Poster Session: Biology and Disease Management - Genetics of Resistance
314-P
Mapping of unique and broad spectrum resistance genes to Zymoseptoria tritici in durum wheat..
L. AOUINI (1), M. Maccaferri (2), R. Tuberosa (2), A. Prodi (2), S. Stefanelli (2), S. Hamza (3), G. H. Kema (4)
(1) Plant Research International- Wageningen University, Wageningen , Netherlands; (2) DISTA, Viale Fanin 44, University of Bologna, 40127 Bologna, Italy, Bologna , Italy; (3) National Institute of Agronomy of Tunisia, INAT, 43 Avenue Charles Nicolle, 108
Very little progress was made in the understanding of the genetic basis of resistance in durum wheat to Zymoseptoria Tritici (Z. tritici). In our study, we explored the durum wheat resistance to Z. tritici in three recombinant mapping populations developed in Italy and Tunisia. All seedling experiments were performed under controlled conditions at Wageningen University, while adult test were either performed in Italy for Kofa/Svevo and Simeto/Levante, or in Tunisia for Khiar/Agili 39. In all populations we identified major QTLs conferring either partial or complete resistance to Z. tritici. New locations were identified on chromosome 4B in Kofa/Svevo conferring partial resistance in the adult stage, and on chromosome 6B for partial seedling resistance in Simeto/Levante. Other QTLs reported in bread wheat were also identified in both populations. Interestingly, we also identified a major QTL in Khiar/Agili 39 on chromosome 2B, which was effective in the adult stage in field tests across F6-F9 generations as well as against eight Z. tritici isolates from various origins in the seedling stage. Another unknown major QTL was mapped on chromosome 1A, which provided resistance to three Z. tritici isolates in the seedling stage. Hence, our study showed the existence of novel and wide spectrum resistance alleles to Z. tritici in durum wheat that can be used to mitigate the impact of Z. tritici in this important food crop.