The antibacterial activity of bacterial endophytes isolated from Combretum molle

Diale, Mamonokane Olga; Ubomba-Jaswa, Eunice; Serepa-Dlamini, Mahloro Hope

doi:10.5897/ajb2017.16349

Cited by 17 publications

(5 citation statements)

References 27 publications

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“…pneumoniae, Proteus mirabilis, Shigella flexneri , and S. aureus (Beiranvand et al, 2017; Figure 1, 3), whereas Malaysian plants-endophytic B. subtilis possessed antibacterial activity against S. aureus , methicillin resistant S. aureus , and P. aeruginosa (Fikri et al, 2018; Figure 2B). The African Combretum molle -endophytic Bacillus and Lysinibacillus species exhibited antibacterial activity against B. cereus, E. coli, P. aeruginosa , and S. aureus (Diale et al, 2018; Supplementary Table S1).…”

Section: Gram-positive Endophytes Against Human/animal Pathogensmentioning

confidence: 99%

Bioactive Products From Plant-Endophytic Gram-Positive Bacteria

et al. 2019

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Endophytes constitute plant-colonizing microorganisms in a mutualistic symbiosis relationship. They are found in most ecosystems reducing plant crops’ biotic and abiotic stressors by stimulating immune responses, excluding plant pathogens by niche competition, and participating in antioxidant activities and phenylpropanoid metabolism, whose activation produces plant defense, structural support, and survival molecules. In fact, metabolomic studies have demonstrated that endophyte genes associated to specific metabolites are involved in plant growth promotion (PGP) by stimulating plant hormones production such as auxins and gibberellins or as plant protective agents against microbial pathogens, cancer, and insect pests, but eco-friendly and eco-safe. A number of metabolites of Gram-positive endophytes isolated from agriculture, forest, mangrove, and medicinal plants, mainly related to the Firmicutes phyla, possess distinctive biocontrol and plant growth-promoting activities. In general, Actinobacteria and Bacillus endophytes produce aromatic compounds, lipopeptides, plant hormones, polysaccharides, and several enzymes linked to phenylpropanoid metabolism, thus representing high potential for PGP and crop management strategies. Furthermore, Actinobacteria have been shown to produce metabolites with antimicrobial and antitumor activities, useful in agriculture, medicine, and veterinary areas. The great endophytes diversity, their metabolites production, and their adaptation to stress conditions make them a suitable and unlimited source of novel metabolites, whose application could reduce agrochemicals usage in food and drugs production.

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Section: Gram-positive Endophytes Against Human/animal Pathogensmentioning

confidence: 99%

Bioactive Products From Plant-Endophytic Gram-Positive Bacteria

et al. 2019

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“…strain HSTU-ABk15 possessing growth inhibitor traits against S. epidermidis can serve as sources of novel antibiotics [ 58 ]. Bacterial strains, such as the Bacillus sp., Lysinibacillus , Streptomyces , Streptomyces parvulus Av-R5, also had anti-bacterial activity against S. aureus [ 59 , 60 , 61 , 62 , 63 ]. Endophytes are also the storehouse of several kinds of bioactive metabolites, including phenolics, alkaloids, quinones, steroids, saponins, tannins, and terpenoids, which makes them serve as potential anti-cancer, anti-malarial, anti-tuberculosis, anti-viral, anti-diabetic, anti-inflammatory, anti-arthritis, and immunosuppressive agents, as well as helping host plants become more resistant to abiotic and biotic stresses [ 64 ].…”

Section: Discussionmentioning

confidence: 99%

Characterization of Growth-Promoting Activities of Consortia of Chlorpyrifos Mineralizing Endophytic Bacteria Naturally Harboring in Rice Plants—A Potential Bio-Stimulant to Develop a Safe and Sustainable Agriculture

