References of "Jijakli, Haissam"
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See detailViruses of cucurbit crops: current status in the Mediterranean Region
Radouane, Nabil; Ezrari, Said; Belabess, Zineb et al

in Phytopathologia Mediterranea (2021), 60(3), 493-519

Cucurbits are among the most cultivated crops, and the most economically important species are melon (Cucumis melo L.), cucumber (Cucumis sativus L.), watermelon (Citrullus lanatus Thumb.), squash ... [more ▼]

Cucurbits are among the most cultivated crops, and the most economically important species are melon (Cucumis melo L.), cucumber (Cucumis sativus L.), watermelon (Citrullus lanatus Thumb.), squash (Cucurbita pepo L.), and pumpkin (Cucurbita spp.). These crops have become important income sources providing export and local consumption commodities in many Mediterranean countries. Increased area of cucurbits has led to the emergence of several viral diseases, which can have impacts on crop production and threaten agricultural sustainability. An overview of the most damaging cucurbit viruses in the Mediterranean area is provided to improve understanding of the diseases they cause and to emphasize effective disease management strategies. An updating of the geographical distribution of these viruses, the symptoms they cause and their means of transmission is also provided. Disease management methods and measures by farmers and phytosanitary authorities to address the virus outbreaks are outlined, including diagnostics, use of tolerant cultivars, and chemical and biological vector control. Mediterranean region farmers have learned many lessons from the damaging pandemics caused by cucurbit viruses, through the extensive published research, and this review provides a basis for managing future outbreaks of newly emerging virus infections. [less ▲]

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See detailPotential for the use of lactoperoxidase against postharvest diseases on fruit
Bafort, Françoise ULiege; Perraudin, Jean-Paul; Jijakli, Haissam ULiege

in Acta Horticulturae (2021), 1323

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See detailUse of Essential Oils and Volatile Compounds as Biological Control Agents
De Clerck, Caroline ULiege; Genva, Manon ULiege; Jijakli, Haissam ULiege et al

in Foods (2021)

Plants containing essential oils have been used for centuries as spices, remedies or for their pleasant odour. In the Middle Ages, the development of distillation tech-niques made it possible to obtain ... [more ▼]

Plants containing essential oils have been used for centuries as spices, remedies or for their pleasant odour. In the Middle Ages, the development of distillation tech-niques made it possible to obtain essential oils, which have continued to be used in their historical applications in food, medicine or cosmetics. However, over the last few decades, the essential oil sector has entered a new dimension as its fields of appli-cation are constantly [less ▲]

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See detailMicrobial ecology to support integrative efficacy improvement of biocontrol agents for postharvest diseases management
Sare, Abdoul Razack ULiege; Jijakli, Haissam ULiege; Massart, Sébastien ULiege

in Postharvest Biology and Technology (2021), 179

Harvested fruits and vegetables are threatened by pathogens which can cause losses for up to 55 % depending on the fruit and country. A potentially sustainable control method is the biological control of ... [more ▼]

Harvested fruits and vegetables are threatened by pathogens which can cause losses for up to 55 % depending on the fruit and country. A potentially sustainable control method is the biological control of these postharvest diseases using biocontrol agents (BCA). Nevertheless, the lack of reliability in practical conditions compared with synthetic chemical pesticides is a major hinderance. Strategies combining BCA application to nutrient additives, salts, edible coatings, or physical treatments have been evaluated to improve BCA antagonism activity, but with only relative success. The fruit surface is colonized by complex microbial communities that are often resilient. In a such environment, BCA establishment might be difficult. The integration of the role of microbial communities to assemble a BCA-friendly microbiota, is a promising solution to manage the reliability of BCA in real condition. Biocontrol phenotype of a microbiota is a complex metabolic phenotype that can be broken down in a multiple process supported by a network of beneficial microorganisms and molecules. Combining BCA application in a suitable complex biocontrol mix including for example beneficial helper strains, essential macro and micronutrients also acting as prebiotic of biocontrol could help the establishment of BCA in the epiphytic microbial network. At the same time, it could achieve a biocontrol efficacy and reliability comparable to synthetic chemical pesticides. In addition, the timing of beneficial microbial application has been reviewed based on the available literature. For example, we propose that shifting application at flowering stage (to induce a “path dependency”) could be considered for the future management of postharvest disease of fruits and vegetables. This application moment shift could be extended to other plant organ like seeds. [less ▲]

