Resistance of wheat to septoria tritici blotch (<i>Mycosphaerella graminicola</i>) and associations with plant ideotype and the 1BL−1RS translocation

Arraiano, L. S.; Brading, P. A.; Dedryver, Françoise; Brown, J. K. M.

doi:10.1111/j.1365-3059.2005.01319.x

Cited by 17 publications

(14 citation statements)

References 39 publications

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“…Here, however, the effect of heading date on STB levels was minor and inconsistent between trials, despite a wide range of variation between lines in mean heading date (28–47 days from 1 May, Tables 2 and 5). This supports the work of some authors (Arama et al , 1999; Simón et al , 2005) but not others (Chartrain et al , 2004;Arraiano et al , 2006; Zhang et al , 2007) and thus creates further uncertainty about the contribution of later heading to disease escape.…”

Section: Discussionsupporting

confidence: 85%

“…The data presented here have implications for methods of selecting for reduced STB in wheat cultivars. It has been known for some time that tall, late‐flowering wheat cultivars tend to have lower levels of STB (Eyal, 1981; van Beuningen & Kohli, 1990; Camacho‐Casas et al , 1995; Chartrain et al , 2004;Arraiano et al , 2006). The information presented here shows that this holds in UK conditions, but, within the range of modern wheat cultivars, taller, later‐flowering plants have only a slight advantage in terms of reduced STB, so selecting for these traits solely as a means of escaping the disease will probably have little benefit.…”

Section: Discussionmentioning

confidence: 99%

“…The data also imply that, when conducting genetic analysis on STB severity in adult plants, escape traits need to be separated, as far as possible, from disease resistance (Arraiano et al , 2006). This would enable one to determine whether quantitative trait loci (QTL) associated with reduced STB severity did so by increasing resistance or escape.…”

Section: Discussionmentioning

confidence: 99%

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Contributions of disease resistance and escape to the control of septoria tritici blotch of wheat

Arraiano

Balaam²,

Fenwick³

et al. 2009

Plant Pathology

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The contributions of disease escape and disease resistance to the responses of wheat to septoria tritici leaf blotch (STB) were analysed in a set of 226 lines, including modern cultivars, breeding lines and their progenitors dating back to the origin of scientific wheat breeding. Field trials were located in the important wheat-growing region of eastern England and were subject to natural infection by Mycosphaerella graminicola. STB scores were related to disease-escape traits, notably height, leaf spacing, leaf morphology and heading date, and to the presence of known Stb resistance genes and isolate-specific resistances. The Stb6 resistance gene was associated with a reduction of 19% in the level of STB in the complete set of 226 lines and with a 33% reduction in a subset of 139 lines of semidwarf stature. Greater plant height was strongly associated with reduced STB in the full set of lines, but only weakly in the semidwarf lines. Shorter leaf length was also associated with reduced STB, but, in contrast to earlier reports, lines with more prostrate leaves had more STB on average, probably because they tended to have longer leaves. Several lines, notably cvs Pastiche and Exsept, had low mean levels of STB which could not be explained by either escape traits or specific resistance genes, implying that they have unknown genes for partial resistance to STB.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Contributions of disease resistance and escape to the control of septoria tritici blotch of wheat

Arraiano

Balaam²,

Fenwick³

et al. 2009

Plant Pathology

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“…However, there may be different mechanisms in various cultivars that can result in reduced SLB severity. In relation to disease escape, various studies (CamachoCasas et al 1995;Arraiano et al 2006) have reported severe SLB in some earlier-heading and shorter cultivars, indicating a link between disease severity, height and precocity. No genetic association appears to be implicated in this link; rather, associations could be due to epidemiological or environmental factors.…”

Section: Discussionmentioning

confidence: 96%

Influence of fungicide treatments on disease severity caused by Zymoseptoria tritici, and on grain yield and quality parameters of bread-making wheat under Mediterranean conditions

et al. 2014

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Zymoseptoria tritici is a major fungal pathogen which can cause serious loss in bread-making wheat. In this study, field experiments were conducted over two growing seasons to evaluate the effect of fungicide treatment (1-or 2-sprays of prothioconazole and tebuconazole) on Septoria leaf blotch (SLB) severity, wheat grain yield, hectolitre weight, crude protein and on the SDS (sodium dodecyl sulphate) sedimentation test. The influence of cultivar resistance on fungicide efficacy under Mediterranean conditions was also analysed. The results showed that in years drier than average, fungicide application might not be recommended as SLB severity would be low and the fungicide application itself could reduce grain yield. At highseverity of SLB, one spray of prothioconazole + tebuconazole applied between anthesis and maturation reduced disease severity by more than 50 % and increased grain yield by approximately 20 %. Fungicide treatment did not affect the quality parameters of the grain, measured as crude protein and by the SDS sedimentation test, under these experiment conditions.

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“…Z. tritici populations rapidly overcame resistance in wheat cultivars and repeatedly evolved resistance to multiple fungicide classes (27, 28). Despite the identification of both isolate-specific resistance and quantitative virulence (29), the genetic basis of the interaction between wheat and Z. tritici remains poorly understood (30). …”

Section: Introductionmentioning

confidence: 99%

The Evolution of Orphan Regions in Genomes of a Fungal Pathogen of Wheat

Plissonneau

Sturchler

Croll

2016

mBio

122

133

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Fungal plant pathogens rapidly evolve virulence on resistant hosts through mutations in genes encoding proteins that modulate the host immune responses. The mutational spectrum likely includes chromosomal rearrangements responsible for gains or losses of entire genes. However, the mechanisms creating adaptive structural variation in fungal pathogen populations are poorly understood. We used complete genome assemblies to quantify structural variants segregating in the highly polymorphic fungal wheat pathogen Zymoseptoria tritici. The genetic basis of virulence in Z. tritici is complex, and populations harbor significant genetic variation for virulence; hence, we aimed to identify whether structural variation led to functional differences. We combined single-molecule real-time sequencing, genetic maps, and transcriptomics data to generate a fully assembled and annotated genome of the highly virulent field isolate 3D7. Comparative genomics analyses against the complete reference genome IPO323 identified large chromosomal inversions and the complete gain or loss of transposable-element clusters, explaining the extensive chromosomal-length polymorphisms found in this species. Both the 3D7 and IPO323 genomes harbored long tracts of sequences exclusive to one of the two genomes. These orphan regions contained 296 genes unique to the 3D7 genome and not previously known for this species. These orphan genes tended to be organized in clusters and showed evidence of mutational decay. Moreover, the orphan genes were enriched in genes encoding putative effectors and included a gene that is one of the most upregulated putative effector genes during wheat infection. Our study showed that this pathogen species harbored extensive chromosomal structure polymorphism that may drive the evolution of virulence.

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Resistance of wheat to septoria tritici blotch (Mycosphaerella graminicola) and associations with plant ideotype and the 1BL−1RS translocation

Cited by 17 publications

References 39 publications

Contributions of disease resistance and escape to the control of septoria tritici blotch of wheat

Contributions of disease resistance and escape to the control of septoria tritici blotch of wheat

Influence of fungicide treatments on disease severity caused by Zymoseptoria tritici, and on grain yield and quality parameters of bread-making wheat under Mediterranean conditions

The Evolution of Orphan Regions in Genomes of a Fungal Pathogen of Wheat

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