Prodhan

Rahman

et al. 2023

Microorganisms

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Eighteen pesticide-degrading endophytic bacteria were isolated from the roots, stems, and leaves of healthy rice plants and identified through 16S rRNA gene sequencing. Furthermore, biochemical properties, including enzyme production, dye degradation, anti-bacterial activities, plant-growth-promoting traits, including N-fixation, P-solubilization, auxin production, and ACC-deaminase activities of these naturally occurring endophytic bacteria along with their four consortia, were characterized. Enterobacter cloacae HSTU-ABk39 and Enterobacter sp. HSTU-ABk36 displayed inhibition zones of 41.5 ± 1.5 mm, and 29 ± 09 mm against multidrug-resistant human pathogenic bacteria Staphylococcus aureus and Staphylococcus epidermidis, respectively. FT-IR analysis revealed that all eighteen isolates were able to degrade chlorpyrifos pesticide. Our study confirms that pesticide-degrading endophytic bacteria from rice plants play a key role in enhancing plant growth. Notably, rice plants grown in pots containing reduced urea (30%) mixed with either endophytic bacterial consortium-1, consortium-2, consortium-3, or consortia-4 demonstrated an increase of 17.3%, 38.6%, 18.2%, and 39.1% yields, respectively, compared to the control plants grown in pots containing 100% fertilizer. GC–MS/MS analysis confirmed that consortia treatment caused the degradation of chlorpyrifos into different non-toxic metabolites, including 2-Hydroxy-3,5,6 trichloropyridine, Diethyl methane phosphonate, Phorate sulfoxide, and Carbonochloridic. Thus, these isolates could be deployed as bio-stimulants to improve crop production by creating a sustainable biological system.

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“…Bacterial strains of S. aureus (ATCC 25923) and K. pneumoniae (ATCC 13822) were each incubated with and without AuNPs (62.5 μg/mL) at 37 °C for 24 h. Samples were collected from both cultures and processed for SEM analysis by adapting the method by [ 36 ]. In brief, the samples were centrifuged at 1100× g for 10 min, and the supernatant was poured out.…”

Section: Methodsmentioning

confidence: 99%

Facile Green, Room-Temperature Synthesis of Gold Nanoparticles Using Combretum erythrophyllum Leaf Extract: Antibacterial and Cell Viability Studies against Normal and Cancerous Cells

et al. 2021

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We herein report a facile, green, cost-effective, plant-mediated synthesis of gold nanoparticles (AuNPs) for the first time using Combretum erythrophyllum (CE) plant leaves. The synthesis was conducted at room temperature using CE leaf extract serving as a reducing and capping agent. The as-synthesized AuNPs were found to be crystalline, well dispersed, and spherical in shape with an average diameter of 13.20 nm and an excellent stability of over 60 days. The AuNPs showed broad-spectrum antibacterial activities against both pathogenic Gram-positive (Staphylococcus epidermidis (ATCC14990), Staphylococcus aureus (ATCC 25923), Mycobacterium smegmatis (MC 215)) and Gram-negative bacteria (Proteus mirabilis (ATCC 7002), Escherichia coli (ATCC 25922), Klebsiella pneumoniae (ATCC 13822), Klebsiella oxytoca (ATCC 8724)), with a minimum inhibition concentration of 62.5 µg/mL. In addition, the as-synthesized AuNPs were highly stable with exceptional cell viability towards normal cells (BHK- 21) and cancerous cancer cell lines (cervical and lung cancer).

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The antibacterial activity of bacterial endophytes isolated from Combretum molle

Cited by 17 publications

References 27 publications

Bioactive Products From Plant-Endophytic Gram-Positive Bacteria

Bioactive Products From Plant-Endophytic Gram-Positive Bacteria

Characterization of Growth-Promoting Activities of Consortia of Chlorpyrifos Mineralizing Endophytic Bacteria Naturally Harboring in Rice Plants—A Potential Bio-Stimulant to Develop a Safe and Sustainable Agriculture

Facile Green, Room-Temperature Synthesis of Gold Nanoparticles Using Combretum erythrophyllum Leaf Extract: Antibacterial and Cell Viability Studies against Normal and Cancerous Cells

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