Virulence spectrum in populations of the barley powdery mildew pathogen, Erysiphe graminis f. sp. hordei in Tunisia and Morocco in 1992

Yahyaoui, A.; Reinhold, M.; Scharen, A. L.

doi:10.1046/j.1365-3059.1997.d01-11.x

Cited by 19 publications

(10 citation statements)

References 8 publications

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“…Among specific resistance alleles the most common (seventeen lines) postulated or possible allele was Mlat. This is in agreement with the fact that virulence to Mlat is very common in Moroccan mildew population and that Mlat resistance gene was originally described from western North Africa (Caddel, 1976;Jargensen, 1994;Yahyaoui et al, 1997).…”

Section: Discussionsupporting

confidence: 88%

Sources of powdery mildew resistance in barley landraces from morocco

Czembor¹

2000

Archives Of Phytopathology And Plant Protection

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A total of forty eight accessions of barley landraces from Morocco were screened for resistance to powdery mildew. Twenty two (46%) of tested landraces showed resistance reactions and thirty four single plant lines were selected. Eleven of these lines were tested in seedling stage with seventeen and another twenty three lines with twenty three isolates of powdery mildew respectively. The isolates were chosen according to the virulence spectra observed on the 'Pallas' isolines differential set. Line 229-2-2 was identified with resistance to all prevalent in Europe powdery mildew virulence genes. Lines 230-1-1, 248-1-3 showed susceptible reaction for only one and lines 221-3-2, 227-1-1, 244-3-4 for only two isolates respectively. Three different resistance alleles (Mlat, Mla6, and MLA14) were postulated to be present in tested lines alone or in combination. In thirty (88%) tested lines it was impossible to determine which specific gene or genes for resistance were present. Most probably these lines possessed alleles not represented in the 'Pallas' isolines differential set. The distribution of reaction type indicated that about 71% of all reaction types observed were classified as powdery mildew resistance (scores 0, 1 and 2). Majority (79%) of resistance reaction types observed in tested lines was intermediate resistance reaction type two and twenty three lines (68%) showed this reaction for inoculation with more than 50% isolates used. The use of new effective sources of resistance from Moroccan barley landraces for diversification of resistance genes for powdery mildew in barley cultivars was discussed.

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Section: Discussionsupporting

confidence: 88%

Sources of powdery mildew resistance in barley landraces from morocco

Czembor¹

2000

Archives Of Phytopathology And Plant Protection

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“…These two genes together with Mlh (from ‘Hauters’) were among the first genes widely introduced in Europe, especially in winter barley (Brown and Jørgensen 1991). Nowadays, they are ‘defeated’ genes and virulences to La , g and h have been commonly reported in powdery mildew populations from North Africa and Europe (Yahyaoui et al. 1997, Hovmøller et al.…”

Section: Discussionmentioning

confidence: 99%

Analysis of powdery mildew resistance in the Spanish barley core collection

et al. 2011

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The Spanish Barley Core Collection, consisting of one hundred and fifty-nine landrace-derived inbred lines and sixteen cultivars, was characterized for resistance to powdery mildew (Blumeria graminis f. sp. hordei) using a set of 27 isolates with a wide spectra of virulences/avirulences on most of the genes expected to occur in Europe. No landrace-derived line and no cultivar were resistant to all the isolates but at least 3 landraces showed infection types below 2 for 23 isolates.Twenty-two landraces and one cultivar showed resistance against half of the isolates used. Eleven isolates were sufficient to separate the majority of resistance profiles. In total, thirty-four resistance spectra were detected and fourteen resistance genes/alleles were postulated alone or in combination:MlLa, Mlh, Mlg, Mla22, Mla7(Mlu), Mla7(Mlk), Mlk, Mla12, Mla9, Mla3, Mla6(Mla14), Mlra and Mla1. The majority of resistance spectra are composed only by one line. Resistance in twenty-one landrace-derived lines and four cultivars was based on either unidentified genes or combinations of known and unknown genes/alleles. Therefore, the SBCC may be a source for broadening the genetic base of powdery mildew resistance.

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“…MlLa and Mlg genes were also postulated to be present in a collection of barleys from Spain (Silvar et al 2011). Nowadays, they are ''defeated'' genes and virulences to La and g have been found in powdery mildew populations from North Africa and Europe (Yahyaoui et al 1997;Hovmøller et al 2000). Mlra and Mlt were mainly identified in Serbian landraces, but not in cultivars.…”

Section: Discussionmentioning

confidence: 99%

Exploring the Serbian GenBank barley (Hordeum vulgare L. subsp. vulgare) collection for powdery mildew resistance

Šurlan-Momirović

Flath

Silvar

et al. 2015

Genet Resour Crop Evol

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Unlocking resistance genes in genbank collections are of prime importance for securing sustainable crop production. In this regard, the Serbian GenBank barley collection, comprising 93 local landraces and 36 commercial cultivars and elite barley breeding lines, was screened for novel resistances to powdery mildew (Blumeria graminis f. sp. hordei) using a set of 28 isolates with a wide spectrum of virulences/avirulences. No line was resistant to all the isolates, but one and three accessions showed resistance to 27 and 26 isolates, respectively. Twenty landraces (21.51 %) and ten cultivars (27.78 %) exhibited resistance to 50 % of the isolates. Infection type 2 was most frequent among resistant accessions. Nine B. graminis isolates were sufficient for gene postulation in 73 barley lines. In total, thirty-five different resistance spectra were recorded and the following known resistance genes were postulated namely, Mlra, Mlh, Mla12, Mla7(Mlu), Mlg, MlLa, Mla6, Mla7, Mlt, Mla22, Mlat, Mla1, Mlk. The majority of resistance profiles was constituted by only one line. Unidentified genes alone or in combination were proposed for twenty landraces and six cultivars. This report demonstrated that the barley collection held at the Serbian GenBank could be exploited as a new source for powdery mildew resistance.

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**Virulence spectrum in populations of the barley powdery mildew pathogen, Erysiphe graminis f. sp. hordei in Tunisia and Morocco in 1992**

Cited by 19 publications

References 8 publications

Sources of powdery mildew resistance in barley landraces from morocco

Sources of powdery mildew resistance in barley landraces from morocco

Analysis of powdery mildew resistance in the Spanish barley core collection

Exploring the Serbian GenBank barley (Hordeum vulgare L. subsp. vulgare) collection for powdery mildew resistance

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