Effective dose of a microbial inoculant is one to four cells in the rhizosphere

Normander, Bo; Hendriksen, Niels Bohse

doi:10.1139/w02-088

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…By using the plant-microorganism combination, the microorganism is added to soil along with a niche (the plant root) supporting its growth thus increasing the likelihood for the microorganisms' survival. 158 Siciliano and Germida 210 have demonstrated the potential of plantmicrobial associations for bioaugmentation of contaminated soil. The researchers inoculated the seed of Dahurian wild rye with Pseudomonas aeruginosa R75 and Pseudomonas savastanoi CB35, which had previously been shown to enhance phytoremediation.…”

Section: Phytoremediationmentioning

confidence: 99%

New Approaches for Bioaugmentation as a Remediation Technology

Gentry

Rensing

Pepper

2004

Critical Reviews in Environmental Science and Technology

283

124

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Section: Phytoremediationmentioning

confidence: 99%

New Approaches for Bioaugmentation as a Remediation Technology

Gentry

Rensing

Pepper

2004

Critical Reviews in Environmental Science and Technology

283

124

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“…AFPs have been used most simply to tag a Pseudomonas strain of interest in order to monitor its interaction with a host plant [159][160][161][162][163][164]. The dual labeling of strains with autofluorescent proteins which emit light at different spectra [165], as well as combinations of AFPs with other expression systems, can be useful in identifying the effects of multiple bacterial interactions.…”

Section: In Situ Analysis Of Pseudomonas-plant Interactionsmentioning

confidence: 99%

Pseudomonas–Plant Interactions

et al. 2008

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Pseudomonas is a diverse genus containing a large number of species with a variety of catabolic and metabolic abilities. This diversity allows for the colonization of an array of environmental niches and interactions with a wide range of eukaryotic hosts as saprotrophs, endophytes, commensals, plant pathogens and opportunistic human pathogens [1][2][3][4][5]. Pseudomonas species are of great interest to researchers in the fields of plant, soil and human-associated microbiology, and as such the genomic sequences of a range of Pseudomonas strains have been determined or are currently in progress (Table 13.1). Pseudomonas-plant interactions are found ubiquitously in nature and encompass a growing number of plant species, many of which are important to commercial horticulture. These interactions fall into two general groups: those that are beneficial and those that are detrimental to the host plants health (Figure 13.1). Pseudomonas sp. which successfully interact with plant hosts ultimately gain an advantage over the competing microorganisms in the immediate environment. This is usually achieved by occupying an exclusive niche provided by the plants surfaces and obtaining growth substrates exuded from the plant roots or released by disease-related breakdown of plant cells in the case of pathogenic interactions. The development of such interactions between Pseudomonas and host plants usually involves avoidance, subversion and sometimes even stimulation of the host plants defenses. In return the plant host can respond to the presence of the Pseudomonas sp. by modulating defense mechanisms, and engaging in signaling between itself and the infecting bacterium in an attempt to further promote beneficial interactions or suppress pathogenic ones. The molecular game of cat and mouse between the partners, with each attempting to benefit from the other, has evolved over millions of years and provides us now with a vast array of Pseudomonas-plant interaction mechanisms to unravel. Indeed, genetic and physiological similarities Pseudomonas. Model Organism, Pathogen, Cell Factory. Edited by Bernd H.A. Rehm

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“…lation dose (Normander and Hendriksen 2002). Could the production of bacteriocins and/or rhizobiocins by rhizobia in the soil be affecting the persistence of P. fluorescens in the soil?…”

Section: Inoculant Applicationsmentioning

confidence: 99%

Exploiting inter-organismal chemical communication for improved inoculants

Mabood¹,

Gray²,

Lee³

et al. 2006

Can. J. Plant Sci.

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[951][952][953][954][955][956][957][958][959][960][961][962][963][964][965][966]. The combination of rising fossil fuel prices and a need to reduce greenhouse gas emissions will lead to expanded use of crop inoculants (bio-fertilizers) both for increased production of biomass (for bio-fuels and soil C storage) and to reduce production of nitrous oxide, through increased reliance on biological nitrogen fixation. Over the last century inoculants have been improved through strain selection, improved carriers (including sterile carriers), and increased cell densities. During the last few decades our understanding of signalling between symbiotic bacteria and plants has expanded enormously, with the signalling between rhizobia and their legume hosts being the model system. Recent work has shown that adverse environmental conditions can inhibit this signalling and that addition of plant-to-microbe signals into inoculants can help overcome this. This is also true of addition of the microbe-to-plant signals that act as the return signals of this system; however, they have also been shown to cause a general and direct stimulation of plant growth that is not yet well understood. Finally, very recent work has shown that some of the plant growth-promoting rhizobacteria produce novel signal compounds that stimulate plant growth. This is a time of rapid increase in understanding with regard to plant-microbe signalling; the use of these signals in commercial inoculants offers a new wave in innovations for this industry at a time when there is great need.Key words: Inoculants, rhizobacteria, rhizobia, signalling Mabood, F., Gray, E. J., Lee, K. D., Supanjani, et Smith D. L. 2006. Exploitation de la médiation chimique entre les organismes pour créer de meilleurs inoculants. Can. J. Plant Sci. 86: 951-966. La hausse du prix des combustibles fossiles et la néces-sité de réduire les émissions de gaz à effet de serre déboucheront sur une utilisation accrue des inoculants en agriculture (engrais biologiques) pour la production d'une plus grande quantité de biomasse (pour les biocarburants et le stockage du carbone dans le sol) mais aussi pour la réduction des dégagements d'oxydes nitreux par un plus grand recours à des mécanismes biologiques pour fixer l'azote dans le sol. Au cours du siècle dernier, on a raffiné les inoculants par la sélection, amélioré les excipients (y compris les substrats stériles) et accru la population de cellules. Durant les quelque dernières décennies, nos connaissances sur les signaux que s'échangent microorganismes et végétaux en symbiose se sont considérablement élargies et le système de signalisation entre les rhizobiums et les légumineuses qui sont leur hôte est devenu un modèle du genre. Des recherches récentes indiquent que des conditions environnementales difficiles peuvent nuire à l'échange de signaux et qu'on peut surmonter ce problème en ajoutant des médiateurs plante-microorganisme à l'inoculant. La même remarque s'applique à l'addition de médiateurs microorganisme-plante qui véhiculent la répons...

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Effective dose of a microbial inoculant is one to four cells in the rhizosphere

Cited by 7 publications

References 12 publications

New Approaches for Bioaugmentation as a Remediation Technology

New Approaches for Bioaugmentation as a Remediation Technology

Pseudomonas–Plant Interactions

Exploiting inter-organismal chemical communication for improved inoculants

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