Variation in aggressiveness of Plasmopara halstedii (sunflower downy mildew)

Sakr, Nachaat

doi:10.1007/bf03356317

Cited by 21 publications

(47 citation statements)

References 11 publications

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“…Sporulation density was defined as the number of zoosporangia of the pathogen produced on a cotyledon. Reduction of hypocotyl length (dwarfing) corresponded to the distance from the stem base to cotyledon insertion and was measured after 13 days of infection on diseased plants showing sporulation of the pathogen on the shoot (Sakr, 2009;2010). All the pathogenic tests were carried out in growth chambers regulated at 18hrs of light, 18 °C ± 1 and RH of 65−90%.…”

Section: Methodsmentioning

confidence: 99%

“…Virulence has been defined as specific, diseasecausing abilities and aggressiveness as non-specific, diseasecausing abilities (Van der Plank, 1968). Sakr (2009) found differences between two groups of 100, 300, 304 and 314 races and 710, 704 and 714 races by using two criteria of aggressiveness: latent period and sporulation density. Moreover, Sakr (2010) noted that percentage infection and dwarfing could be used to differentiate aggressiveness in P. halstedii, but these criteria played a limited role in defining P. halstedii isolates according to their aggressiveness.…”

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confidence: 96%

“…Concerning this pathosystem, several studies have been carried on virulence (Delmotte et al, 2008;Gulya, 2007;Spring et al, 2006;Tourvieille de Labrouhe et al, 2000, 2010 and more recently on aggressiveness (Sakr, 2009;2010). Virulence has been defined as specific, diseasecausing abilities and aggressiveness as non-specific, diseasecausing abilities (Van der Plank, 1968).…”

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confidence: 99%

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Aggressiveness in Plasmopara halstedii (sunflower downy mildew)

Sakr¹

2011

The Plant Pathology Journal

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Aggressiveness was studied in seven Plasmopara halstedii (sunflower downy mildew) pathotypes: 100, 300, 304, 314, 704, 710 and 714. Aggressiveness criteria including percentage infection, latent period, sporulation density and reduction of hypocotyl length (dwarfing) were analysed in one sunflower inbred line showing a high level of quantitative resistance. Genetic relationships were detected between the seven pathotypes using 12 ESTderived markers. Pathotypes 100, 300, 304 and 314 were characterized with shorter latent period and higher sporulation density than pathotypes 710, 704 and 714. All pathotypes showed high percentage infection values and caused a large reduction in seedling size except for pathotype 314 involved in dwarfing. Pathotypes 714, 704 and 314 had an intermediary genetic position between the pathotypes 100 and 710. No correlation was detected between aggressiveness traits and EST genotypes.

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Section: Methodsmentioning

confidence: 99%

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confidence: 96%

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confidence: 99%

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Aggressiveness in Plasmopara halstedii (sunflower downy mildew)

Sakr¹

2011

The Plant Pathology Journal

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“…New hybrid cultivars evoke selection pressure which results in the emergence of new physiological races (e.g. in France, Germany, and Italy) with different virulence patterns (Sakr 2009;Virányi & Spring 2011). Phytosanitary practices are undertaken to prevent or at least reduce their spread to other countries.…”

Section: Discussionmentioning

confidence: 99%

“…Distribution of sunflower downy mildew and its race spectrum in the local pathogen populations have been intensively studied in several countries in Europe, such as Bulgaria (Shindrova 2010), Spain (Molinero-Ruiz et al 2002), France (Sakr 2009), Germany (Rozynek & Spring 2000), Hungary (Virányi & Gulya 1995), and Italy (Tosi & Beccari 2007). However, no detailed information has been available for the Czech Republic.…”

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Distribution and harmfulness of Plasmopara halstedii on sunflower in the Czech Republic

Sedlářová¹,

Trojanová²,

Lebeda³

2013

Plant Prot. Sci.

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Sedlářová M., Trojanová Z., Lebeda A. (2013): Distribution and harmfulness of Plasmopara halstedii on sunflower in the Czech Republic. Plant Protect. Sci., 49: 1-10.In 2007-2012 the first detailed study of P. halstedii distribution and severity was performed in the Czech Republic by monitoring altogether 128 localities. Incidence of the pathogen was recorded at seven localities in south-eastern (Central and South Moravia) and central parts (East and Central Bohemia) of the country; at only four localities the occurrence of sunflower downy mildew symptoms and pathogen sporulation were recorded repeatedly. In all cases the primary infection prevailed, and the severity of infections was rather low. The majority of records were for sunflower experimental fields (e.g. fields of Central Institute for Supervising and Testing in Agriculture. Brno-Chrlice, Czech Republic), one record came from a commercial field and one record from a hobby field. Results of surveys indicate that reservoirs of primary inoculum likely exist in the soil contaminated by P. halstedii oospores in these habitats, but additional transfer by infected seed may be possible. Historical and geographical consequences of recorded infections are discussed, as well as virulence variation in the Czech pathogen populations which is currently in the process of investigation.

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Can percentage infection and dwarfing be used to differentiate aggressiveness inPlasmopara halstedii?

Sakr

2011

Archives Of Phytopathology And Plant Protection

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Variation in aggressiveness of Plasmopara halstedii (sunflower downy mildew)

Cited by 21 publications

References 11 publications

Aggressiveness in Plasmopara halstedii (sunflower downy mildew)

Aggressiveness in Plasmopara halstedii (sunflower downy mildew)

Distribution and harmfulness of Plasmopara halstedii on sunflower in the Czech Republic

Can percentage infection and dwarfing be used to differentiate aggressiveness inPlasmopara halstedii?

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