Abstract
Parastagonospora nodorum leaf and glume blotch (syn. Septoria nodorum blotch, SNB) is a severe disease in many wheat-growing areas worldwide. In a previous study, a mapping population, Liwilla × Begra, was used to detect several resistance quantitative trait loci (QTL) at the seedling stage. In this study the same mapping population was analysed at the adult plant stage under field and polytunnel conditions. After artificial inoculation the disease severity on leaves and glumes was scored as the areas under the disease progress curves for field tests and as the percentage of the leaf and glume area covered by necrosis for the polytunnel test. Three QTL associated with Septoria nodorum glume blotch resistance and two QTL associated with Septoria nodorum leaf blotch resistance were detected on chromosomes 1B, 3A, 4A and 7D. Each of the detected QTL explained only a small proportion of the total phenotypic variation, ranging from 9.1 to 20.0%. None of these QTL co-located with necrotrophic effector sensitivity loci or aligned with previously identified resistance loci at the seedling stage for the Liwilla × Begra population. SNB resistance QTL detected in our study did not overlap with QTL associated with morphological and developmental traits. Therefore they could be involved in the defence reaction and can be considered in wheat improvement for SNB resistance.
Highlights
In the year 2002 only, the resistant parent Liwilla was observed among DH lines in the class with extremely low areas under the disease progress curves (AUDPC) for leaves (Table 2)
It was interesting to investigate the reaction of the DH population Liwilla × Begra at the adult plant stage
Five quantitative trait loci (QTL) associated with resistance to Septoria nodorum blotch (SNB) were identified, indicating polygenic inheritance, which is in agreement with several previous studies on adult plant resistance in wheat (Schnurbusch et al 2003; Aguilar et al 2005; Uphaus et al 2007; Shankar et al 2008; Francki et al 2011; Lu and Lillemo 2014; Ruud et al 2017; Francki et al 2018)
Summary
Ana Stagonospora, teleomorph Phaeosphaeria) nodorum (Berk.) Quaedvlieg, Verkley and Crous is the causal agent of Septoria nodorum blotch (SNB), an important disease of wheat worldwide (Solomon et al 2006; Quaedvlieg et al 2013). This necrotrophic fungus is able to infect both glumes and leaves, reducing grain yield and quality. Disease severity may be affected by plant height and maturity because the flag leaves and glumes, important in grain filling, are infected with pycnidiospores earlier on short and early maturing plants than on tall and later maturing plants (Eyal 1981; Scott et al 1982). The most effective, ecological and economical method of controlling SNB is the use of host resistance (Francki 2013)
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