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See detailProduction of rainbow trout (Oncorhynchus mykiss) using black soldier fly (Hermetia illucens) prepupae-based formulations with differentiated fatty acid profiles
Hoc, Bertrand ULiege; Tomson, Thomas ULiege; Malumba Kamba, Paul ULiege et al

in Science of the Total Environment (2021), 794

The aquaculture sector is expanding rapidly and needs an increasing supply of fishery products. To ensure an ecological transition of this sector, alternative feed ingredients are required for fish ... [more ▼]

The aquaculture sector is expanding rapidly and needs an increasing supply of fishery products. To ensure an ecological transition of this sector, alternative feed ingredients are required for fish nutrition. Potential alternatives include insects, particularly the black soldier fly (BSF, Hermetia illucens L. 1758), which is being increasingly targeted for their nutritional qualities and their sustainable production practices. BSF have a well-balanced amino acid profile; however, their fatty acid profile is not sufficiently balanced for most aquafeed formulations but can be modulated through their feed. In this study, two different batches of BSF prepupae (BSFP) were firstly produced: BSFP with a standard ω3 content (C18:3n-3 ≈ 1.36%) and ω3-enriched BSFP (C18:3n-3 ≈ 9.67%). Then, three isoproteic, -lipidic and -energetic trout feeds were formulated and produced: one control and two feeds containing 75% BSF meal as a substitute for fish meal (standard vs ω3-enriched-BSF). Finally, a trout feeding trial (n = 3 for each feed batch) in a recirculating aquaculture system was carried out for 75 days. BSFP meal inclusion in trout diets did not impact most nutritional and growth parameters of trout compared to the control; however, the coefficient of fatness increased, weight gain decreased and fatty acid profiles of fillets were altered. In conclusion, this study presents a more sustainable model of trout production by including insects from bioconversion of local byproducts in aquafeed. © 2021 Elsevier B.V. [less ▲]

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See detailCONSTRUCTION D’UNE SERRE EN TOITURE RETOUR D’EXPÉRIENCE DE QUATRE PROJETS PILOTES GROOF
Ancion, Nicolas ULiege; Jijakli, Haissam ULiege; Crutzen, Nathalie ULiege et al

Report (2021)

Il y a 4 ans, les premiers projets de serre en toiture germaient à travers l’Europe. Le consortium GROOF, composé d’une équipe pluridisciplinaire, fut créé pour participer au développement de ce secteur ... [more ▼]

Il y a 4 ans, les premiers projets de serre en toiture germaient à travers l’Europe. Le consortium GROOF, composé d’une équipe pluridisciplinaire, fut créé pour participer au développement de ce secteur porteur. Comme toute innovation, elle ne va pas sans son lot d’embuches. C’est pourquoi 4 projets pilotes de serres en toitures furent développés par quatre partenaires GROOF : • IFSB : Bettembourg (Luxembourg) • EBF : Bürstadt (Allemagne) • Université de Liège : Gembloux (Belgique) • Jardins de Gally : Saint-Denis (Paris-France) L’année 2021 marque l’achèvement des travaux de construction de ces serres pilotes et le début de leur exploitation. Forts de cette expérience, nous mettrons en lumière dans cet article les différents challenges rencontrés et les solutions qui en découlent. Les challenges sont rencontrés lors des 3 étapes principales du projet : • Avant la construction • Pendant la construction • Les défis futurs/attendus [less ▲]

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See detailVolatile Organic Compounds Emitted by Aspergillus flavus Strains Producing or Not Aflatoxin B1
Josselin, Laurie ULiege; De Clerck, Caroline ULiege; De Boever Marthe et al

in Toxins (2021)

Aspergillus flavus is a phytopathogenic fungus able to produce aflatoxin B1 (AFB1), a carcinogenic mycotoxin that can contaminate several crops and food commodities. In A. flavus, two different kinds of ... [more ▼]

Aspergillus flavus is a phytopathogenic fungus able to produce aflatoxin B1 (AFB1), a carcinogenic mycotoxin that can contaminate several crops and food commodities. In A. flavus, two different kinds of strains can co-exist: toxigenic and non-toxigenic strains. Microbial-derived volatile organic compounds (mVOCs) emitted by toxigenic and non-toxigenic strains of A. flavus were analyzed by solid phase microextraction (SPME) coupled with gas chromatography–mass spectrometry (GC-MS) in a time-lapse experiment after inoculation. Among the 84 mVOCs emitted, 44 were previously listed in the scientific literature as specific to A. flavus, namely alcohols (2-methylbutan1-ol, 3-methylbutan-1-ol, 2-methylpropan-1-ol), aldehydes (2-methylbutanal, 3-methylbutanal), hydrocarbons (toluene, styrene), furans (2,5-dimethylfuran), esters (ethyl 2-methylpropanoate, ethyl 2-methylbutyrate), and terpenes (epizonaren, trans-caryophyllene, valencene, α-copaene, β-himachalene, γ-cadinene, γ-muurolene, δ-cadinene). For the first time, other identified volatile compounds such as α-cadinol, cis-muurola-3,5-diene, α-isocomene, and β-selinene were identified as new mVOCs specific to the toxigenic A. flavus strain. Partial Least Square Analysis (PLSDA) showed a distinct pattern between mVOCs emitted by toxigenic and non-toxigenic A. flavus strains, mostly linked to the diversity of terpenes emitted by the toxigenic strains. In addition, the comparison between mVOCs of the toxigenic strain and its non-AFB1-producing mutant, coupled with a semiquantification of the mVOCs, revealed a relationship between emitted terpenes (β-chamigrene, αcorocalene) and AFB1 production. This study provides evidence for the first time of mVOCs being linked to the toxigenic character of A. flavus strains, as well as terpenes being able to be correlated to the production of AFB1 due to the study of the mutant. This study could lead to the development of new techniques for the early detection and identification of toxigenic fungi. [less ▲]

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See detailIntegrated model of insect, fish and vegetable production
Hoc, Bertrand ULiege; Tomson, Thomas ULiege; Caparros Megido, Rudy ULiege et al

Poster (2020, December 12)

Global demand for food grow while resources including feed, water and spaces are limited To supply this demand in a context of sustainable development, new production models must be developed Integrated ... [more ▼]

Global demand for food grow while resources including feed, water and spaces are limited To supply this demand in a context of sustainable development, new production models must be developed Integrated productions of insects, fishes and vegetables maximize the use of resources and limit waste production The developed model allows local production of fishes and vegetables by insect bioconversion of many organic vegetable materials with small or no value [less ▲]

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See detailMicrobial Origin of Aquaponic Water Suppressiveness against Pythium aphanidermatum Lettuce Root Rot Disease
Stouvenakers, Gilles ULiege; Massart, Sébastien ULiege; Depireux, Pierre et al

in Microorganisms (2020), 8(11), 24

Aquaponic systems are an integrated way to produce fish and plants together with mutual benefices. In this kind of system, the use of phytosanitary treatments to control plant pathogens is sensitive. The ... [more ▼]

Aquaponic systems are an integrated way to produce fish and plants together with mutual benefices. In this kind of system, the use of phytosanitary treatments to control plant pathogens is sensitive. The reason is the risk of toxicity for fish present in the same water loop especially in case of a couple aquaponics. Among plant pathogens, Pythium aphanidermatum is problematics due to the Oomycetes capacity to produce mobile form of dispersion in the recirculated water. However, this study has for aim to elucidate the potential antagonistic capacity of aquaponic water against P. aphanidermatum diseases. It was shown that aquaponic water owned an inhibitory effect of P. aphanidermatum mycelial growth in in vitro conditions. The same result was shown when lettuces growing in aquaponic water were inoculated by the pseudo-fungus. The disease was thus suppressed in presence of aquaponic water, contrary to lettuces grown in hydroponic water or complemented aquaponic water (aquaponic water plus mineral nutrients). Root microbiota were analysed by 16S rDNA and ITS Illumina sequencing to determine the origin of this aquaponic suppressive action. It was determined that diversity and composition of the root microbiota was significantly correlated with the suppressive effect of AP water. Several taxa were identified to be involved in this effect. Moreover, few of these microorganisms, at the genus level, were known to have an antagonistic effect against P. aphanidermatum. These innovating results indicated that AP water could be an interesting and novel source of antagonistic agents adapted to control P. aphanidermatum diseases in soilless culture. [less ▲]

