Isolation of mycoparasitic species of Pythium with spiny oogonia from soil in California

Ribeiro, W. R. C.; Butler, Edward E.

doi:10.1016/s0953-7562(09)81031-9

Cited by 20 publications

(9 citation statements)

References 21 publications

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“…In the present study, we have focused our attention on a common oomycete inhabitant of soils worldwide, Pythium oligandrum . It has been described as one of the most numerous species in several agricultural soils (Schmitthenner, ; Klemmer & Nakano, ; Vaartaja & Bumbieris, ; Kobayasi et al ., ; Plaats‐Niterink, ; Ali‐Shtayeh, ; Mulligan & Deacon, ; Ribeiro & Butler, ). Martin & Hancock () have found high propagule densities of P. oligandrum in soil that is suppressive to the pathogen, P. ultimum, in cotton fields in California.…”

Section: Introductionmentioning

confidence: 99%

Characterization ofPythium oligandrumpopulations that colonize the rhizosphere of vines from the Bordeaux region

Gerbore

Vallance

Yacoub

et al. 2014

FEMS Microbiol Ecol

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This study focused on one oomycete, Pythium oligandrum, well-known for its plant protection abilities, which thrives in microbial environment where bacteria and fungal communities are also present. The genetic structures and dynamics of fungal and bacterial communities were studied in three Bordeaux subregions with various types of soil, using single-strand conformation polymorphism. The structure of the fungal communities colonizing the rhizosphere of vines planted in sandy-stony soils was markedly different from that those planted in silty and sandy soils; such differences were not observed for bacteria. In our 2-year experiment, the roots of all the vine samples were also colonized by echinulated oospore Pythium species, with P. oligandrum predominating. Cytochrome oxidase I and tubulin gene sequencings showed that P. oligandrum strains clustered into three groups. Based on elicitin-like genes coding for proteins able to induce plant resistance, six populations were identified. However, none of these groups was assigned to a particular subregion of Bordeaux vineyards, suggesting that these factors do not shape the genetic structure of P. oligandrum populations. Results showed that different types of rootstock and weeding management both influence root colonization by P. oligandrum. These results should prove particularly useful in improving the management of potentially plant-protective microorganisms.

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Section: Introductionmentioning

confidence: 99%

Characterization ofPythium oligandrumpopulations that colonize the rhizosphere of vines from the Bordeaux region

Gerbore

Vallance

Yacoub

et al. 2014

FEMS Microbiol Ecol

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“…However, P. oligandrum, probably because it is a common inhabitant in many soils, is the organism that has been the focus of more detailed investigations (Ali, 1985;Ribeiro & Butler, 1992). It is worth mentioning that the antagonism exerted by P. oligandrum against pathogenic Pythium species represents a rather rare and unique situation in biological control since the biocontrol agent is from the same genus as the pathogen it is controlling (Lévesque, 2011).…”

Section: Introductionmentioning

confidence: 99%

Pythium oligandrum: an example of opportunistic success

et al. 2012

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Pythium oligandrum, a non-pathogenic soil-inhabiting oomycete, colonizes the root ecosystem of many crop species. Whereas most members in the genus Pythium are plant pathogens, P. oligandrum distinguishes itself from the pathogenic species by its ability to protect plants from biotic stresses in addition to promoting plant growth. The success of P. oligandrum at controlling soilborne pathogens is partly associated with direct antagonism mediated by mycoparasitism and antimicrobial compounds. Interestingly, P. oligandrum has evolved with specific mechanisms to attack its prey even when these belong to closely related species. Of particular relevance is the question of how P. oligandrum distinguishes between self-and non-self cell wall degradation during the mycoparasitic process of pathogenic oomycete species. The ability of P. oligandrum to enter and colonize the root system before rapidly degenerating is one of the most striking features that differentiate it from all other known biocontrol fungal agents. In spite of this atypical behaviour, P. oligandrum sensitizes the plant to defend itself through the production of at least two types of microbe-associated molecular patterns, including oligandrin and cell wall protein fractions, which appear to be closely involved in the early events preceding activation of the jasmonic acid-and ethylene-dependent signalling pathways and subsequent localized and systemic induced resistance. The aim of this review is to highlight the expanding knowledge of the mechanisms by which P. oligandrum provides beneficial effects to plants and to explore the potential use of this oomycete or its metabolites as new disease management strategies.

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“…Our studies revealed the presence of P. oligandrum DNA in samples treated with Polyversum WP, but also in combinations where the biopreparation was not used. According to Van der Plaats-Niterink [1981], Ribeiro and Butler [1992] and Rey et al [2008], non-plant-pathogenic oomycete P. oligandrum is a common inhabitant of soils and, as Gerbore et al [2014] showed based on numerous literature data, it has been isolated from the rhizosphere of many plants. This explains its presence in combinations untreated with biopreparation.…”

Section: Discussionmentioning

confidence: 99%

DEVELOPMENT OF Sclerotinia sclerotiorum (Lib.) de Bary ON STORED CARROT TREATED WITH Pythium oligandrum Drechsler DETERMINED BY qPCR ASSAY

Baturo‐Cieśniewska

Łukanowski

Koczwara

et al. 2018

Acta Sci.Pol.Hortorum Cultus

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Sclerotinia scletoriorum (Lib.) de Bary is a serious pathogen of carrots that can cause up to 50% losses of stored roots. Fungicides were found not to be completely effective for its control and due to residues they are not permitted for the use in storage. Biological control agents such as Pythium oligandrum may be a chance. The aim of research was to determine the level of carrot infection with S. sclerotiorum during few-month storage with qPCR and the potential control ability of this pathogen by Polyversum WP containing oospores of P. oligandrum. We analyzed carrot roots in combinations treated with Polyversum WP on the field, fumigated with biopreparation before storage and untreated control. S. sclerotiorum developed on carrots treated and untreated with Polyversum WP. During the storage, pathogen was isolated from 44.4% samples and P. oligandrum from 53.8% ones, respectively in the range from 0.0001 to 130 200.0; pg and from 0.004 to 0.3440 pg per sample. The number of roots with S. sclerotiorum and degree of their infection increased with prolonged storage. Analyses suggest that Polyversum WP may potentially limit the growth of S. sclerotiorum.

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Isolation of mycoparasitic species of Pythium with spiny oogonia from soil in California

Cited by 20 publications

References 21 publications

Characterization ofPythium oligandrumpopulations that colonize the rhizosphere of vines from the Bordeaux region

Characterization ofPythium oligandrumpopulations that colonize the rhizosphere of vines from the Bordeaux region

Pythium oligandrum: an example of opportunistic success

DEVELOPMENT OF Sclerotinia sclerotiorum (Lib.) de Bary ON STORED CARROT TREATED WITH Pythium oligandrum Drechsler DETERMINED BY qPCR ASSAY

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