A novel streptomyces rhizobacteria from desert soil with diverse anti-fungal properties

Abdelmoteleb, Ali; González-Mendoza, Daniel

doi:10.1016/j.rhisph.2020.100243

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…By comparing them with other studies (Aouar et al 2012;Xue et al 2013;Jog et al 2014;Anwar et al 2016), it could be said that members of Streptomyces genus are the most common among the rhizosphere isolates. Goudjal et al (2014), Mouloud et al (2016), Abdelmoteleb, and Mendoza (2020) have explored rhizospheric Saharan soils. They have isolated actinobacteria, the majority of them were allowed to Streptomyces genus.…”

Section: Screening Of Antagonistic Isolatesmentioning

confidence: 99%

Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

2020

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Abstract. Aouar L, Boukelloul I, Benadjila A. 2020. Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties. Biodiversitas 21: 5672-5683. To produce new bioactive substances of agricultural interest, extreme ecosystems can be a source of unexplored microorganisms. Accordingly, in this study, twenty-two actinobacteria strains were obtained from rhizospheric arid soils of palm groves collected from Biskra and El Oued in the Algerian Sahara. All isolates were examined for the in vitro antifungal potential towards phytopathogenic fungi: Aspergillus flavus, Verticillium dahlia, Rhizoctonia solani, Botrytis cinerea and Fusarium oxysporum as well as for their antibacterial property toward phytopathogenic bacteria: Streptomyces scabiei, Pectobacterium carotovorum and Agrobacterium tumefaciens. The three isolates (13%) that inhibited at least five pathogens were then selected, identified and assessed for their attributes to produce indole-3-acetic acid (IAA) and siderophores, to solubilize phosphate, and to antagonize Streptomyces scabiei in vivo. According to phylogenetic analysis performed with 16S rDNA sequence, chemotaxonomy and phenotypic characteristics, the strain SO1, which inhibited all tested pathogens, was assigned to Streptomyces flaveus. While, strains SO2 and SB1 were affiliated to Streptomyces enissocaesilis and Streptomyces albidoflavus, respectively. All strains produced IAA but only SO1 and SB1 were able to elaborate siderophores catecholate-type. Two strains SO1 and SO2 exhibited a capacity to solubilize phosphate and SO1 was able to suppress the pathogenic effect of Streptomyces scabiei on radish seedlings. The findings indicate that SO1 strain may reveal the potential for use as a biocontrol agent and plant growth promoter.

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Section: Screening Of Antagonistic Isolatesmentioning

confidence: 99%

Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

2020

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“…Rhizosphere soil has long been considered as the main source of isolation of useful beneficial microorganisms [ 1 , 2 ]. At present, numerous soil fungi isolated from soil are employed as biological control agents, especially fungi in the genus Trichoderma .…”

Section: Introductionmentioning

confidence: 99%

Biocontrol Mechanisms of Trichoderma koningiopsis PSU3-2 against Postharvest Anthracnose of Chili Pepper

Ruangwong

Pornsuriya

Pitija³

et al. 2021

JoF

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Several mechanisms are involved in the biological control of plant pathogens by the soil-borne Trichoderma spp. fungi. The aim of this study was to characterize a new strain of Trichoderma as a potential biological control agent to control the postharvest anthracnose of chili pepper caused by Colletotrichumgloeosporioides. A total of nine strains of Trichoderma spp. were screened for their antifungal activity using a dual culture assay against C.gloeosporioides. Trichoderma koningiopsis PSU3-2 was shown to be the most effective strain, with a percentage inhibition of 79.57%, which was significantly higher than that of other strains (p < 0.05). In the sealed plate method, T. koningiopsis PSU3-2 suppressed the growth of C.gloeosporioides by 38.33%. Solid-phase microextraction (SPME) was applied to trap volatiles emitted by T. koningiopsis PSU3-2, and the GC/MS profiling revealed the presence of antifungal compounds including azetidine, 2-phenylethanol, and ethyl hexadecanoate. The production of cell-wall-degrading enzymes (CWDEs) was assayed through cell-free culture filtrate (CF) of PSU3-2, and the enzyme activity of chitinase and β-1,3-glucanase was 0.06 and 0.23 U/mL, respectively, significantly higher than that in the control (p < 0.05). Scanning electron microscopy of the mycelium incubated in cell-free CF of T. koningiopsis PSU3-2 showed the abnormal shape of C.gloeosporioides hyphae. Application of T. koningiopsis PSU3-2 by the dipping method significantly reduced the lesion size (p < 0.05) after inoculation with C.gloeosporioides compared to the control, and there was no disease symptom development in T. koningiopsis PSU3-2-treated chili pepper. This study demonstrates that T. koningiopsis PSU3-2 is an effective antagonistic microorganism and a promising biocontrol agent against postharvest anthracnose of chili pepper, acting with multiple mechanisms.