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See detailCitrus Psorosis Virus: Current Insights on a Still Poorly Understood Ophiovirus
Belabess, Zineb; Sagouti, Tourya; Rhallabi, Naima et al

in Microorganisms (2020), 8(8),

Citrus psorosis was reported for the first time in Florida in 1896 and was confirmed as a graft-transmissible disease in 1934. Citrus psorosis virus (CPsV) is the presumed causal agent of this disease. It ... [more ▼]

Citrus psorosis was reported for the first time in Florida in 1896 and was confirmed as a graft-transmissible disease in 1934. Citrus psorosis virus (CPsV) is the presumed causal agent of this disease. It is considered as a type species of the genus Ophiovirus, within the family Aspiviridae. CPsV genome is a negative single-stranded RNA (-ssRNA) with three segments. It has a coat protein (CP) of 48 kDa and its particles are non-enveloped with naked filamentous nucleocapsids existing as either circular open structures or collapsed pseudo-linear forms. Numerous rapid and sensitive immuno-enzymatic and molecular-based detection methods specific to CPsV are available. CPsV occurrence in key citrus growing regions across the world has been spurred the establishment of the earliest eradication and virus-free budwood programs. Despite these efforts, CPsV remains a common and serious challenge in several countries and causes a range of symptoms depending on the isolate, the cultivar, and the environment. CPsV can be transmitted mechanically to some herbaceous hosts and back to citrus. Although CPsV was confirmed to be seedborne, the seed transmission is not efficient. CPsV natural spread has been increasing based on both CPsV surveys detection and specific CPsV symptoms monitoring. However, trials to ensure its transmission by a soil-inhabiting fungus and one aphid species have been unsuccessful. Psorosis disease control is achieved using CPsV-free buds for new plantations, launching budwood certification and indexing programs, and establishing a quarantine system for the introduction of new varieties. The use of natural resistance to control CPsV is very challenging. Transgenic resistance to at least some CPsV isolates is now possible in at least some sweet orange varieties and constitutes a promising biotechnological alternative to control CPsV. This paper provides an overview of the most remarkable achievements in CPsV research that could improve the understanding of the disease and lead the development of better control strategies [less ▲]

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See detailFace au réchauffement climatique, l'agriculture doit se réinventer
Degré, Aurore ULiege; Bodson, Bernard ULiege; Jijakli, Haissam ULiege et al

Article for general public (2020)

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See detailStandardization of Plant Microbiome Studies: Which Proportion of the Microbiota is Really Harvested?
Sare, Abdoul Razack ULiege; Stouvenakers, Gilles ULiege; Eck, Mathilde ULiege et al

in Microorganisms (2020), 8(3), 342

Studies in plant-microbiome currently use diverse protocols, making their comparison difficult and biased. Research in human microbiome have faced similar challenges, but the scientific community proposed ... [more ▼]

Studies in plant-microbiome currently use diverse protocols, making their comparison difficult and biased. Research in human microbiome have faced similar challenges, but the scientific community proposed various recommendations which could also be applied to phytobiome studies. Here, we addressed the isolation of plant microbiota through apple carposphere and lettuce root microbiome. We demonstrated that the fraction of the culturable epiphytic microbiota harvested by a single wash might only represent one-third of the residing microbiota harvested after four successive washes. In addition, we observed important variability between the efficiency of washing protocols (up to 1.6-fold difference for apple and 1.9 for lettuce). QIIME2 analysis of 16S rRNA gene, showed a significant difference of the alpha and beta diversity between protocols in both cases. The abundance of 76 taxa was significantly different between protocols used for apple. In both cases, differences between protocols disappeared when sequences of the four washes were pooled. Hence, pooling the four successive washes increased the alpha diversity for apple in comparison to a single wash. These results underline the interest of repeated washing to leverage abundance of microbial cells harvested from plant epiphytic microbiota whatever the washing protocols, thus minimizing bias. [less ▲]

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See detailIdentification and management of vanilla diseases in Madagascar
Raveloson, Lanto ULiege; El Jaziri, Mondher; De Clerck, Caroline ULiege et al

Poster (2020, January 31)

About 97% of the real vanilla come from Madagascar worldwide. Madagascar’s vanilla is well known for its quality, and its production is very important for the country’s economy. However this culture is ... [more ▼]

