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Mahmoud Kitouni
Laboratoire de Génie Microbiologie et Applications, Université des Frères Mentouri Constantine 1, Route Ain El Bey, 25000 Constantine, Algeria

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Journal article
Published: 23 June 2021 in Environmental Research
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This study underlines the biotechnical valorization of the accumulated and unusable remains of agro-industrial orange fruit peel waste to produce α-amylase under submerged conditions by Streptomyces sp. KP314280 (20r). The response surface methodology based on central composite design (RSM-CCD) and artificial neural network coupled with a genetic algorithm (ANN-GA) were used to model and optimize the conditions for the α-amylase production. Four independent variables were evaluated for α-amylase activity including substrate concentration, inoculum size, sodium chloride powder (NaCl), and pH. A ten-fold cross-validation indicated that the ANN has a greater ability than the RSM to predict the α-amylase activity (R2ANN = 0.884 and R2RSM = 0.725). The analysis of variance indicated that the aforementioned four factors significantly affected the α-amylase activity. Additionally, the α-amylase production experiments were conducted according to the optimal conditions generated by the GA. The results indicated that the amylase yield increased by 4-fold. Moreover, the α-amylase production (12.19 U/mL) in the optimized medium was compatible with the predicted conditions outlined by the ANN-GA model (12.62 U/mL). As such, the ANN and GA combination is optimizable for α-amylase production and exhibits an accurate prediction which provides an alternative to other biological applications.

ACS Style

Mouna Imene Ousaadi; Fateh Merouane; Mohammed Berkani; Fares Almomani; Yasser Vasseghian; Mahmoud Kitouni. Valorization and optimization of agro-industrial orange waste for the production of enzyme by halophilic Streptomyces sp. Environmental Research 2021, 201, 111494 .

AMA Style

Mouna Imene Ousaadi, Fateh Merouane, Mohammed Berkani, Fares Almomani, Yasser Vasseghian, Mahmoud Kitouni. Valorization and optimization of agro-industrial orange waste for the production of enzyme by halophilic Streptomyces sp. Environmental Research. 2021; 201 ():111494.

Chicago/Turabian Style

Mouna Imene Ousaadi; Fateh Merouane; Mohammed Berkani; Fares Almomani; Yasser Vasseghian; Mahmoud Kitouni. 2021. "Valorization and optimization of agro-industrial orange waste for the production of enzyme by halophilic Streptomyces sp." Environmental Research 201, no. : 111494.

Journal article
Published: 10 April 2021 in Soil Systems
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This study aimed to characterize the halotolerant capability, in vitro, of selected actinomycetes strains and to evaluate their competence in promoting halo stress tolerance in durum wheat in a greenhouse experiment. Fourteen isolates were tested for phosphate solubilization, indole acetic acid, hydrocyanic acid, and ammonia production under different salt concentrations (i.e., 0, 0.25, 0.5, 0.75, 1, 1.25, and 1.5 M NaCl). The presence of 1-aminocyclopropane-1-carboxylate deaminase activity was also investigated. Salinity tolerance was evaluated in durum wheat through plant growth and development parameters: shoot and root length, dry and ash-free dry weight, and the total chlorophyll content, as well as proline accumulation. In vitro assays have shown that the strains can solubilize inorganic phosphate and produce indole acetic acid, hydrocyanic acid, and ammonia under different salt concentrations. Most of the strains (86%) had 1-aminocyclopropane-1-carboxylate deaminase activity, with significant amounts of α-ketobutyric acid. In the greenhouse experiment, inoculation with actinomycetes strains improved the morpho-biochemical parameters of durum wheat plants, which also recorded significantly higher content of chlorophylls and proline than those uninoculated, both under normal and stressed conditions. Our results suggest that inoculation of halotolerant actinomycetes can mitigate the negative effects of salt stress and allow normal growth and development of durum wheat plants.

ACS Style

Rihab Djebaili; Marika Pellegrini; Massimiliano Rossi; Cinzia Forni; Maria Smati; Maddalena Del Gallo; Mahmoud Kitouni. Characterization of Plant Growth-Promoting Traits and Inoculation Effects on Triticum durum of Actinomycetes Isolates under Salt Stress Conditions. Soil Systems 2021, 5, 26 .

AMA Style

Rihab Djebaili, Marika Pellegrini, Massimiliano Rossi, Cinzia Forni, Maria Smati, Maddalena Del Gallo, Mahmoud Kitouni. Characterization of Plant Growth-Promoting Traits and Inoculation Effects on Triticum durum of Actinomycetes Isolates under Salt Stress Conditions. Soil Systems. 2021; 5 (2):26.

Chicago/Turabian Style

Rihab Djebaili; Marika Pellegrini; Massimiliano Rossi; Cinzia Forni; Maria Smati; Maddalena Del Gallo; Mahmoud Kitouni. 2021. "Characterization of Plant Growth-Promoting Traits and Inoculation Effects on Triticum durum of Actinomycetes Isolates under Salt Stress Conditions." Soil Systems 5, no. 2: 26.