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“…A PGPM may possess one or more mechanisms of biocontrol. For instance, species from genres Bacillus, Pseudomonas, Alcaligenes, Rhizobium, Aeromonas, and Streptomyces have been identified as biocontrol agents, and their ability to control plant pathogens have been well-documented (Ahmad et al, 2008;Alemu, 2016;Das et al, 2017;Zachow et al, 2017;Abdelmoteleb and González-Mendoza, 2020). These biocontrol agents produce biological compounds (secondary metabolites) that have broad spectrum effects, which may cause beneficial activity against plant pathogens.…”

Section: Pgpr Derived Crop Biotic Stress Tolerancementioning

confidence: 99%

PGPR in Agriculture: A Sustainable Approach to Increasing Climate Change Resilience

Shah

Nazari

Antar

et al. 2021

Front. Sustain. Food Syst.

164

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Growing environmental concerns are potentially narrowing global yield capacity of agricultural systems. Climate change is the most significant problem the world is currently facing. To meet global food demand, food production must be doubled by 2050; over exploitation of arable lands using unsustainable techniques might resolve food demand issues, but they have negative environmental effects. Current crop production systems are a major reason for changing global climate through diminishing biodiversity, physical and chemical soil degradation, and water pollution. The over application of fertilizers and pesticides contribute to climate change through greenhouse gas emissions (GHG) and toxic soil depositions. At this crucial time, there is a pressing need to transition to more sustainable crop production practices, ones that concentrate more on promoting sustainable mechanisms, which enable crops to grow well in resource limited and environmentally challenging environments, and also develop crops with greater resource use efficiency that have optimum sustainable yields across a wider array of environmental conditions. The phytomicrobiome is considered as one of the best strategies; a better alternative for sustainable agriculture, and a viable solution to meet the twin challenges of global food security and environmental stability. Use of the phytomicrobiome, due to its sustainable and environmentally friendly mechanisms of plant growth promotion, is becoming more widespread in the agricultural industry. Therefore, in this review, we emphasize the contribution of beneficial phytomicrobiome members, particularly plant growth promoting rhizobacteria (PGPR), as a strategy to sustainable improvement of plant growth and production in the face of climate change. Also, the roles of soil dwelling microbes in stress amelioration, nutrient supply (nitrogen fixation, phosphorus solubilization), and phytohormone production along with the factors that could potentially affect their efficiency have been discussed extensively. Lastly, limitations to expansion and use of biobased techniques, for instance, the perspective of crop producers, indigenous microbial competition and regulatory approval are discussed. This review largely focusses on the importance and need of sustainable and environmentally friendly approaches such as biobased/PGPR-based techniques in our agricultural systems, especially in the context of current climate change conditions, which are almost certain to worsen in near future.

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A novel streptomyces rhizobacteria from desert soil with diverse anti-fungal properties

Cited by 19 publications

References 24 publications

Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

Biocontrol Mechanisms of Trichoderma koningiopsis PSU3-2 against Postharvest Anthracnose of Chili Pepper

PGPR in Agriculture: A Sustainable Approach to Increasing Climate Change Resilience

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