History of Oilseed Rape Cropping and Geographic Origin Affect the Genetic Structure of<i>Plasmodiophora brassicae</i>Populations

Strehlow, B.; Mol, Friederike de; Struck, Christine

doi:10.1094/phyto-07-13-0210-r

Cited by 24 publications

(14 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…(), who classified collected German isolates as P1, P3 and P6, respectively. Moreover, the diversity of virulence found in different areas of Germany, observed in the present study, is in close agreement with the degree of genetic variation found in the P. brassicae populations identified using AFLP, in which every field isolate showed a unique genotype pattern (Strehlow et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Variation in pathotypes and virulence of Plasmodiophora brassicae populations in Germany

Zamani-Noor

2016

Plant Pathology

View full text Add to dashboard Cite

Between 2012 and 2015, 49 new clubroot‐infested fields were identified in 12 German federal states. Clubroot disease incidence varied within these fields from 22% to 92%. Field information revealed that in 85% of fields, oilseed rape was grown in rotation once every 2 or 3 years. Frequency of OSR in the rotation was significantly correlated with the incidence and prevalence of clubroot disease. The disease was detected in fields with soil pH ranging from 5.1 to 8.3, and a significant negative correlation was found between soil pH and the disease incidence of infested fields. Furthermore, more cases of disease and severe incidences were observed in sandy loam and loamy sand as compared with other soil types. Pathotype classification of the 49 Plasmodiophora brassicae populations was conducted on two differential sets, the European Clubroot Differential set and the set of Somé (1996). Additionally, the degree of virulence of the collected isolates was analysed on the clubroot‐resistant oilseed rape cv. Mendel. The results showed variation in pathotype distribution in different regions in Germany. The majority of isolates according to Somé were pathotypes 1 and 3, respectively, with pathotypes 2 and 5 in the minority. Detailed classification according to Buczacki showed the dominance of 16/31/31, 16/14/30 and 16/14/31 populations among 20 distinct virulence patterns of collected isolates. From all populations tested for virulence on cv. Mendel, 15 isolates were found to be moderately or highly virulent. These virulent populations were not restricted to a small geographical area in the country.

show abstract

Section: Discussionmentioning

confidence: 97%

Variation in pathotypes and virulence of Plasmodiophora brassicae populations in Germany

Zamani-Noor

2016

Plant Pathology

View full text Add to dashboard Cite

show abstract

“…These results suggested that the investigated field isolates are genetically uniform and stable, although we cannot exclude a possibility that one pathotype might be dominant and others might be present at a low frequency and easily overlooked. Strehlow et al (2014) presented that the 59 field isolates exhibited a unique genotype pattern depending on the regions or fields. The authors proposed that the geographic differentiation resulted from low levels of gene flow due to the limited dispersal of the soilborne pathogen P. brassicae and from the localized selection pressure as a unifying force on the genotypes of the host (Strehlow et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Strehlow et al (2014) presented that the 59 field isolates exhibited a unique genotype pattern depending on the regions or fields. The authors proposed that the geographic differentiation resulted from low levels of gene flow due to the limited dispersal of the soilborne pathogen P. brassicae and from the localized selection pressure as a unifying force on the genotypes of the host (Strehlow et al, 2014). Thus, the collection and characterization of field isolates showing different pathogenicities would be useful for breeding of CR Chinese cabbage.…”

Section: Discussionmentioning

confidence: 99%

Pathotype Classification of Plasmodiophora brassicae Isolates Using Clubroot-Resistant Cultivars of Chinese Cabbage

Kim

Choi

et al. 2016

The Plant Pathology Journal

View full text Add to dashboard Cite

Clubroot disease caused by Plasmodiophora brassicae is one of the most serious diseases in Brassica crops worldwide. In this study, the pathotypes of 12 Korean P. brassicae field isolates were determined using various Chinese cabbage including 22 commercial cultivars from Korea, China, and Japan, and 15 inbred lines. All P. brassicae isolates exhibited the typical clubroot disease on non-clubroot resistant cultivar, indicating that the isolates were highly pathogenic. According to the reactions on the Williams’ hosts, the 12 field isolates were initially classified into five races. However, when these isolates were inoculated onto clubroot-resistant (CR) cultivars of Chinese cabbage, several isolates led to different disease responses even though the isolates have been assigned to the same race by the Williams’ host responses. Based on the pathogenicity results, the 12 field isolates were reclassified into four different groups: pathotype 1 (GN1, GN2, GS, JS, and HS), 2 (DJ and KS), 3 (HN1, PC, and YC), and 4 (HN2 and SS). In addition, the CR cultivars from Korea, China, and Japan exhibited distinguishable disease responses to the P. brassicae isolates, suggesting that the 22 cultivars used in this study, including the non-CR cultivars, are classified into four different host groups based on their disease resistance. Combining these findings, the four differential hosts of Chinese cabbage and four pathotype groups of P. brassicae might provide an efficient screening system for resistant cultivars and a new foundation of breeding strategies for CR Chinese cabbage.