About 97% of the real vanilla come from Madagascar worldwide. Madagascar’s vanilla is well known for its quality, and its production is very important for the country’s economy. However this culture is threatened by the emergence of fungal and viral diseases that have been recorded for a decade, causing significant devaluations of the production’s level of quality and an important reduction of the quantities annually exported. In order to be able to scientifically construct a strategy of prevention and control against the main pathogens of vanilla, large sampling campaign was carried out in Madagascar’s SAVA region. Lianas showing symptoms of cryptogamic diseases such as rot, wilt, necrosis or melanosis were harvested. 75 bacteria and 61 fungi were isolated on NA and PDA medium and identified. Morphological and molecular identifications (based on the sequencing of 16S rRNA and ITS regions) of these isolates have shown that the genus Fusarium is the most present (27% of fungal isolates) and is represented by species of F. oxysporum, F. proliferatum, F. concentricum, F. equiseti, F. pseudocircinatum and F. mangiferae. While for bacteria, the genus Bacillus predominates (44% of purified bacterial strains). Many bacteria of the genus Bacillus are known for their biocontrol properties; this is why we have tested the potential antagonistic effect of all vanilla-isolated Bacillus strains against two species of Fusarium. Nine Bacillus strains were identified for reducing the growth of the fungi, and are of great potential for the development of a biocontrol strategy against Fusarium attacking vanilla in Madagascar. [less ▲]

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See detailAquaponic water, a novel source of biocontrol agents against pythium aphanidermatum root rot in lettuce
Stouvenakers, Gilles ULiege; Massart, Sébastien ULiege; Jijakli, Haissam ULiege

Poster (2020, January 31)

In aquaponics, phytosanitary treatments for plant diseases management are a delicate matter because of the presence of fish. However, it appears that aquaponic systems could be naturally armed against ... [more ▼]

In aquaponics, phytosanitary treatments for plant diseases management are a delicate matter because of the presence of fish. However, it appears that aquaponic systems could be naturally armed against plant pathogens. This natural protective action is called suppressiveness. Aquaponic water has shown a direct inhibitory effect on in vitro Pythium spp. growth (Gravel et al. 2015; Sirakov et al. 2016; Stouvenakers et al. 2018). To confirm this discovery, in vivo experiments using Pythium aphanidermatum have been carried out on lettuces growing in hydroponic (HP) water, aquaponic (AP) water or aquaponic water complemented (COMP) with mineral nutrients to reach HP levels. Suppressiveness property of AP, COMP and HP waters was evaluated by comparing root symptoms and lettuces yields. For each treatments, lettuces root microbiota were analysed after Illumina high throughput sequencing of ITS and 16S rDNA genes. Results showed that yields and roots health of AP lettuces were significantly better compared to COMP and HP lettuces. The bioinformatics analysis of sequenced microbiota showed differences in terms of microbiota diversity and features composition when comparing AP with COMP and HP water. These results highlight that the physicochemical modifications of the AP water to make the COMP water disturb the AP microbiota and lead to the loss of its suppressive capacity. Moreover, AP could be an interesting source of novel biocontrol agents for plant pathogens control in aquaponics. [less ▲]

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See detailCynara cardunculus crude extract as a powerful natural herbicide and insight into the mode of action of its bioactive molecules
Ben Kaab, Sofiène ULiege; Lins, Laurence ULiege; Hanafi, Marwa ULiege et al

in Biomolecules (2020), 10(2), 209

The use of chemical herbicides could not only potentially induce negative impacts on the environment, animals, and human health, but also increase the weed resistance to herbicides. In this context, the ... [more ▼]

The use of chemical herbicides could not only potentially induce negative impacts on the environment, animals, and human health, but also increase the weed resistance to herbicides. In this context, the use of plant extracts could be an interesting and natural alternative to chemical products. It is important to understand the mode of action of their bioactive compounds. This is why we have studied the herbicidal effect of Cynara cardunculus crude extract in terms of inhibition of weeds’ seedling growth and its impact on physiological parameters of treated plantlets, like conductivity, dry weight, and fluorescence, and biochemical parameters linked to oxidative stress. We have observed that C. cardunculus crude extract induces oxidative stress in the treated plants and consequently disturbs the physiological and biochemical functions of the plant cells. We have investigated the herbicidal activity of three bioactive compounds, naringenin, myricitrin, and quercetin, from the C. cardunculus crude extract. In both pre- and post-emergence trials, naringenin and myricitrin were significantly more phytotoxic than quercetin. We suggest that their differential initial interaction with the plant’s plasma membrane could be one of the main signals for electrolyte leakage and production of high levels of phenoxyl radicals. [less ▲]

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