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Universität für Bodenkultur Wien (2009)

Molecular genetic analysis of resistance to Fusarium head blight in back-cross derived population of Triticum dicoccoides with Triticum durum

Alimari, Abdallah

Titre : Molecular genetic analysis of resistance to Fusarium head blight in back-cross derived population of Triticum dicoccoides with Triticum durum

Molekular-genetische Analyse der Ährenfusarioseresistenz in einer Triticum dicoccoides mit Triticum durum Rückkreuzungspopulation

Auteur : Alimari, Abdallah

Université de soutenance : Universität für Bodenkultur Wien

Grade : Doktorate 2009

Résumé
Fusarium head blight (FHB), caused by Fusarium graminearum is a serious disease problem on durum wheat (T. durum). Durum wheat is generally considered highly susceptible to FHB. Attempts to transfer resistance from hexaploid wheat to durum wheat have met with limited success. However, one potential source of resistance for durum wheat is the tetraploid wild emmer wheat (T. dicoccoides). A population of 105 BC1F6 lines from a backcross of T. dicoccoides (line ‘Mt. Gerizim#36, resistant) with T. durum (cultivar ‘Helidur, susceptible) has been evaluated for FHB resistance in five experiments. A continuous variation was observed among genotypes studied with respect to all FHB-related traits and the variation was significant (0.05) for all FHB-related traits. The heritability results ranged from 0.63 to 0.89. The population was genotyped with 522 DNA markers (142 SSR loci and 380 AFLP polymorphic fragments). The major QTL effects associated with resistance to fungal spread (type II resistance) mapped to chromosomes 3A and 6B. Two separate QTL were detected on chromosome 3A. The first QTL on chromosome 3A mapped to the flanking markers Xgwm1121-Xgwm720 and the second QTL on chromosome 3A mapped to the flanking markers Xgwm2-Xgwm779. The most likely positions of these two QTL appeared at a distance of 39.6 cM. One QTL was detected on chromosome 6B. The position for the 6B QTL was between the flanking markers XS23M17_5-Xgwm626. The two QTL on chromosome 3A explained 1521% of the phenotypic variation for resistance to fungal spread and the QTL on chromosome 6B explained 1723% of phenotypic variation. The obtained results, especially the described markers linked to resistance QTL, can be applied in durum wheat improvement

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