Unlocking the story of resistance to Zymoseptoria tritici in Tunisian old durum wheat germplasm based on population structure analysis.

Autor: Ouaja M; Department of agronomy and plant biotechnology, Laboratory of genetics and cereal breeding (LR14AGR01), The National Agronomic Institute of Tunisia (INAT), University of Carthage, 43 Avenue Charles-Nicolle, Tunis, 1082, Tunisia., Bahri BA; Department of agronomy and plant biotechnology, Laboratory of genetics and cereal breeding (LR14AGR01), The National Agronomic Institute of Tunisia (INAT), University of Carthage, 43 Avenue Charles-Nicolle, Tunis, 1082, Tunisia.; Department of Plant Pathology, Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Griffin, GA, 30223, USA., Ferjaoui S; Field Crops Laboratory, Regional Field Crops Research Center of Beja (CRRGC), P.O. Box 350, Beja, 9000, Tunisia., Medini M; Banque Nationale des Gènes (BNG), Boulevard du Leader Yasser Arafat Z. I Charguia 1, Tunis, 1080, Tunisie., Sripada UM; International Center for Agricultural Research in the Dry Areas (ICARDA), Avenue Hafiane Cherkaoui, Rabat, Marocco., Hamza S; Department of agronomy and plant biotechnology, Laboratory of genetics and cereal breeding (LR14AGR01), The National Agronomic Institute of Tunisia (INAT), University of Carthage, 43 Avenue Charles-Nicolle, Tunis, 1082, Tunisia. hamza.sonia@inat.agrinet.tn.
Jazyk: angličtina
Zdroj: BMC genomics [BMC Genomics] 2023 Jun 15; Vol. 24 (1), pp. 328. Date of Electronic Publication: 2023 Jun 15.
DOI: 10.1186/s12864-023-09395-1
Abstrakt: Background: Septoria tritici blotch (STB) remains a significant obstacle to durum wheat cultivation on a global scale. This disease remains a challenge for farmers, researchers, and breeders, who are collectively dedicated to reduce its damage and improve wheat resistance. Tunisian durum wheat landraces have been recognized as valuable genetic ressources that exhibit resistance to biotic and abiotic stresses and therefore play a crucial role in breeding program aimed at creating new wheat varieties resistant to fungal diseases as STB, as well as adapted to climate change constraints.
Results: A total of 366 local durum wheat accessions were assessed for resistance to two virulent Tunisian isolates of Zymoseptoria tritici Tun06 and TM220 under field conditions. Population structure analysis of the durum wheat accessions, performed with 286 polymorphic SNPs (PIC > 0.3) covering the entire genome, identified three genetic subpopulations (GS1, GS2 and GS3) with 22% of admixed genotypes. Interestingly, all of the resistant genotypes were among GS2 or admixed with GS2.
Conclusions: This study revealed the population structure and the genetic distribution of the resistance to Z. tritici in the Tunisian durum wheat landraces. Accessions grouping pattern reflected the geographical origins of the landraces. We suggested that GS2 accessions were mostly derived from eastern Mediterranean populations, unlike GS1 and GS3 that originated from the west. Resistant GS2 accessions belonged to landraces Taganrog, Sbei glabre, Richi, Mekki, Badri, Jneh Khotifa and Azizi. Furthermore, we suggested that admixture contributed to transmit STB resistance from GS2 resistant landraces to initially susceptible landraces such as Mahmoudi (GS1), but also resulted in the loss of resistance in the case of GS2 susceptible Azizi and Jneh Khotifa accessions.
(© 2023. The Author(s).)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje