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Plant growth promoting bacteria (PGPB) have been the target of intensive research studies toward their efficient use in the field as biofertilizers, biocontrol, and bioremediation agents among numerous other applications. Recent trends in the field of PGPB research led to the development of versatile multifaceted PGPB that can be used in different field conditions such as biocontrol of plant pathogens in metal contaminated soils. Unfortunately, all these research efforts lead to the development of PGPB that failed to perform in salty environments. Therefore, it is urgently needed to address this drawback of these PGPB toward their efficient performance in salinity context. In this paper we provide a review of state-of-the-art research in the field of PGPB and propose a road map for the development of next generation versatile and multifaceted PGPB that can perform in salinity. Beyond soil desalinization, our study paves the way towards the development of PGPB able to provide services in diverse salty environments such as heavy metal contaminated, or pathogen threatened. Smart development of salinity adapted next generation biofertilizers will inevitably allow for mitigation and alleviation of biotic and abiotic threats to plant productivity in salty environments.
Hafsa Cherif-Silini; Allaoua Silini; Ali Chenari Bouket; Faizah N. Alenezi; Lenka Luptakova; Nawel Bouremani; Justyna Anna Nowakowska; Tomasz Oszako; Lassaad Belbahri. Tailoring Next Generation Plant Growth Promoting Microorganisms as Versatile Tools beyond Soil Desalinization: A Road Map towards Field Application. Sustainability 2021, 13, 4422 .
AMA StyleHafsa Cherif-Silini, Allaoua Silini, Ali Chenari Bouket, Faizah N. Alenezi, Lenka Luptakova, Nawel Bouremani, Justyna Anna Nowakowska, Tomasz Oszako, Lassaad Belbahri. Tailoring Next Generation Plant Growth Promoting Microorganisms as Versatile Tools beyond Soil Desalinization: A Road Map towards Field Application. Sustainability. 2021; 13 (8):4422.
Chicago/Turabian StyleHafsa Cherif-Silini; Allaoua Silini; Ali Chenari Bouket; Faizah N. Alenezi; Lenka Luptakova; Nawel Bouremani; Justyna Anna Nowakowska; Tomasz Oszako; Lassaad Belbahri. 2021. "Tailoring Next Generation Plant Growth Promoting Microorganisms as Versatile Tools beyond Soil Desalinization: A Road Map towards Field Application." Sustainability 13, no. 8: 4422.
There is a great interest in mitigating soil salinity that limits plant growth and productivity. In this study, eighty-nine strains were isolated from the rhizosphere and endosphere of two halophyte species (Suaeda mollis and Salsola tetrandra) collected from three chotts in Algeria. They were screened for diverse plant growth-promoting traits, antifungal activity and tolerance to different physico-chemical conditions (pH, PEG, and NaCl) to evaluate their efficiency in mitigating salt stress and enhancing the growth of Arabidopsis thaliana and durum wheat under NaCl–stress conditions. Three bacterial strains BR5, OR15, and RB13 were finally selected and identified as Bacillus atropheus. The Bacterial strains (separately and combined) were then used for inoculating Arabidopsis thaliana and durum wheat during the seed germination stage under NaCl stress conditions. Results indicated that inoculation of both plant spp. with the bacterial strains separately or combined considerably improved the growth parameters. Three soils with different salinity levels (S1 = 0.48, S2 = 3.81, and S3 = 2.80 mS/cm) were used to investigate the effects of selected strains (BR5, OR15, and RB13; separately and combined) on several growth parameters of wheat plants. The inoculation (notably the multi-strain consortium) proved a better approach to increase the chlorophyll and carotenoid contents as compared to control plants. However, proline content, lipid peroxidation, and activities of antioxidant enzymes decreased after inoculation with the plant growth-promoting rhizobacteria (PGPR) that can attenuate the adverse effects of salt stress by reducing the reactive oxygen species (ROS) production. These results indicated that under saline soil conditions, halotolerant PGPR strains are promising candidates as biofertilizers under salt stress conditions.
