Antagonist effects of strains of Bacillus spp. against Rhizoctonia solani for their protection against several plant diseases: Alternatives to chemical pesticides

Abbas, Aqleem; Khan, Shahid Ullah; Khan, Wasim Ullah; Saleh, Tawfik A.; Khan, Muhammad Hafeez Ullah; Ullah, Sana; Ali, Ahmad; Ikram, Muhammad

doi:10.1016/j.crvi.2019.05.002

Cited by 62 publications

(50 citation statements)

References 84 publications

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“…Some fungi, mycoviruses, and bacteriophages have these properties. They can potentially be BCAs augmented against plant pathogens and applied in fields once or several times depending on their biological features and environments [52,53]. The secondary metabolites and compounds released by microbial or non-microbial species can also be used as pathogen inhibitors to control plant diseases.…”

Section: Suppressing Pathogensmentioning

confidence: 99%

Biological Control of Plant Diseases: An Evolutionary and Eco-Economic Consideration

Amalin

et al. 2021

Pathogens

129

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Biological control is considered as a promising alternative to pesticide and plant resistance to manage plant diseases, but a better understanding of the interaction of its natural and societal functions is necessary for its endorsement. The introduction of biological control agents (BCAs) alters the interaction among plants, pathogens, and environments, leading to biological and physical cascades that influence pathogen fitness, plant health, and ecological function. These interrelationships generate a landscape of tradeoffs among natural and social functions of biological control, and a comprehensive evaluation of its benefits and costs across social and farmer perspectives is required to ensure the sustainable development and deployment of the approach. Consequently, there should be a shift of disease control philosophy from a single concept that only concerns crop productivity to a multifaceted concept concerning crop productivity, ecological function, social acceptability, and economical accessibility. To achieve these goals, attempts should make to develop “green” BCAs used dynamically and synthetically with other disease control approaches in an integrated disease management scheme, and evolutionary biologists should play an increasing role in formulating the strategies. Governments and the public should also play a role in the development and implementation of biological control strategies supporting positive externality.

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Section: Suppressing Pathogensmentioning

confidence: 99%

Biological Control of Plant Diseases: An Evolutionary and Eco-Economic Consideration

Amalin

et al. 2021

Pathogens

129

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“…These BCAs may operate by competition, parasitism, the production of antimicrobial compounds (antibiosis), or the induction of resistance (induced systemic resistance, ISR) in the host plant [5]. Bacillus species have a long history of use as BCAs in controlling plant disease [6,7]. These bacteria produce a variety of cyclic lipopeptides (LPs) formed by cyclic peptide structures, including iturins, surfactins, and fengycins [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Transcriptome Profile Reveals The Regulatory Mechanism of Verticillium Dahliae Against Bacillus

Tian

Cheng

Wang

et al. 2021

Preprint

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Background: Verticillium dahliae, the causal agent of Verticillium wilt, is notoriously invasive in many crops and has been involved in numerous epidemics worldwide. Bacillus species, as representatives of biocontrol bacteria, produce a variety of lipopeptides (LPs), which are useful as biofungicides to many pathogenic fungi, including Verticillium dahliae. This study will explore the mechanism of resistance of V. dahliae to Bacillus and biocontrol bacteria.Results: By using in vitro confrontation bioassays, we found that under the stress induced by Bacillus, the spore vitality of V. dahliae with larger colonies was higher, and more abundant microsclerotia were formed. Then, according to the RNA-Seq analysis, the target of rapamycin (TOR) and mitophagy pathways were enriched among the significantly upregulated 542 genes observed in two co-culture groups with different colony sizes. In addition, in the group of V. dahliae with large colonies, the pathways related to cell wall synthesis, microsclerotia formation and the clearance of reactive oxygen species were regulated, and the expression of genes was up-regulated.Conclusion: This study found that the larger colonies of V. dahliae were more resistant to the antagonistic actions of Bacillus and the likelihood of the formation of homeostasis. Therefore, the prevention of Verticillium wilt by Bacillus is more effective than the treatment of an active fungal infection. These transcriptomic insights provide direction for the use of fungicides in the prevention and treatment of diseases such as Verticillium wilt.

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“…2) способность производить антимикробные вещества и различные токсины (бактерии рода Bacillus известны как активные антагонисты по отношению к различным патогенным микроорганизмам и вредителям сельского хозяйства [3][4][5][6]);…”

Section: Introductionunclassified

Development of a probiotic for animals and aquaculture based on Bacillus toyonensis B-13249 and Bacillus pumilus B-13250 strains

Malkova

Evdokimov

Ширманов

et al. 2021

Izvestiâ vuzov. Prikladnaâ himiâ i biotehnologiâ

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This article aims to develop a probiotic for animals and aquaculture based on the Bacillus toyonensis B-13249 and Bacillus pumilus B-13250 strains. The selection of a nutrient medium was conducted for cultivating the inoculum of these microorganisms. Several bacteria fermentations of the Bacillus genus were performed in biological reactors with a capacity of 15 and 250 l. A technology for obtaining a finished probiotic for animals and aquaculture was developed. The results indicate that L-broth is the most optimal nutrient medium for cultivating the studied strains. The cultivation of B. toyonensis B-13249 and B. pumilus B-13250 strains in fermenters revealed that sporulation begins after 4–8 hours of fermentation. In contrast to the vegetative medium, the fermentative medium helped the bacilli develop a higher optical density (the maximum value in the B. pumilus strain – 2.400±0.149), pH value (maximum value in the B. toyonensis strain – 8.483±0.609) and titer (at least 1010 CFU/g). After 20–24 hours of incubation, both strains of bacilli in the fermenter, almost completely pass into endospores, which serve as a signal for the start of biomass centrifugation. This was indicated by the following: from a 15 l fermenter – 83.3±6.1 g of concentrate, from a 250 l fermenter – 499.8±51.4 g. The number of bacilli in a concentrated state was at least 1·1011 CFU/g for both strains. Obtaining a finished preparation required mixing bacterial concentrates with maltodextrin to a titer of at least 1·1010 CFU/g. The number of bacteria in the preparation checked every month during the year, recorded no value less than 1·1010 CFU/g. Thus, L-broth is most favorable for growing the mother culture of the B. toyonensis B-13249 and B. pumilus B-13250 strains, and fermentative nutrient medium – for the cultivation in fermenters. The expiry date of the bacilli-based biological preparation is at least 12 months, during which the drug’s polycomponence, color and consistency are preserved, in addition to the bacteria titer (at least 1·1010 CFU/g) and their viability.

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Antagonist effects of strains of Bacillus spp. against Rhizoctonia solani for their protection against several plant diseases: Alternatives to chemical pesticides

Cited by 62 publications

References 84 publications

Biological Control of Plant Diseases: An Evolutionary and Eco-Economic Consideration

Biological Control of Plant Diseases: An Evolutionary and Eco-Economic Consideration

A Transcriptome Profile Reveals The Regulatory Mechanism of Verticillium Dahliae Against Bacillus

Development of a probiotic for animals and aquaculture based on Bacillus toyonensis B-13249 and Bacillus pumilus B-13250 strains

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