References of "Ongena, MARC"
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See detailThe role of surfactins in plant immunization by Bacilli
Cawoy, Hélène ULg; Henry, Guillaume ULg; Jourdan, Emmanuel ULg et al

Conference (2011, April)

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See detailBiological control of Rhizoctonia root rot on bean by phenazine and cyclic lipopeptide producing Pseudomonas CMR12a
D’aes, J.; Hoang Hua, G. K.; De Maeyer, K. et al

in Phytopathology (2011), 101

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See detailBeneficial effect of the rhizosphere microbial community for plant growth and health.
Nihorimbere, V.; Ongena, Marc ULg; Smargiassi, M. et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(2), 327-337

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See detailBacillus-based biological control of plant diseases
Cawoy, Hélène ULg; Bettiol, Wagner; Fickers, Patrick et al

in Stoytcheva, Margarita (Ed.) Pesticides in the Modern World - Pesticides Use and Management (2011)

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See detailThe elicitation of a systemic resistance by Pseudomonas putida BTP1 in tomato involves the stimulation of two lipoxygenase isoforms
Mariutto, Martin ULg; Duby, Franceline ULg; Adam, Akram et al

in BMC Plant Biology (2011), 11

Background Some non-pathogenic rhizobacteria called Plant Growth Promoting Rhizobacteria (PGPR) possess the capacity to induce in plant defense mechanisms effective against pathogens. Precedent studies ... [more ▼]

Background Some non-pathogenic rhizobacteria called Plant Growth Promoting Rhizobacteria (PGPR) possess the capacity to induce in plant defense mechanisms effective against pathogens. Precedent studies showed the ability of Pseudomonas putida BTP1 to induce PGPR-mediated resistance, termed ISR (Induced Systemic Resistance), in different plant species. Despite extensive works, molecular defense mechanisms involved in ISR are less well understood that in the case of pathogen induced systemic acquired resistance. Results We analyzed the activities of phenylalanine ammonia-lyase (PAL) and lipoxygenase (LOX), key enzymes of the phenylpropanoid and oxylipin pathways respectively, in tomato treated or not with P. putida BTP1. The bacterial treatment did not stimulate PAL activity and linoleate-consuming LOX activities. Linolenate-consuming LOX activity, on the contrary, was significantly stimulated in P. putida BTP1-inoculated plants before and two days after infection by B. cinerea. This stimulation is due to the increase of transcription level of two isoforms of LOX: TomLoxD and TomLoxF, a newly identified LOX gene. We showed that recombinant TomLOXF preferentially consumes linolenic acid and produces 13-derivative of fatty acids. After challenging with B. cinerea, the increase of transcription of these two LOX genes and higher linolenic acid-consuming LOX activity were associated with a more rapid accumulation of free 13-hydroperoxy-octadecatrienoic and 13-hydroxy-octadecatrienoic acids, two antifungal oxylipins, in bacterized plants. Conclusion In addition to the discovery of a new LOX gene in tomato, this work is the first to show differential induction of LOX isozymes and a more rapid accumulation of 13-hydroperoxy-octadecatrienoic and 13-hydroxy-octadecatrienoic acids in rhizobacteria mediated-induced systemic resistance. [less ▲]

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See detailThe lipoxygenase metabolic pathway in plants: potential for industrial production of natural green leaf volatiles
Gigot, Cédric ULg; Ongena, Marc ULg; Fauconnier, Marie-Laure ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(3), 451-460

Lipoxygenase enzymatic pathway is a widely studied mechanism in the plant kingdom. Combined actions of three enzymes: lipase, lipoxygenase (LOX) and hydroperoxide lyase (HPL) convert lipidic substrates ... [more ▼]