Souhila Kerbab; Allaoua Silini; Ali Chenari Bouket; Hafsa Cherif-Silini; Manal Eshelli; Nour El Houda Rabhi; Lassaad Belbahri. Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria. Applied Sciences 2021, 11, 1034 .
AMA StyleSouhila Kerbab, Allaoua Silini, Ali Chenari Bouket, Hafsa Cherif-Silini, Manal Eshelli, Nour El Houda Rabhi, Lassaad Belbahri. Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria. Applied Sciences. 2021; 11 (3):1034.
Chicago/Turabian StyleSouhila Kerbab; Allaoua Silini; Ali Chenari Bouket; Hafsa Cherif-Silini; Manal Eshelli; Nour El Houda Rabhi; Lassaad Belbahri. 2021. "Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria." Applied Sciences 11, no. 3: 1034.
In the arid region Bou-Saâda at the South of Algeria, durum wheat Triticum durum L. cv Waha production is severely threatened by abiotic stresses, mainly drought and salinity. Plant growth-promoting rhizobacteria (PGPR) hold promising prospects towards sustainable and environmentally-friendly agriculture. Using habitat-adapted symbiosis strategy, the PGPR Pantoea agglomerans strain Pa was recovered from wheat roots sampled in Bou-Saâda, conferred alleviation of salt stress in durum wheat plants and allowed considerable growth in this unhostile environment. Strain Pa showed growth up to 35 °C temperature, 5–10 pH range, and up to 30% polyethylene glycol (PEG), as well as 1 M salt concentration tolerance. Pa strain displayed pertinent plant growth promotion (PGP) features (direct and indirect) such as hormone auxin biosynthesis, production of 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and ammonia and phosphate solubilization. PGPR features were stable over wide salt concentrations (0–400 mM). Pa strain was also able to survive in seeds, in the non-sterile and sterile wheat rhizosphere, and was shown to have an endophytic life style. Phylogenomic analysis of strain Pa indicated that Pantoea genus suffers taxonomic imprecision which blurs species delimitation and may have impacted their practical use as biofertilizers. When applied to plants, strain Pa promoted considerable growth of wheat seedlings, high chlorophyll content, lower accumulation of proline, and favored K+ accumulation in the inoculated plants when compared to Na+ in control non-inoculated plants. Metabolomic profiling of strain Pa under one strain many compounds (OSMAC) conditions revealed a wide diversity of secondary metabolites (SM) with interesting salt stress alleviation and PGP activities. All these findings strongly promote the implementation of Pantoea agglomerans strain Pa as an efficient biofertilizer in wheat plants culture in arid and salinity-impacted regions.
Hafsa Cherif-Silini; Bathini Thissera; Ali Chenari Bouket; Nora Saadaoui; Allaoua Silini; Manal Eshelli; Faizah N. Alenezi; Armelle Vallat; Lenka Luptakova; Bilal Yahiaoui; Semcheddine Cherrad; Sebastien Vacher; Mostafa E. Rateb; Lassaad Belbahri. Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal. International Journal of Molecular Sciences 2019, 20, 3989 .
AMA StyleHafsa Cherif-Silini, Bathini Thissera, Ali Chenari Bouket, Nora Saadaoui, Allaoua Silini, Manal Eshelli, Faizah N. Alenezi, Armelle Vallat, Lenka Luptakova, Bilal Yahiaoui, Semcheddine Cherrad, Sebastien Vacher, Mostafa E. Rateb, Lassaad Belbahri. Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal. International Journal of Molecular Sciences. 2019; 20 (16):3989.
Chicago/Turabian StyleHafsa Cherif-Silini; Bathini Thissera; Ali Chenari Bouket; Nora Saadaoui; Allaoua Silini; Manal Eshelli; Faizah N. Alenezi; Armelle Vallat; Lenka Luptakova; Bilal Yahiaoui; Semcheddine Cherrad; Sebastien Vacher; Mostafa E. Rateb; Lassaad Belbahri. 2019. "Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal." International Journal of Molecular Sciences 20, no. 16: 3989.