Potential of a novel endophytic Bacillus velezensis in tomato growth promotion and protection against Verticillium wilt disease

Dhouib, H.; Zouari, Imen; Abdallah, Dorra Ben; Belbahri, Lassaâd; Taktak, Wafa; Triki, Mohamed Ali; Tounsi, Slim

doi:10.1016/j.biocontrol.2019.104092

Cited by 64 publications

(43 citation statements)

References 61 publications

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“…The preventive treatment of pepper plants with B. velezensis IP22 cultivation broth has significantly contributed to the suppression of phytopathogenic X. euvesicatoria strains, as well as to reduction of disease symptoms spreading. Differences in plant coloration between treated and untreated plants can be explained by promoting effects that B. velezensis has on plants as a part of its modes of action involved in antimicrobial activity, which is in agreement with recent studies on this agent [ 53 , 54 , 55 , 56 ] and which is yet to be investigated in our future studies. The results of in planta assaying suggest the high potential of biocontrol agents based on B. velezensis IP22 produced in the previously described way under the optimized production conditions at a laboratory scale in suppression of pepper bacterial spot caused by X. euvesicatoria strains.…”

Section: Discussionsupporting

confidence: 90%

Pepper Bacterial Spot Control by Bacillus velezensis: Bioprocess Solution

et al. 2020

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Pepper bacterial spot is one of the most severe plant diseases in terms of infection persistence and economic losses when it comes to fresh pepper fruits used in nutrition and industrial processing. In this study, Bacillus velezensis IP22 isolated from fresh cheese was used as a biocontrol agent of pepper bacterial spot, whose main causal agent is the cosmopolitan pathogen Xanthomonas euvesicatoria. After optimization of the cultivation medium composition aimed at maximizing of the antimicrobial activity against X. euvesicatoria and validation of the optimized medium at the scale of a laboratory bioreactor, in planta tests were performed. The results have showed significant suppression of bacterial spot symptoms in pepper plants by the produced biocontrol agent, as well as reduction of disease spreading on the healthy (uninoculated) pepper leaves. Furthermore, HPLC-MS (high pressure liquid chromatography–mass spectrometry) analysis was employed to examine antimicrobial metabolites produced by B. velezensis IP22, where lipopeptides were found with similar m/z values compared to lipopeptides from fengycin and locillomycin families. The bioprocess solution developed at the laboratory scale investigated in this study represents a promising strategy for production of pepper bacterial spot biocontrol agent based on B. velezensis IP22, a food isolate with a great perspective for application in plant protection.

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Section: Discussionsupporting

confidence: 90%

Pepper Bacterial Spot Control by Bacillus velezensis: Bioprocess Solution

et al. 2020

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“…Antagonistic activity against the pathogens Monilinia fructicola [ 61 ] and B. cinerea (60%) reached maximum levels of > 80% and 60%, respectively, mainly due to the large amount of lipopeptides produced (10 g/L) [ 67 ]. Many studies of olive, tomato, corn, peanut, pepper, maize and rice crop yields have also described the biocontrol activity of B. velezensis strains against phytopathogens such as Verticillium dahliae , Fusarium graminerarum , Sclerotium rolfsii , Phytophthora and B. cinerea [ 68 , 69 , 70 , 71 , 72 , 73 , 74 ]. Our results are in line with the findings of Lee et al (2006) [ 75 ] who investigated the effect of radicular applications of B. subtilis WXCDD105 on B. cinerea in tomato plants.…”

Section: Discussionmentioning

confidence: 99%

Crop Protection against Botrytis cinerea by Rhizhosphere Biological Control Agent Bacillus velezensis XT1

Toral¹,

Rodríguez

Béjar

et al. 2020

Microorganisms

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This study aims to evaluate the use of Bacillus velezensis strain XT1 as a plant growth-promoting rhizobacterium (PGPR) and biocontrol agent against B. cinerea in tomato and strawberry plants. Foliar and radicular applications of strain XT1 increased plant total biomass as compared to the control and B. cinerea-infected plants, with root applications being, on the whole, the most effective mode of treatment. Applications of the bacterium were found to reduce infection parameters such as disease incidence and severity by 50% and 60%, respectively. We analyzed stress parameters and phytohormone content in order to evaluate the capacity of XT1 to activate the defense system through phytohormonal regulation. Overall, the application of XT1 reduced oxidative damage, while the H2O2 and malondialdehyde (MDA) content was lower in XT1-treated and B. cinerea-infected plants as compared to non-XT1-treated plants. Moreover, treatment with XT1 induced callose deposition, thus boosting the response to pathogenic infection. The results of this study suggest that the signaling and activation pathways involved in defense mechanisms are mediated by jasmonic acid (JA) and ethylene hormones, which are induced by preventive treatment with XT1. The study also highlights the potential of preventive applications of strain XT1 to activate defense mechanisms in strawberry and tomato plants through hormone regulation.

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“…Indirect mechanisms include prevention of the deleterious effects of phytopathogenic organisms by induction of systemic resistance (ISR), the synthesis of antimicrobial compounds, and the release of volatile organic compounds [3,4]. Direct promotion of plant growth may occur by atmospheric nitrogen fixation and subsequent supply to plants, secretion of siderophores, synthesis of phytohormones such as indole acetic acid (IAA), phosphate solubilization, and synthesis of enzymes that can modulate plant ethylene levels [3,14].…”

Section: Introductionmentioning

confidence: 99%

Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria

et al. 2021

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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.

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Potential of a novel endophytic Bacillus velezensis in tomato growth promotion and protection against Verticillium wilt disease

Cited by 64 publications

References 61 publications

Pepper Bacterial Spot Control by Bacillus velezensis: Bioprocess Solution

Pepper Bacterial Spot Control by Bacillus velezensis: Bioprocess Solution

Crop Protection against Botrytis cinerea by Rhizhosphere Biological Control Agent Bacillus velezensis XT1

Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria

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