Host-Pathogen Relationships of Wheat andSeptoria tritici

Durum wheat and septoria tritici blotch: genes and prospects for breeding

“…In addition we also determined QTLs that are specific for either the seeding or adult plant stage as well as a QTL that was expressed at both stages, similar to other cereal diseases , namely to rust (Hou et al 2015;Lin et al 2014). Overall, our data contrast the observations and conclusions of Van Ginkel and Scharen (1988) who concluded that resistance to Z. tritici in durum wheat is explained by additive gene action and general combining ability, thus denying specificity. Since the cloning of the first Stb gene and the corresponding avirulence effector, the controversy -see also (Johnson 1992) with who hypothesized that the tested 'Agili' accessions most likely carry different Stb genes.…”

“…Although denied in some studies (Johnson 1992;Parlevliet 1993;Van Ginkel and Scharen 1988), cultivar specificity has been widely reported in bread wheat (Ahmed et al 1995;Kema et al 1996c;, as well as in durum wheat Kema et al 1996c;Medini and Hamza 2008), suggesting a gene-for-gene (GFG) interaction between wheat and Z. tritici isolates. This model was supported by the single gene inheritance Figure 2.…”

“…Shafir). The (a)virulence gene was subsequently mapped on the distal part of chromosome 5, and cosegregates with the genomic region responsible for the host specificity, widely reported in a range of studies (Eyal et al 1973;Mirzadi Gohari et al 2015;Van Ginkel and Scharen 1988;Ware 2006). Albeit early reported, host specificity and cultivar specificity in the Z. tritici pathosystem remain inscrutable as so far only genes controlling cultivar specificity have been identified (this thesis; (Zhong et al 2017)).…”

“…General discussion Durum wheat and septoria tritici blotch gene (GFG) model, it remained controversial, particularly due to different epidemiological perceptions (Van Ginkel and Scharen 1988). Recently, however, the first resistance gene and its cognate effector have been cloned thereby functionally proving that GFG underlies the interaction between Z. tritici and wheat (Saintenac et al 2017;Zhong et al 2017).…”

The inheritance of resistance to head blight caused by Fusarium culmorum in winter wheat

“…If so, when calculating R it was wrong to assume that the difference in head blight resistance of the two parents was identical to the difference between the two extreme genotypes possible with the genes involved : as a result, the number of segregating genes was underestimated . Van Ginkel & Scharen (1988) postulated that the assumption of unidirectional gene distribution would be more closely adhered to if the extreme genotypes were selected from the F 2 and used to estimate R . However, in this study the large environmental variances and the continuous distributions of the progenies made it impossible to assign an F2 plant with extreme resistance to a distinct class .…”