Microbial community shifts in Pythium ultimum-inoculated suppressive substrates

Hagn, Alexandra; Engel, Marion; Kleikamp, Bernd; Munch, Jean Charles; Schloter, Michael; Bruns, Christian

doi:10.1007/s00374-007-0230-x

Cited by 20 publications

(12 citation statements)

References 37 publications

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“…For each sample, the first number represents the date of sampling (1, start; 2, middle; 3, end of the cropping season), the second number refers to the compartment (1, greenhouse 1; 2, greenhouse 2), the letters T and P are for control plants and P. oligandrum-inoculated plants, respectively, and the last letter indicates the sample. (16) suggested that changes in the microbial communities of the rhizosphere are a consequence of both root damage caused by Pythium ultimum and secondary colonization due to the resulting nutrient leakage. Calvo-Bado et al (6) reported that the microbial communities established early on the roots of tomatoes grown in soilless systems are robust and resistant to the effect(s) of the introduction of oomycete pathogens or of switching from a recirculating to a run-to-waste nutrient supply.…”

Section: Discussionmentioning

confidence: 99%

“…These methods effectively destroy pathogenic microorganisms but are harmful to species liable to benefit the plant, to be used as biocontrol agents, or both. Indeed, recirculation of nutrient solutions in closed hydroponic systems favors the establishment of a potentially suppressive microflora besides the pathogenic microflora (16,28,39,41). The development of a beneficial microflora may thus be impeded by treatments used to destroy pathogenic microorganisms.…”

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confidence: 99%

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Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Vallance

Floch

Déniel

et al. 2009

Appl Environ Microbiol

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Fungal and oomycete populations and their dynamics were investigated following the introduction of the biocontrol agent Pythium oligandrum into the rhizosphere of tomato plants grown in soilless culture. Three strains of P. oligandrum were selected on the basis of their ability to form oospores (resting structures) and to produce tryptamine (an auxin-like compound) and oligandrin (a glycoprotein elicitor). Real-time PCR and plate counting demonstrated the persistence of large amounts of the antagonistic oomycete in the rhizosphere throughout the cropping season (April to September). Inter-simple-sequence-repeat analysis of the P. oligandrum strains collected from root samples at the end of the cropping season showed that among the three strains used for inoculation, the one producing the smallest amount of oospores was detected at 90%. Single-strand conformational polymorphism analysis revealed increases in the number of members and the complexity of the fungal community over time. There were no significant differences between the microbial ecosystems inoculated with P. oligandrum and those that were not treated, except for a reduction of Pythium dissotocum (ubiquitous tomato root minor pathogen) populations in inoculated systems during the last 3 months of culture. These findings raise interesting issues concerning the use of P. oligandrum strains producing elicitor and auxin molecules for plant protection and the development of biocontrol.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Vallance

Floch

Déniel

et al. 2009

Appl Environ Microbiol

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“…There is no consensus about whether shifts in the rhizosphere microflora can result from pathogenic attacks. Indeed, changes in the microbial communities of the rhizosphere could be a consequence of both root damage caused by pathogens such as P. ultimum and secondary colonisation due to the resulting nutrient leakage (Naseby et al, 2000;Hagn et al, 2008). On the other hand, it has been reported that the microbial communities established early on the roots of tomatoes grown in soilless systems were robust and resistant to the effect(s) of the introduction of oomycete pathogens or of switching from a recirculating to a run-to-waste nutrient supply (Calvo-Bado et al, 2006).…”

Section: Evolution Of Microbial Communitiesmentioning

confidence: 99%

Pathogenic and beneficial microorganisms in soilless cultures

Vallance

Déniel

Floch

et al. 2011

Agronomy Sust. Developm.

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Another example is the application of organic compost, which helps to establish high suppressiveness of the soil against root pathogens (Hagn et al. , 2008) and can help to induce plant defences.…”

Section: The Question Of Interference: Functionality Versus Resiliencementioning

confidence: 99%

“…Another example is the application of organic compost, which helps to establish high suppressiveness of the soil against root pathogens (Hagn et al, 2008) and can help to induce plant defences. On the functionality-resilience continuum, should this practice be assessed in the same way as spraying synthetic fungicides for the control of the same pathogens?…”

Section: The Role Of Functionality Versus Resilience In Chemical and mentioning

confidence: 99%

Concepts of plant health – reviewing and challenging the foundations of plant protection

et al. 2011

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Plant health is a frequently used but ill-defined term. However, there is an extensive literature on general health definitions and health criteria in human medicine. Taking up ideas from these philosophical debates, concepts of plant health are reviewed and a framework developed to locate these concepts according to their position in several philosophical controversies. In particular, (i) the role of values in defining plant health in a naturalist versus a normativist approach; (ii) negative and positive definitions of plant health; (iii) reductionist versus holistic perspectives; (iv) the focus on functionality versus resilience, i.e. the ability of the plant to perform under stress with or without human interference; (v) materialist versus vitalist approaches; and (vi) biocentric versus anthropocentric views, are surveyed. The ways in which these perspectives relate to mainstream and alternative approaches to plant protection are explored and we suggest how the contradicting views might be reconciled. It is argued that none of these perspectives is without inherent contradictions, but that by combining contrasting approaches it is possible to provide a comprehensive though fuzzy concept. Rather than giving a new definition of plant health, a conceptual framework is developed that suggests what questions may be answered in debates on plant health issues and how such debates could be organized.

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Microbial community shifts in Pythium ultimum-inoculated suppressive substrates

Cited by 20 publications

References 37 publications

Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Pathogenic and beneficial microorganisms in soilless cultures

Concepts of plant health – reviewing and challenging the foundations of plant protection

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