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Life story of Tunisian durum wheat landraces revealed by their genetic and phenotypic diversity

Abstract : Durum wheat (Triticum turgidum L. subsp. durum) landraces represent a prominent genetic resource for Mediterranean farming systems and breeding programs. Fourteen landraces sampled in Tunisia were genotyped with 9 microsatellite markers and characterized with 15 morphological descriptors, including resistance to the fungal disease Septoria tritici blotch (STB). The genetic diversity, nearly was as important within landraces populations (45%) than between populations (54%). It was structured in seven genetic groups and was only partly explained by the variety name or the locality of origin. Populations were also greatly diversified phenotypically (Shannon-Weaver H'=0.54) with traits related to spike and awn colours being the most diversified. Resistance to STB was either qualitative in two populations or with varying degrees of quantitative resistance in the others. A Pst-Fst comparison indicate a local adaptation of the populations. Overall, the genetic structure of Tunisian durum wheat landraces revealed a complex selection trajectory and seed exchanges between farmers.
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Preprints, Working Papers, ...
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https://hal.inrae.fr/hal-03303679
Contributor : Isabelle Nadaud <>
Submitted on : Wednesday, July 28, 2021 - 10:56:42 AM
Last modification on : Friday, September 10, 2021 - 4:00:02 PM

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Safa Ben Krima, Amine Slim, Sandrine Gélisse, Hajer Kouki, Isabelle Nadaud, et al.. Life story of Tunisian durum wheat landraces revealed by their genetic and phenotypic diversity. 2021. ⟨hal-03303679⟩

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