show abstract

“…Dennoch konnten unsere Untersuchungen zeigen, dass Sandgehalte von 30 bis 35 % und niedrige Boden-pH-Werte von unter 5,6 auf Praxisschlägen mit einem hohen Kohlherniebefall korrelieren. tisch sehr unterschiedlich sind (Strehlow et al 2014), was mit einer fehlenden Vermischung der Feldisolate durch Verschleppung verseuchter Erde begründet wurde.…”

Section: Diskussionunclassified

Standorteigenschaften und Anbaumanagement erklären regionale Unterschiede im Kohlherniebefall in Deutschland

2014

Self Cite

View full text Add to dashboard Cite

Befallsintensitäten aufwiesen. In unserer Untersuchung beeinflussten die Bodenart, der Sandgehalt sowie der BodenpH-Wert das Vorkommen von P. brassicae. Bodenarten mit Sandgehalten von 30 bis 35 % und niedrigen BodenpH-Werten von unter 5,6 korrelierten auf den untersuchten Praxisschlägen mit hohen Befallsintensitäten. Schlüsselwörter Regionales Auftreten · Einflussfaktoren · Brassica napus · WinterrapsAbstract In the years 2013 and 2014 the presence and the infestation level of Plasmodiophora brassicae in six federal states of Germany were assessed using a bioassay method. Soils were sampled from 237 oilseed rape fields and the farmers provided information about the soil type, the soil pH values and the last year of oilseed rape cultivation. Clubroot was detected in 66 % of the fields investigated with a mean disease severity (BI) of 0.34. Between and within the federal states differences in presence and infestation level of P. brassicae were detected. In Schleswig-Holstein significantly more fields were infected by P. brassicae (90 %) and BI was relatively high (0.49) compared to Lower Saxony, Mecklenburg-Western Pomerania and North Rhine-Westphalia with 50 % infected fields and a mean BI of 0.27. Highly infested fields (BI > 0.8) were prevalent on 15 and 25 % of fields investigated in every federal state. Within the federal states the soil climate regions (BKR) differed significantly from each other. In BKR with light and sandy soils P. brassicae was less widespread compared to neighboring BKR with loamy soils. In addition, BKR with high infestation levels on fields invesZusammenfassung Um die Verbreitung und die Befallsintensität von Plasmodiophora brassicae in Deutschland zu erfassen, wurden in den Jahren 2013 und 2014 Bodenproben von insgesamt 237 Rapsflächen in sechs Bundesländern mit Hilfe eines Biotests untersucht. Durch Befragung der Landwirte wurden der Boden-pH-Wert, die Bodenart und das letzte Rapsanbaujahr der Untersuchungsstandorteerhoben. Insgesamt waren 66 % der untersuchten Flächen mit Kohlhernie befallen, und der mittlere Befallsindex lag bei 0,34. Signifikante Unterschiede im Pathogenauftreten und in der Befallsintensität traten sowohl zwischen als auch innerhalb der untersuchten Bundesländer auf. In Schleswig-Holstein waren 90 % der untersuchten Flächen mit Kohlhernie befallen und der mittlere Befallsindex lag bei 0,49. In Mecklenburg-Vorpommern, Niedersachsen und Nordrhein-Westfalen waren ca. 50 % der beprobten Flächen mit Kohlhernie befallen und hatten einen mittleren Befallsindex von 0,27. Der Anteil der Flächen mit einem sehr hohen Befallsindex von über 0,8 lag in allen untersuchten Bundesländern zwischen 15 und 25 %. Innerhalb der Bundesländer unterschieden sich die Bodenklimaräume (BKR) signifikant im Pathogenauftreten und der Befallsintensität: Die untersuchten Flächen der BKR, in denen leichte Sandböden dominieren, wie z. B. das Landesinnere von Mecklenburg-Vorpommern und die Geestböden in Schleswig-Holstein, wiesen mehr befallsfreie Fläche auf als die besseren diluvialen Böden in angr...

show abstract

History of Oilseed Rape Cropping and Geographic Origin Affect the Genetic Structure ofPlasmodiophora brassicaePopulations

Cited by 24 publications

References 55 publications

Variation in pathotypes and virulence of Plasmodiophora brassicae populations in Germany

Variation in pathotypes and virulence of Plasmodiophora brassicae populations in Germany

Pathotype Classification of Plasmodiophora brassicae Isolates Using Clubroot-Resistant Cultivars of Chinese Cabbage

Standorteigenschaften und Anbaumanagement erklären regionale Unterschiede im Kohlherniebefall in Deutschland

Contact Info

Product

Resources

About