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

in Acta Horticulturae (in press)

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

in Microorganisms (2020), 8

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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 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 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 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)

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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See detailEfficacité des Composés Organiques Volatils fongiques (synthèse bibliographique)
Kaddes, Amine ULiege; Fauconnier, Marie-Laure ULiege; Sassi, Khaled et al

in Biotechnologie, Agronomie, Société et Environnement (2020), 24

Introduction. Excessive use of chemical fungicides continues to drive research towards environmentally friendly and innovative alternatives for crop protection. Literature. Fungi produce various mixtures ... [more ▼]

Introduction. Excessive use of chemical fungicides continues to drive research towards environmentally friendly and innovative alternatives for crop protection. Literature. Fungi produce various mixtures of compounds in the gas phase, called Volatile Organic Compounds (VOCs). They are able to diffuse into the soil and into the atmosphere and inhibit the activities of fungal pathogens. In this section, we will summarize recent knowledge on the inhibitory potential of Volatile Organic Compounds against pathogenic fungi with a focus on the effect of fungal VOCs. In practice, we will unveil initial research revealing their mode of action and any non-specific phytotoxic effects on the environmental microbiome and on plants. Conclusions. This article discusses new techniques used by researchers that focus on mycofumigation to optimize the formulation of a new generation of biofungicides. Thus, a new horizon is emerging for biological control of crop diseases. [less ▲]

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See detailScreening of Tunisian plant extracts for herbicidal activity and formulation of a bioherbicide based on Cynara cardunculus
Ben Kaab, Sofiène ULiege; Bettaieb, Iness ULiege; Hanafi, Marwa ULiege et al

in South African Journal of Botany (2020)

The need to reduce the use of chemical pesticides currently fosters great interest in eco-friendly biological control agents. In addition, the isolation of plant allelopathic substances and the evaluation ... [more ▼]

The need to reduce the use of chemical pesticides currently fosters great interest in eco-friendly biological control agents. In addition, the isolation of plant allelopathic substances and the evaluation of their phytotoxic effects can lead to the discovery of new natural herbicides. In this context, our study aimed to assess the herbicidal activity of ten crude extracts obtained from aerial parts of Tunisian spontaneous plants against Trifolium incarnatum, Silybum marianum and Phalaris minor. It confirmed that the Cynara cardunculus methanolic extract best inhibited weed germination and seedling growth, and caused necrosis or chlorosis. Following a bioassay-guided fractionation, five main phenolic compounds, (1) syringic acid, (2) p-coumaric acid, (3) myricitrin, (4) quercetin and (5) naringenin were identified in the most active crude methanolic extract. Then, only 3 of the flavonoids contained in the most active fraction were tested on Trifolium incarnatum. The 3 compounds had a significant phytotoxic effect and therefore could be employed in a new composition of botanical herbicides to control crop weeds. Besides, a novel herbicide composition was designed to improve the post-emergence activity of the methanolic extract. The formulation containing the C. cardunculus crude methanolic extract showed the same herbicidal activity as the standard industrial bioherbicide containing pelargonic acid. These results make C. cardunculus a suitable source of natural compounds potentially usable as natural herbicides. [less ▲]

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See detailCharacterization of Aureobasidium pullulans Isolates Selected as Biocontrol Agents Against Fruit Decay Pathogens
Zajc, Janja; Cernosa, Anja; Di Francesco, Alessandra et al

in Fungal Genomics and Biology (2020), 10(163),

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See detailAgriculture Urbaine: Gembloux Agro-Bio Tech dédie 5 ha de son campus
Jijakli, Haissam ULiege

Article for general public (2019)

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See detailAgriculture urbaine : les leçons de la faillite d’Urban Farmers à La Haye
Ancion, Nicolas ULiege; Crutzen, Nathalie ULiege; Jijakli, Haissam ULiege

Article for general public (2019)

https://theconversation.com/agriculture-urbaine-les-lecons-de-la-faillite-durban-farmers-a-la-haye-126885 Juillet 2018 : UF002 De Schilde, l’une des plus grandes serres en toiture d’Europe, située à La ... [more ▼]

https://theconversation.com/agriculture-urbaine-les-lecons-de-la-faillite-durban-farmers-a-la-haye-126885 Juillet 2018 : UF002 De Schilde, l’une des plus grandes serres en toiture d’Europe, située à La Haye (Hollande), déclare faillite. Initié en 2016, ce projet était porté par Urban Farmers, une entreprise suisse pionnière dans le domaine de l’agriculture urbaine.En nous appuyant sur des documents disponibles et des interviews réalisées dans le cadre du projet Interreg NWE GROOF, nous avons découvert que la stratégie, la mésentente entre des actionnaires ainsi que des problèmes techniques de production, rendaient compte de cet échec. [less ▲]

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