PH with AUDPC was found, yet a significant correlation ( r = 0.212, p ≤ 0.05) was established between DH and AUDPC scores, suggesting that DH may have an effect on TS development. Moreover, correlation between seedling and adult reactions was significant ( r = 0.695, p ≤ 0.001). Although susceptible accessions clustered separately from resistant accessions, the clustering was independent of the country of origin and the status of improvement of the wheat accessions. In total, 67% and 80% of resistant and moderately resistant accessions, respectively, were landraces, suggesting therefore the possible presence of novel sources of resistance to Ptr in some landraces, which can be used to establish a breeding program for resistance to tan spot disease.

Keywords: tan spot; durum wheat; landrace; diversity; plant height; days to heading; resistance (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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