Review
Published: 11 February 2021 in Journal of Plant Nutrition
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The impact of stress on crop productivity and the ecosystem have been magnified by climate changes and mispractices in the agriculture field. Soil microbiome is a diverse system consisting of various microorganisms. Environmental control techniques like the use of arbuscular mycorrhizal fungi (AMF) are necessary to enhance crop productivity. AMF is known as stress regulating organisms that help plants within the nutrient uptake, biotic and abiotic stress management, plant protection, and consequently enhancement on crop yields. Also, host plants can tolerate many difficult situations such as water problems, salt stress, heavy metals, and temperature changes through AMF inoculation. Arbuscular mycorrhizae (AM) enhance plant growth under stress by mediating a series of complex contact events between the two symbiotic partners resulting in a good photosynthetic and gas exchange amelioration. Plants have several tolerance mechanisms to deal with the constraints of environmental changes. The antioxidant ability is the principal tolerance mechanism; it is assisted by osmolytes accumulation and exacting absorption of ions. In this review, we will discuss the effect of AMF colonization on the host plants at different stages of growth, with comprehensively updated knowledge, their roles, and applications for plant growth enhancement and mycorrhizae role on plant resistance induction and stress management.

ACS Style

Debasis Mitra; Rihab Djebaili; Marika Pellegrini; Bhaswatimayee Mahakur; Aniruddha Sarker; Priya Chaudhary; Bahman Khoshru; Maddalena Del Gallo; Mahmoud Kitouni; Durga P. Barik; Periyasamy Panneerselvam; Pradeep K. Das Mohapatra. Arbuscular mycorrhizal symbiosis: plant growth improvement and induction of resistance under stressful conditions. Journal of Plant Nutrition 2021, 44, 1993 -2028.

AMA Style

Debasis Mitra, Rihab Djebaili, Marika Pellegrini, Bhaswatimayee Mahakur, Aniruddha Sarker, Priya Chaudhary, Bahman Khoshru, Maddalena Del Gallo, Mahmoud Kitouni, Durga P. Barik, Periyasamy Panneerselvam, Pradeep K. Das Mohapatra. Arbuscular mycorrhizal symbiosis: plant growth improvement and induction of resistance under stressful conditions. Journal of Plant Nutrition. 2021; 44 (13):1993-2028.

Chicago/Turabian Style

Debasis Mitra; Rihab Djebaili; Marika Pellegrini; Bhaswatimayee Mahakur; Aniruddha Sarker; Priya Chaudhary; Bahman Khoshru; Maddalena Del Gallo; Mahmoud Kitouni; Durga P. Barik; Periyasamy Panneerselvam; Pradeep K. Das Mohapatra. 2021. "Arbuscular mycorrhizal symbiosis: plant growth improvement and induction of resistance under stressful conditions." Journal of Plant Nutrition 44, no. 13: 1993-2028.

Journal article
Published: 05 June 2020 in Sustainability
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Excessive use of chemical products in agriculture is causing significant environmental pollution and the loss of lands and fertility of agricultural soils. Plant-growth-promoting bacteria are a valid alternative strategy for sustainable agriculture. The aim of this study was to select actinomycete strains based on their plant-growth-promoting traits and to investigate their root association abilities and biostimulant effects on Solanum lycopersicum. The strains were investigated for their phosphate solubilization ability, production of indole-3-acetic acid, hydrocyanic acid, and ammonia, and several enzymatic activities. Bacteria–plant-root associations were studied by scanning electron microscopy. A greenhouse experiment was carried out to assess inoculation effects. Of sixty isolates, fourteen strains showed significant plant-growth-promoting traits. All fourteen strains solubilized phosphate, produced ammonia, and showed several enzymatic activities at different rates. The production of indole-3-acetic acid was shown by nine strains, while hydrocyanic acid production was observed in eleven of them. Scanning electron microscopy revealed that strains have good in vitro plant root association and colonization abilities. In planta inoculation by actinomycete strains positively influenced plant growth parameters. The best results were shown by seven actinomycete strains, suggesting their possible utilization as biofertilizer agents for sustainable agriculture.

ACS Style

Rihab Djebaili; Marika Pellegrini; Maria Smati; Maddalena Del Gallo; Mahmoud Kitouni. Actinomycete Strains Isolated from Saline Soils: Plant-Growth-Promoting Traits and Inoculation Effects on Solanum lycopersicum. Sustainability 2020, 12, 4617 .

AMA Style

Rihab Djebaili, Marika Pellegrini, Maria Smati, Maddalena Del Gallo, Mahmoud Kitouni. Actinomycete Strains Isolated from Saline Soils: Plant-Growth-Promoting Traits and Inoculation Effects on Solanum lycopersicum. Sustainability. 2020; 12 (11):4617.

Chicago/Turabian Style

Rihab Djebaili; Marika Pellegrini; Maria Smati; Maddalena Del Gallo; Mahmoud Kitouni. 2020. "Actinomycete Strains Isolated from Saline Soils: Plant-Growth-Promoting Traits and Inoculation Effects on Solanum lycopersicum." Sustainability 12, no. 11: 4617.