Virulence in the Puccinia triticina population in the Czech Republic and resistance genes in registered cultivars 1966–2019

Hanzalová, A.; Dumalasová, V.; Zelba, Ondřej

doi:10.1007/s10681-020-02733-4

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…Lr28 resistance was overcome within 2 years (2014–2015), with a large decrease of its efficacy in France. A similar pattern was observed in the Czech Republic, where Lr28 conferred high levels of resistance (rated 7.0) to cultivars widely deployed in 2013, but displayed a rapid loss of efficacy, with resistance levels falling to 2.7 for these cultivars in 2015 (Hanzalová et al, 2021). Lr genes are generally rapidly overcome in wheat‐growing areas worldwide.…”

Section: Discussionsupporting

confidence: 64%

Is virulence phenotype evolution driven exclusively by Lr gene deployment in French Puccinia triticina populations?

et al. 2022

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Puccinia triticina is a highly damaging wheat pathogen. The efficacy of leaf rust control by genetic resistance is mitigated by the adaptive capacity of the pathogen, expressed as changes in its virulence combinations (pathotypes). An extensive P. triticina population survey has been carried out in France over the last 30 years, describing the evolutionary dynamics of this pathogen in response to cultivar deployment. We analysed the data set for the 2006–2016 period to determine the relationship between the Lr genes in the cultivars and virulence in the pathotypes. Rust populations were dominated by a small number of pathotypes, with variations in most of the virulence frequencies related to the corresponding Lr gene frequencies in the cultivated landscape. Furthermore, the emergence and spread of a new virulence matched the introduction and use of the corresponding Lr gene (Lr28), confirming that the deployment of qualitative resistance genes is an essential driver of evolution in P. triticina populations. However, principal component analysis (PCA) revealed that certain pathotype–cultivar associations cannot be explained solely by the distribution of Lr genes in the landscape. This conclusion is supported by the predominance of a few pathotypes on some cultivars, with the persistence of several other compatible pathotypes at low frequencies. Specific interactions are not, therefore, sufficient to explain the distribution of virulence in rust populations. The hypothesis that quantitative interactions between P. triticina populations and bread wheat cultivars—based on differences in aggressiveness—is also a driver of changes in pathotype frequencies deserves further investigation.

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Section: Discussionsupporting

confidence: 64%

Is virulence phenotype evolution driven exclusively by Lr gene deployment in French Puccinia triticina populations?

et al. 2022

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“…The results verified by canonical correlation analysis and subsequent ANOVA showed that the genotypes carrying Lr9 performed significantly better under greenhouse conditions. This is in agreement with reports declaring efficiency of Lr9 in Europe (Aktar- Uz-Zaman et al, 2017;Volkova et al, 2022) and against Czech isolates used also in this study (Hanzalová et al, 2021). Similarly, if the genotype carried Lr58, it was more likely to be resistant in the field.…”

Section: Discussionsupporting

confidence: 93%

“…tauschii accessions revealed significantly lower resistance at seedling stage in presence of Lr21. Although this is in contrast with work of Naz et al, 2021, one of the causes might be high virulence of Czech isolates against Lr21 with average of 94% between 2002-2019 (Hanzalová et al, 2021).…”

Section: Discussioncontrasting

confidence: 60%

Leaf rust resistance genes in Aegilops genus: occurrence and efficiency

et al. 2023

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Leaf rust is a common and costly wheat disease. The introduction of resistance genes derived from wheat wild relatives is one way to improve disease control. However, due to the rapid development of virulence in the casual pathogen Puccinia triticina, the long-term effectiveness of some leaf rust resistance (Lr) genes is questionable. To assess this, we examined 130 accessions of 13 wheat wild relative species from the Aegilops genus. The presence of 9 Lr genes was determined by PCR using primers complementary to Lr gene markers. The studied individuals were exposed to artificial inoculation with P. triticina under greenhouse and field conditions, respectively. Based on infection rate, the degree of resistance for each individual was estimated. The relationship between the presence of Lr genes and the degree of manifested resistance was assessed using canonical correlation analysis (CCA) and analysis of variance (ANOVA). Our results indicate the effective participation of Lr9 in seedling resistance while Lr58 is involved in adult plant resistance.

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“…Lr28 resistance was overcome within two years (2014-2015), with a large decrease of its efficacy in France. A similar pattern was observed in the Czech Republic, where Lr28 conferred high levels of resistance (rated 7.0) to cultivars widely deployed in 2013, but displayed a rapid loss of efficacy, with resistance levels falling to 2.7 for these cultivars in 2015 (Hanzalová et al 2021). Lr genes are generally rapidly overcome in wheat-growing areas worldwide.…”

Section: Discussionsupporting

confidence: 64%

Is virulence phenotype evolution driven exclusively by Lr gene deployment in French Puccinia triticina populations?

Fontyn

Zippert

Delestre

et al. 2022

Preprint

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Puccinia triticina is a highly damaging wheat pathogen. The efficacy of leaf rust control by genetic resistance is mitigated by the adaptive capacity of the pathogen, expressed as changes in its virulence combinations (pathotypes). An extensive P. triticina population survey has been carried out in France over the last 30 years, describing the evolution dynamics of this pathogen in response to cultivar deployment. We analyzed the dataset for the 2006-2016 period to determine the relationship between the Lr genes in the cultivars and virulence in the pathotypes. Rust populations were dominated by a small number of pathotypes, with variations in most of the virulence frequencies related to the corresponding Lr gene frequencies in the cultivated landscape. Furthermore, the emergence and spread of a new virulence matched the introduction and use of the corresponding Lr gene (Lr28), confirming that the deployment of qualitative resistance genes is an essential driver of evolution in P. triticina populations. However, PCA revealed that certain pathotype-cultivar associations cannot be explained solely by the distribution of Lr genes in the landscape. This conclusion is supported by the predominance of a few pathotypes on some cultivars, with the persistence of several other compatible pathotypes at low frequencies. Specific interactions are not, therefore, sufficient to explain the distribution of virulence in rust populations. Our findings suggest that aggressiveness is a driver of changes in pathotype frequencies. Accordingly, the hypothesis of "dual selection", based on both qualitative and quantitative interactions between P. triticina populations and bread wheat cultivars, is favored.

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Virulence in the Puccinia triticina population in the Czech Republic and resistance genes in registered cultivars 1966–2019

Cited by 5 publications

References 18 publications

Is virulence phenotype evolution driven exclusively by Lr gene deployment in French Puccinia triticina populations?

Is virulence phenotype evolution driven exclusively by Lr gene deployment in French Puccinia triticina populations?

Leaf rust resistance genes in Aegilops genus: occurrence and efficiency

Is virulence phenotype evolution driven exclusively by Lr gene deployment in French Puccinia triticina populations?

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