Identification of soils suppressive against Helminthosporium solani, the causal agent of potato silver scurf

Martinez, Carole; Michaud, Mélanie; Bélanger, Richard R.; Tweddell, Russell J.

doi:10.1016/s0038-0717(02)00199-2

Cited by 28 publications

(15 citation statements)

References 38 publications

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“…In addition, soil population levels were negatively correlated with S content in soil and positively correlated with Zn levels, as revealed by principal components analysis. Martinez et al (2002) showed correlations between soil nutrient factors and population levels of Helminthosporium solani, while Termorshuizen et al (2006) demonstrated that PCA analysis was an effective tool to minimize the dimensionality of variables to find components which explained the variability related to the suppressive effects of composts against different pathosystems.…”

Section: Discussionmentioning

confidence: 99%

“…The population density of F. equiseti in each sample was determined by dilution plating as described above. To determine if there were any correlations between soil parameters and population levels, principal components analysis (PCA) was conducted as described by other authors (Martinez et al 2002;Termorshuizen et al 2006). Principal components and correlation matrix was analyzed using SAS (version 9.2, SAS Institute Inc, Cary, NC) under multivariate analysis.…”

Section: Relationship Of Soil Factors To Population Levelsmentioning

confidence: 99%

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Growth, population dynamics, and diversity of Fusarium equiseti in ginseng fields

et al. 2008

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Fusarium equiseti is prevalent in ginseng soil, straw mulch and in ginseng root tissues and is the cause of a root surface discolouration on ginseng grown in British Columbia. Population levels of the fungus in ginseng fields ranged from 3.8×10 3 cfu g −1 soil to 1.4×10 4 cfu g −1 soil and were highest at 0-5 cm soil depths compared to 10-15 cm. Soil population levels were negatively correlated with S content in soil and positively correlated with Zn levels. Barley or wheat straw added to soil significantly increased population levels under laboratory conditions. Mycelial growth in culture was highest at 26-30°C and at pH 7.2-7.8. Samples of flowers and berries, and harvested seed, contained DNA of F. equiseti detected using a Fusarium-specific DNA array and the fungus was isolated from these tissues on agar medium. A high degree of genetic variation in the EF-1 alpha gene sequence was present among 52 isolates of F. equiseti which originated from ginseng fields. At least seven clades were identified. Inoculum dispersal from straw mulch used in ginseng gardens can result in seed contamination by the fungus. In addition, fungal growth near the soil surface under warm summer conditions can result in infection and crown discolouration of ginseng roots.

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Section: Discussionmentioning

confidence: 99%

Section: Relationship Of Soil Factors To Population Levelsmentioning

confidence: 99%

Growth, population dynamics, and diversity of Fusarium equiseti in ginseng fields

et al. 2008

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“…Previous works have reported the biocontrol ability of this bacterium against Pythium damping-off of sugarbeet (Shah-Smith and Burns, 1996) and safflower (Liang et al, 1996), durum wheat tan spot caused by Pyrenophora tritici-repentis (da Luz et al, 1998), potato silver scurf caused by In each column, means followed by the same letter are not significantly different (P > 0.05) according to the Fisher protected LSD test (n = 8). Helminthosporium solani (Elson et al, 1997;Martinez et al, 2002) and potato soft rot caused by Erwinia carotovora (Colyer and Mount, 1984). P. marginalis isolated from a mixture of peat and compost strongly reduced the incidence of damping-off caused by both pathogens.…”

Section: Discussionmentioning

confidence: 99%

Antagonist Microorganisms with the Ability to Control Pythium Damping-off of Tomato Seeds in Rockwool

et al. 2005

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A total of 237 microorganisms were isolated from five different greenhouse tomato growing media. Of those, 40 microorganisms reduced the in vitro mycelial growth of both Pythium aphanidermatum and Pythium ultimum. The ability of these microorganisms to control damping-off was then tested in rockwool. As a result, Pseudomonas corrugata strains 1 and 3, Pseudomonas fluorescens subgroup F and G strains 1, 2, 3, 4 and 5, Pseudomonas marginalis, Pseudomonas putida subgroup B strain 1, Pseudomonas syringae strain 1 and Pseudomonas viridiflava significantly reduced damping-off caused by P. ultimum or P. aphanidermatum. Pseudomonas marginalis was the only microorganism that significantly reduced damping-off caused by both pathogens.

