DNA markers identify variation in Australian populations of Uncinula necator

Evans, K. J.; Whisson, D.L.; Stummer, Belinda E.; Scott, Eileen S.

doi:10.1017/s0953756297003596

Cited by 29 publications

(23 citation statements)

References 20 publications

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“…Two genetic groups also have been observed in Australia but without reference to flag shoots (Evans et al, 1997;Stummer et al, 2000). These groups were shown to correspond to those identified in Europe (De´lye et al, 1999;Stummer et al, 2000).…”

Section: Introductionsupporting

confidence: 56%

“…Genetically distinct but morphologically similar groups have been identified in populations of E. necator Evans et al, 1997;De´lye and Corio-Costet, 1998;Stummer et al, 2000;Miazzi et al, 2003). De´lye et al (1997) distinguished a group of isolates in Europe corresponding to flag shoots, and another group comprising foliar isolates collected later in the growing season.…”

Section: Introductionmentioning

confidence: 92%

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Genetic Variation and Population Structure of the Grape Powdery Mildew Fungus, Erysiphe necator, in Southern France

et al. 2005

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Erysiphe necator, the causative agent of powdery mildew in grapevine, was introduced into Europe from North America during the middle of the 19th century. Our objective was to analyze the genetic variation and the population structure of the fungus in southern France. The sample comprised 101 isolates and was mainly of flag shoot origin, i.e., infection of sprouting shoots after overwintering of mycelium in buds. RAPD analysis identified different haplotypes that clustered in two genetic groups (A and B). The most frequent haplotypes of each group were found in several different locations in two areas separated by 100 km and throughout the 3 year period. Several haplotypes of both groups originated from flag shoots and were recovered over successive years indicating that there is no correlation between genetic group and overwintering mode. All isolates of group A were of mating type +, but those in group B could be either + or ). Lower genotypic diversity was detected within group A than within group B. These results were consistent with the hypothesis that group A reproduces only asexually.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 92%

Genetic Variation and Population Structure of the Grape Powdery Mildew Fungus, Erysiphe necator, in Southern France

et al. 2005

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“…Uncinula necator), provides a good model system for investigating the effects of the genetic structures of plant pathogens on plant disease epidemics. E. necator populations are structured into two genetically differentiated groups (A and B) that have been identified previously in a number of grapevine-growing countries, including France (11), Australia (14), Italy (26), and Spain (29). Délye et al (11) suggested that group A isolates survive the winter as a resting mycelium within dormant buds, from which growth is reinitiated after budbreak, leading to the colonization of young flag shoots (30,34); in contrast, group B isolates originate from ascospores released from overwintering cleistothecia (19).…”

mentioning

confidence: 87%

Genetic Structure and Aggressiveness of Erysiphe necator Populations during Grapevine Powdery Mildew Epidemics

Montarry

Cartolaro

Delmotte

et al. 2008

Appl Environ Microbiol

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Isolates of the causal ascomycete of grapevine powdery mildew, Erysiphe necator, correspond to two genetically differentiated groups (A and B) that coexist on the same host. This coexistence was analyzed by investigating temporal changes in the genetic and phenotypic structures of E. necator populations during three epidemics. Group A was present only at the start of the growing season, whereas group B was present throughout all three epidemics. Group A was less aggressive in terms of germination and infection efficiency but was more aggressive than group B in terms of the latency period, lesion diameter, and spore production. Our results are consistent with a temporal differentiation of niches, preventing recombination, and suggest an association between the disease level and the frequencies of genetic groups.

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“…Uncinula necator), is one example of a plant pathogen showing two genetically differentiated groups of isolates coexisting on the same host, Vitis vinifera (Délye et al 1997;Evans et al 1997;Miazzi et al 2003;Nuñez et al 2006). Several studies have suggested that genetic E. necator groups (A and B) correlated with ecological features of the pathogen; Délye et al (1997) proposed that group A isolates over-winter as resting mycelium within dormant buds that reinitiate growth after budbreak and colonise young flag-shoots (Pearson and Gärtel 1985), while group B isolates would survive as ascospores released from overwintering cleistothecia (Gadoury and Pearson 1988).…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal distribution of Erysiphe necator genetic groups and their relationship with disease levels in vineyards

et al. 2008

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The discovery of genetically distinct Erysiphe necator groups (A or B), with high phenotypic similarities, raises important questions about their coexistence. For plant pathogens, niche partitioning, allowing the coexistence on the same host (i.e. the same resource), might result from separation in space and/or time. We used a landscape genetic approach to study the geographic distribution of genetic groups of E. necator (distinguished by a SNP in the β-tubulin gene) at the spatial scale of the Languedoc-Roussillon region (southern France) and to assess the temporal succession of groups along the course of the 2007 epidemic. Spatial distribution revealed a high heterogeneity between vineyards: from 100% B to 100% A, with 62% and 38% of vineyards showing a majority of A and B isolates, respectively. Temporal isolation seems to be the major mechanism in the coexistence of the two genetic groups: all isolates collected towards the end of the epidemic belonged to group B, whatever the initial frequency of genetic groups. Our results confirm that both A or B isolates can lead to flag-shoot symptoms, and showed that group A isolates tend to disappear during the course of the epidemic, whereas group B isolates may be active during the entire epidemic and involved in further production of cleistothecia, when recombination takes place. For the first time, the relationship between the frequency of genetic groups and disease levels on leaves and clusters at the end of the epidemic was evaluated. We showed a strong relationship between the disease severity and the genetic composition of E. necator populations: the damage was more important when the epidemic was initiated by B isolates.

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DNA markers identify variation in Australian populations of Uncinula necator

Cited by 29 publications

References 20 publications

Genetic Variation and Population Structure of the Grape Powdery Mildew Fungus, Erysiphe necator, in Southern France

Genetic Variation and Population Structure of the Grape Powdery Mildew Fungus, Erysiphe necator, in Southern France

Genetic Structure and Aggressiveness of Erysiphe necator Populations during Grapevine Powdery Mildew Epidemics

Spatio-temporal distribution of Erysiphe necator genetic groups and their relationship with disease levels in vineyards

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