Effect of susceptible and resistant canola plants on <i>Plasmodiophora brassicae</i> resting spore populations in the soil

Hwang, Sheau‐Fang; Ahmed, Hammad; Zhou, Qiaoxia; Rashid, A.; Strelkov, Stephen E.; Gossen, B. D.; Peng, Gary; Turnbull, G. D.

doi:10.1111/j.1365-3059.2012.02636.x

Cited by 45 publications

(37 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A single generation of infected plants increased the spore load in soil infested with 1 × 10 6 resting spores per mL by 60-fold (Hwang et al, 2012a). In contrast, resting spore populations decline under continuous fallow or repeated cropping of a resistant cultivar at a rate equivalent to a half-life of 4.4 years, which was slightly longer than that observed in Sweden (Wallenhammar, 1996).…”

Section: Baiting Cropsmentioning

confidence: 95%

“…However, the observation that resistant canola plants exhibit reduced growth and delayed development when inoculated with resting spores of an avirulent pathotype (Hwang et al, 2012a) indicates that resistance is an active process. The observation that starch accumulation in amyloplasts is strongly affected by clubroot development in both vegetables (Tanaka et al, 2006;Donald et al, 2008) and canola (M.R.…”

Section: Resistancementioning

confidence: 97%

“…However, the infection success and rate of pathogen development in root hairs differs slightly among cultivars, with development occurring quickly in susceptible lines, more slowly in highly resistant lines, and slower still in lines with intermediate resistance (Deora et al, 2012;Hwang et al, 2012a).…”

Section: Resistancementioning

confidence: 98%

See 2 more Smart Citations

A comparison of clubroot development and management on canola and Brassica vegetables

Gossen

McDonald

Hwang

et al. 2013

Canadian Journal of Plant Pathology

View full text Add to dashboard Cite

A comparison of clubroot development and management on canola and Brassica vegetables, Canadian Journal of Plant Pathology, 35:2, 175-191, Abstract: Clubroot of canola was identified for the first time on the Canadian prairies in 2003, and is spreading rapidly across the region.Although clubroot has been studied extensively on vegetable Brassica crops, it was not clear initially how much of the information would be directly transferable from the intensive production of vegetable crops to the extensive production practices used for canola. This review examines similarities and differences between clubroot development and management on vegetable crops and canola. One important difference was that clubroot generally has a larger economic impact on canola, which is harvested for seed, than on vegetables, especially those where early vegetative growth is the marketable component. Also, clubroot has spread within the production area more quickly than was expected based on vegetable production. This occurs in large part because the resting spores are readily moved within and between fields on the heavy machinery used for canola production, but movement of spores by wind and water is also being assessed. Interestingly, crop rotation to reduce yield losses may be a more viable approach for canola than in vegetable production. Resistance to clubroot is the most consistent and economically viable approach to clubroot management in canola, but several lines of evidence indicate that this resistance may not be durable. Fortunately, the large acreage of canola production in Canada ensures that new sources of resistance will be developed and deployed as existing sources are eroded. Pathogen development and cultural control are very similar on vegetables and canola; bait crops and soil amendments are generally not commercially viable in either system; and biocontrol has a limited potential at this time. Manipulation of seeding date, application of fungicide, and soil fumigation generally have more potential for use in vegetable production than for canola. Identification of approaches that reduce disease pressure in clubroot-infested fields and increase the durability and diversity of genes for clubroot resistance represent important lines of future research.Résumé: La hernie des crucifères a été détectée pour la première fois dans des cultures de canola sur les Prairies canadiennes en 2003. Cette maladie continue d'envahir la région à un rythme accéléré. Cette maladie a fait l'objet de nombreuses études chez les cultures maraîchères du genre Brassica et nous ne savions pas, initialement, quelles informations dérivées de la production intensive des cultures maraîchères seraient pertinentes pour la culture à grande échelle du canola. Cet article de synthèse examine les similitudes et les différences entre l'évolution et la gestion de la hernie chez les cultures maraîchères et le canola. Une différence importante est le plus grand impact économique de la hernie sur le canola, qui est cultivé pour sa graine, que sur les cultures mar...

show abstract

Section: Baiting Cropsmentioning

confidence: 95%

Section: Resistancementioning

confidence: 97%

See 1 more Smart Citation

A comparison of clubroot development and management on canola and Brassica vegetables

Gossen

McDonald

Hwang

et al. 2013

Canadian Journal of Plant Pathology

View full text Add to dashboard Cite

show abstract

“…Eine Wurzelgalle kann über 20 g wiegen, 1 g Wurzelgallengewebe enthält 10 8 bis 10 10 Sporen (Diederichsen et al 2009;Hwang et al 2013). Neuere Untersuchungen zeigen, dass bereits bei geringen Sporenkonzentrationen von 10 3 Sporen pro g Boden Rapsertragsverluste von 30 % entstehen können (Strehlow und Struck 2013).…”

unclassified

Standorteigenschaften und Anbaumanagement erklären regionale Unterschiede im Kohlherniebefall in Deutschland

2014

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

“…Hwang et al (2013) counted the number of resting spores in clubs of susceptible canola after inoculation with different spore con centration. After cropping the resistant OSR, mean DS of the subsequent susceptible OSR was even lower com pared with DS before repeated cropping of OSR at the lowest initial inoculum density.…”

Section: Id (Spores Liter-1 Soil) Osr Cultivar DI (%) Dsmentioning

confidence: 99%

Risk Potential of Clubroot Disease on Winter Oilseed Rape

2015

View full text Add to dashboard Cite

Strehlow, B., de Mol, F., and Struck, C. 2015. Risk potential of clubroot disease on winter oilseed rape. Plant Dis. 99:667-675. Clubroot disease caused by Plasmodiophora brassicae is an important dis ease of cruciferous plants. Although the pathogen is widespread and has been reported to cause high yield losses, the impact on winter oilseed rape (OSR) has not been experimentally verified. To quantify the risk potential of P. brassicae, we conducted two closely linked experiments. A semicontrolled experiment used artificial soil infestation at inoculum densities be tween 10® and 108 spores liter-1 of soil to detect the impact on seed yield and yield components of a susceptible and resistant OSR cultivar. A green house experiment was implemented using the soil of the semicontrolled experiment after cropping the two cultivars to quantify the influence of cultivar resistance on soil inoculum. According to cumulative link mixed models, disease rating was positively correlated with the amount of inoc ulum. Linear regression analyses revealed a negative correlation between seed yield and inoculum density. Yield losses of 60% already appeared at the lowest inoculum density. Plant losses and reduced seed per pod were accountable for yield losses. Although the resistant cultivar showed club root symptoms, seed yield was not affected by the pathogen. The green house experiment revealed that clubroot severity in subsequent OSR was reduced after cropping the resistant cultivar. This study showed signif icant yield damage of P. brassicae already at low infestation levels.

show abstract

Effect of susceptible and resistant canola plants on Plasmodiophora brassicae resting spore populations in the soil

Cited by 45 publications

References 33 publications

A comparison of clubroot development and management on canola and Brassica vegetables

A comparison of clubroot development and management on canola and Brassica vegetables

Standorteigenschaften und Anbaumanagement erklären regionale Unterschiede im Kohlherniebefall in Deutschland

Risk Potential of Clubroot Disease on Winter Oilseed Rape

Contact Info

Product

Resources

About