Lipoxygenase enzymatic pathway is a widely studied mechanism in the plant kingdom. Combined actions of three enzymes: lipase, lipoxygenase (LOX) and hydroperoxide lyase (HPL) convert lipidic substrates such as C18:2 and C18:3 fatty acids into short chain volatiles. These reactions, triggered by cell membrane disruptions, produce compounds known as Green Leaf Volatiles (GLVs) which are C6 or C9-aldehydes and alcohols. These GLVs are commonly used as flavors to confer a fresh green odor of vegetable to food products. Therefore, competitive biocatalytic productions have been developed to meet the high demand in these natural flavors. Vegetable oils, chosen for their lipidic acid profile, are converted by soybean LOX and plant HPL into natural GLVs. However this second step of the bioconversion presents low yield due to the HPL instability and the inhibition by its substrate. This paper will shortly describe the different enzymes involved in this bioconversion with regards to their chemical and enzymatic properties. Biotechnological techniques to enhance their production potentialities will be discussed along with their implication in a complete bioprocess, from the lipid substrate to the corresponding aldehydic or alcoholic flavors. [less ▲]

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See detailIdentification, characterization and expression profiling of the tomato gene TomLoxF
Mariutto, Martin ULg; Duby, Franceline ULg; Adam, Akram et al

Poster (2010, January 26)

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See detailDevelopment of a biotransformation process of hydroperoxides into green leaf volatiles using sugar beet leaves
Gigot, C.; Ongena, Marc ULg; Fauconnier, Marie-Laure ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010)

Natural green leaf volatiles (GLVs) are commonly sole AS aldehydic and alcoholic flavors; their synthesis is a great challenge for industry. Especially, the bioconversion step of fatty acid hydroperoxides ... [more ▼]

Natural green leaf volatiles (GLVs) are commonly sole AS aldehydic and alcoholic flavors; their synthesis is a great challenge for industry. Especially, the bioconversion step of fatty acid hydroperoxides into aldehydes by the hydroperoxide lyase (HL). This widely studied enzyme is present in cell membranes of green organs from superior plants. Extracted from its natural condition, HL is subject to a suicidal behavior, being irreversibly inhibited by its own substrate. Furthermore, GLVs produced are highly volatile and quickly degraded by other plant enzymes. Thence, high GLVs levels in industrial production are very difficult to obtain, but several biotechnological tools could be developed to enhance this natural synthesis level more than hundred times. This paper will describe a new method for GLVs production in bioreactor using sugar beet leaves as source of HL. One step reaction, including hydroperoxide metabolisation and GLVs extraction, is performed during a short time process. Downstream processing to dispose of natural and pure GLVs molecule will also be discussed. [less ▲]

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See detailModulation of the lipopeptide pattern secreted by Bacillus subtilis upon colonization of different plant roots
Ongena, Marc ULg; Cawoy, H.; Margiassi, M. et al

Conference (2010)

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See detailDifferential roles of lipopeptides(LPs) in plant host defenses and pathogen suppression.
Ongena, Marc ULg; Henry, G.; Jourdan, E. et al

Conference (2010)

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See detailUnraveling the roles of lipopeptides on ISR
Ongena, Marc ULg; Jourdan, E.; Henry, G. et al

Conference (2010)

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See detailDevelopment of a biotransformation process of hydroperoxydes into green leaf volatiles using sugar beet leaves.
Gigot, C.; Ongena, Marc ULg; Fauconnier, Marie-Laure ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14 (S2)

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See detailInsights into the plant defense mechanisms induced by Bacillus lipopeptides
Ongena, Marc ULg; Henry, G.; Adam, A. et al

in Biology of Plant-Microbe Interactions (2010)

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See detailDifferential roles of lipopeptides in plant host defenses and pathogen suppression.
Ongena, Marc ULg; Henry, G.; Jourdan, Emmanuel ULg et al

in Phytopathology (2010), 100

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See detailNatural functions of cyclic lipopeptides from Bacillus and Pseudomonas: more than surfactants and antibiotics
Raaijmakers, Jos; De Bruin, Irene; Nybroe, Ole et al

in FEMS Microbiology Reviews (2010), 34

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See detailBeneficial effects of Bacillus subtilis on field-grown tomato in Burundi : reduction of local Fusarium disease and growth promotion.
Nihorimbere, V.; Ongena, Marc ULg; Cawoy, Hélène ULg et al

in African Journal of Microbiology Research [=AJMR] (2010), 4

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See detailProduction of three anti-listerial peptides by Lactobacillus curvatus in MRS broth.
Ghalfi, H.; Benkerroum, N.; Ongena, Marc ULg et al

in Food Research International (2010), (43), 33-39

Detailed reference viewed: 13 (5 ULg)