Observations on the Behaviour of Resting Spores of Plasmodiophora Brassicae in the Presence of Cruciferous and Non-Cruciferous Plant Roots

Kowalski, Kurt P.; Bochow, H.

doi:10.17660/actahortic.1996.407.53

Cited by 14 publications

(9 citation statements)

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“…pekinensis had only a weakly significant influence on spore germination ( Figure 3). Although many authors mention that spores of P. brassicae react specifically to the presence of host plant roots (Macfarlane, 1970;Takahashi, 1991;Wallenhammar, 1999), this was not observed in the present study, similarly to Suzuki et al (1992) and Kowalski and Bochow (1996). Suzuki et al (1992) found a GSF not only in exudate solutions from a susceptible cultivar of Brassica campestris but also from a resistant cultivar and a non-host plant (Lactuca sativa).…”

Section: Discussioncontrasting

confidence: 56%

“…The authors suggest that the GSF is neither related to susceptibility nor restricted to crucifers. Kowalski and Bochow (1996), using other non-hosts plants, draw the same conclusion. In contrast, Narita and Nishiyama (1955) found that juice from crushed crucifer roots had a germination-stimulating effect on the spores, whereas juice from other plants was inhibitory.…”

Section: Introductionsupporting

confidence: 57%

“…Suzuki et al (1992) found a GSF not only in exudate solutions from a susceptible cultivar of Brassica campestris but also from a resistant cultivar and a non-host plant (Lactuca sativa). Kowalski and Bochow (1996) On the other hand, Narita and Nishiyama (1955) found that sap from crushed roots of host plants (varieties of B. rapa) stimulated germination whereas sap from L. esculentum, Triticum aestivum and Avena sativa had an inhibitory effect. The hypothesis of host-specific germination stimulation of P. brassicae resting spores should be tested further before any general conclusions can be drawn.…”

Section: Discussionmentioning

confidence: 99%

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Germination of Plasmodiophora brassicae resting spores stimulated by a non-host plant

2005

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Plant-induced germination of Plasmodiophora brassicae resting spores was studied in a laboratory experiment. Spore reaction was analysed in nutrient solution with exudates from growing roots of different plant species -one host plant (Brassica rapa var. pekinensis) and four non-host plants (Lolium perenne, Allium porrum, Secale cereale and Trifolium pratense) -and in controls with distilled water and nutrient solution. It was found that root exudates from L. perenne stimulated spore germination more than exudates from the other plants, including those from the host plant. The effect could not be explained by differences in the nutritional composition of the solutions due to differential uptake of the plant species, or by differences in root activity, measured as exudation of soluble sugars. This is the first time such a separation of factors has been done in analysing the influence of plants on P. brassicae germination. Although stimulation of P. brassicae resting spore germination is not restricted to the presence of host plants, it seems to vary depending on the plant species.

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Section: Discussioncontrasting

confidence: 56%

Section: Introductionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

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Germination of Plasmodiophora brassicae resting spores stimulated by a non-host plant

2005

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“…Germination of resting spores is stimulated by specific host plant root exudates (Kowalski and Bochow 1996). Favourable conditions for clubroot development, apart from the high share of host plants in sowing structure, are moderate air and soil temperature (optimally ca 22-24°C) and high soil humidity, frequently related to non-regulated water relationships.…”

Section: Introductionmentioning

confidence: 99%

Clubroot (Plasmodiophora Brassicae) - A Threat for Oilseed Rape

Korbas¹,

Jajor²,

Budka³

2009

Journal of Plant Protection Research

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Clubroot presents a serious threat to cultures of oilseed rape, especially if the share of this plant species in sowing structure is high. This is related to a long-lasting survival of pathogens resting spores in soil. The casual disease agent is Plasmodiophora brassicae Woronin -an obligatory, internal pathogen of Brassicae family which causes the formation of tumors on roots and hypocotyls. Plants with disease symptoms have a confined ability of nutrients' and water uptake and this may cause considerable losses in quantity and quality of potential yield. Monitoring performed in cultivation areas and the information obtained from farmers allowed to confirm a threat of disease occurrence in several voivodeships. At the same time there is a serious danger of the infection spread to other regions of oilseed rape crops.Confining plant infection by clubroot pathogen may be obtained mainly by applying a correct crop rotation, and also by providing resistant varieties for cultivation. In the performed greenhouse experiment, reaction to the infection caused by P. brassicae of chosen winter oilseed rape cultivars was studied. The degree of plant infection was assessed at the growth phase of green bud. It was stated that cv. Mendel revealed significantly the lowest degree of infection, as compared to the other studied cultivars. The other tested varieties were infested in a differentiated degree, however these differences were mostly not confirmed statistically. The infection level was mainly dependent on places of soil derivation.

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“…Fallow treatments without plants have often demonstrated reductions in resting spore persistence equivalent to the most promising nonhost crops (Ikegami, 1985; Robak, 1994, 1996). Under laboratory conditions, resting spores in aqueous solutions have been stimulated to germinate in the presence of plant roots, but the influence of different plant species is variable (Narita & Nishiyama, 1955; Bochow, 1965; Suzuki et al ., 1992; Kowalski & Bochow, 1996).…”

Section: Introductionmentioning

confidence: 99%

Usefulness of nonhost plants in managing Plasmodiophora brassicae

Friberg¹,

Lagerlöf

Rämert

2006

Plant Pathology

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Germination of resting spores of Plasmodiophora brassicae , causal agent of clubroot in crucifers, may be stimulated by certain nonhost plants. Without a host plant to infect, such germination would lead to a reduced persistence of resting spores in the soil. The effect of four nonhost plants on P. brassicae was investigated in a 3-year field experiment and a 14-month glasshouse experiment. Three of the plant species used, leek ( Allium porrum ), winter rye ( Secale cereale ) and perennial ryegrass ( Lolium perenne ), have been reported to stimulate resting spore germination, while the fourth, red clover ( Trifolium pratense ), does not. In the field experiment, none of the plant species reduced the concentration of P. brassicae in soils when tested with bioassay plants (Chinese cabbage, Brassica rapa var. pekinensis ). In the glasshouse experiment, there was a lower disease level in all plant treatments compared with the plant-free control following incorporation and decomposition of plant roots. At this time, pH in the soils with plant treatments was higher than that in the control soil. There were no indications of a species-specific interaction between any of the nonhost plants investigated and P. brassicae , and it cannot be concluded that any of them would be useful in the sanitation of P. brassicae -infested soils within short time periods.

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Observations on the Behaviour of Resting Spores of Plasmodiophora Brassicae in the Presence of Cruciferous and Non-Cruciferous Plant Roots

Cited by 14 publications

References 0 publications

Germination of Plasmodiophora brassicae resting spores stimulated by a non-host plant

Germination of Plasmodiophora brassicae resting spores stimulated by a non-host plant

Clubroot (Plasmodiophora Brassicae) - A Threat for Oilseed Rape

Usefulness of nonhost plants in managing Plasmodiophora brassicae

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