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“…& Mont. (Martinez et al, 2002), Sclerotium rolfsii Sacc., Fusarium oxysporum Schl., and Pythium aphanidermatum (Edson) Fitzp. B. cereus has also been reported as endophytic in cotton (Gossypium hirsutum L), sweet corn (Zea mays L), and citrus plants (Citrus spp.)…”

Section: Resultsmentioning

confidence: 99%

Bioprospecting endophytic bacteria for biological control of coffee leaf rust

Shiomi¹,

Silva²,

Melo³

et al. 2006

Sci. agric. (Piracicaba, Braz.)

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Suppression of plant diseases due to the action of endophytic microorganisms has been demonstrated in several pathosystems. Experiments under controlled conditions involving endophytic bacteria isolated from leaves and branches of Coffea arabica L and Coffea robusta L were conducted with the objective of evaluating the inhibition of germination of Hemileia vastatrix Berk. & Br., race II, urediniospores and the control of coffee leaf rust development in tests with leaf discs, detached leaves, and on potted seedling of cv. Mundo Novo. The endophytic bacterial isolates tested proved to be effective in inhibiting urediniospore germination and/or rust development, with values above 50%, although the results obtained in urediniospore germination tests were inferior to the treatment with fungicide propiconazole. Endophytic isolates TG4-Ia, TF2-IIc, TF9-Ia, TG11-IIa, and TF7-IIa, demonstrated better coffee leaf rust control in leaf discs, detached leaves, and coffee plant tests. The endophytic isolates TG4-Ia and TF9-Ia were identified as Bacillus lentimorbus Dutky and Bacillus cereus Frank. & Frank., respectively. Some endophytic bacterial isolates were effective in controlling the coffee leaf rust, although some increased the severity of the disease. Even though a relatively small number of endophytic bacteria were tested, promising results were obtained regarding the efficiency of coffee leaf rust biocontrol. These selected agents appears to be an alternative for future replacement of chemical fungicide. Key words: Hemileia vastatrix, Coffea spp., Bacillus, biocontrol BIOPROSPECÇÃO DE BACTÉRIAS ENDOFÍTICAS COMO AGENTES DE BIOCONTROLE DA FERRUGEM DO CAFEEIRORESUMO: Supressão de doenças de plantas por microrganismos endofíticos tem sido demonstrada em diversos patossistemas. Neste trabalho foram selecionados isolados de bactérias endofíticas de folhas e ramos de cafeeiro com potencial para o controle biológico da ferrugem do cafeeiro, pois é conhecido que esses microrganismos podem possuir essa característica. Bactérias endofíticas isoladas previamente de folhas e ramos de Coffea arabica L e Coffea robusta L foram avaliadas quanto ao seu potencial de biocontrole da ferrugem do café causada pelo fungo Hemileia vastatrix Berk. & Br., raça 2. As bactérias foram testadas para a inibição da germinação de urediniosporos do fungo e em bioensaios para o controle do desenvolvimento da ferrugem alaranjada do cafeeiro em discos de folhas, folhas destacadas e mudas da cv. Mundo Novo. Os isolados de bactérias endofíticas testados demonstraram eficácia na inibição da germinação de urediniosporos e/ou no desenvolvimento da ferrugem, com valores acima de 50%, embora os resultados obtidos nos testes de germinação de urediniosporos tenham sido inferiores ao tratamento com propiconazole (testemunha padrão). Nos testes em discos de folhas, folhas destacadas e em plantas de cafeeiro, os isolados endofíticos TG4-Ia, TF2-IIc, TF9-Ia, TG11-IIa e TF7-IIa demonstraram melhor controle da ferrugem do cafeeiro. Os isolados endofíticos TG...

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Identification of soils suppressive against Helminthosporium solani, the causal agent of potato silver scurf

Cited by 28 publications

References 38 publications

Growth, population dynamics, and diversity of Fusarium equiseti in ginseng fields

Growth, population dynamics, and diversity of Fusarium equiseti in ginseng fields

Antagonist Microorganisms with the Ability to Control Pythium Damping-off of Tomato Seeds in Rockwool

Bioprospecting endophytic bacteria for biological control of coffee leaf rust

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