Publications Scientifiques

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Author: search.filters.author.Benzina, F.

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    Enhancing agriculture recovery of Phaseolus vulgaris L. and Cucurbita pepo L. with Olea europaea L. plant growth promoting rhizobacteria
    (CSIRO, 2022) Hadjouti, Rima; Mohand Kaci, H.; Benzina, F.; Furze, J.N.
    The rhizosphere is an environment created by interactions between root exudates and microorganisms. Interactions are beneficial due to certain components having a plant growth promoting rhizobacteria (PGPR) effect. Aims. This study consists of the isolation, screening of PGPR from the rhizosphere of Olea europaea L. of a Mediterranean climatic region in Algeria and the study of their effects on growth of two agronomic vegetables Phaseolus vulgaris L. and Cucurbita pepo L. Methods. Based on their ability to produce the PGPR molecules indole-3- acetic acid (IAA), phosphatase and siderophores, three rhizobacteria (S25, S75, and S79) were chosen for in vivo tests and capacity to produce the cell wall degrading enzymes chitinase, lipase, protease, glucanase, cellulase, and and phospholipase. They were also examined using scanning electron microscopy (SEM) and analysed using matrix-assisted laser desorption/ionisation time of flight mass spectrometry (MALDI-TOF MS) for identification. Key results. Bacterial strains identified as Bacillus cereus and Bacillus thuringiensis were able to enhance significantly germination of the two vegetables at P < 0.001. Vegetative parameters of C. pepo were significantly affected by the bacterial inoculation. We noted increases in stem length (P < 0.05), number of flowers (P < 0.01), and root length (P < 0.001). Conclusion. The bacterial isolates of this study provide biological options in treatments originating from alternate hosts. Implications. They provide hope for companion/intercrop planting schemes, leading to optimisation of agricultural yields in agroecological blends.
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    Isolation and Identification of Entomopathogenic Bacteria from Algerian Desert Soil and their Effects against the Migratory Locust, Locusta migratoria (Linnaeus, 1758) (Orthoptera: Acrididae)
    (EGYPTIAN SOC BIOLOGICAL CONTROL PESTS, 2015) Oulebsir-Mohandkaci, H.; Khemili-Talbi, S.; Benzina, F.; Halouane, F.
    After isolation and characterization of some bacteria in the rhizosphere soil of the Algerian desert plants, a total of 17 bacterial strains were isolated. They are mobile, aerobic, with a positive catalase. From these bacterial strains, four were selected for their entomopathogenic potential and identified based on their genetic traits. The rDNA16S sequences of these named strains (B3, B4, B5 and B6) were recorded in the EMBL/EBI data bank and their phylogenetic analysis revealed that they belong to the genera; Pseudomonas, Bacillus and Enterobacter. This study was highlighted on their entomopathogenic activity against the 5th instar larvae of the migratory locust, Locusta migratoria (Linnaeus, 1758) (Orthoptera: Acrididae). The results obtained, one week after treatment, showed that the treated nymphs were highly sensitive to the tested isolates of bacteria, with mortality rates of 100, 98, 71 and 65% for Pseudomonas sp. strain B3 (HF911369), Pseudomonas sp. strain B4 (HF911366) Enterobacter sp. strain B6 (HF911368) and Bacillus sp. strain B5 (HF911367), respectively, in comparison to the control (3.33%)