Rizhospheric competence, plant growth promotion and biocontrol efficacy of Bacillus amyloliquefaciens subsp. plantarum strain 32a

Abdallah, Dorra Ben; Frikha‐Gargouri, Olfa; Tounsi, Slim

doi:10.1016/j.biocontrol.2018.01.013

Cited by 61 publications

(37 citation statements)

References 41 publications

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“…The strains actively colonizing the roots of plants can have a positive effect on their development. In the case of tomato, many researchers have analyzed the effect of the inoculation in a wide array of diverse bacteria, such as Pseudomonas [35][36][37][38], Methylobacterium [39], Bacillus, Burkholderia and Pseudomonas [40], Azotobacter, Bacillus, Pseudomonas and Serratia [41], Paenibacillus and Bacillus [28], Rhizobium [14], Bacillus, Erwinia and Pseudomonas [42], Bacillus [43], Burkholderia [29], Alcaligenes and Bacillus [44], Streptomyces [45], Pseudomonas, Staphylococcus, Bacillus and Pantoea [46], Bacillus [47], Arthrobacter and Pseudomonas [48] and Bacillus and Acinetobacter [49]. Nevertheless, there are no data about the effect of strains from the genus Mesorhizobium on tomato seedlings.…”

Section: Introductionmentioning

confidence: 99%

Plant Growth Promotion Abilities of Phylogenetically Diverse Mesorhizobium Strains: Effect in the Root Colonization and Development of Tomato Seedlings

et al. 2020

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Mesorhizobium contains species widely known as nitrogen-fixing bacteria with legumes, but their ability to promote the growth of non-legumes has been poorly studied. Here, we analyzed the production of indole acetic acid (IAA), siderophores and the solubilization of phosphate and potassium in a collection of 24 strains belonging to different Mesorhizobium species. All these strains produce IAA, 46% solubilized potassium, 33% solubilize phosphate and 17% produce siderophores. The highest production of IAA was found in the strains Mesorhizobium ciceri CCANP14 and Mesorhizobium tamadayense CCANP122, which were also able to solubilize potassium. Moreover, the strain CCANP14 showed the maximum phosphate solubilization index, and the strain CCANP122 was able to produce siderophores. These two strains were able to produce cellulases and cellulose and to originate biofilms in abiotic surfaces and tomato root surface. Tomato seedlings responded positively to the inoculation with these two strains, showing significantly higher plant growth traits than uninoculated seedlings. This is the first report about the potential of different Mesorhizobium species to promote the growth of a vegetable. Considering their use as safe for humans, animals and plants, they are an environmentally friendly alternative to chemical fertilizers for non-legume crops in the framework of sustainable agriculture.

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Section: Introductionmentioning

confidence: 99%

Plant Growth Promotion Abilities of Phylogenetically Diverse Mesorhizobium Strains: Effect in the Root Colonization and Development of Tomato Seedlings

et al. 2020

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“…Apart from controlling diseases, the genus Bacillus also directly or indirectly promote plant growth by several mechanisms, including production of phytohormones like IAA, siderophores production and secretion of the active enzymes, such as cellulose and protease [19,48,49]. Our pot experiment results demonstrated that B.…”

Section: Discussionmentioning

confidence: 76%

Genomic and Functional Characterization of the Endophytic Bacillus subtilis 7PJ-16 Strain, a Potential Biocontrol Agent of Mulberry Fruit Sclerotiniose

Xü

Ren

et al. 2018

Microb Ecol

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Bacillus sp. 7PJ-16, an endophytic bacterium isolated from a healthy mulberry stem and previously identified as Bacillus tequilensis 7PJ-16, exhibits strong antifungal activity and has the capacity to promote plant growth. This strain was studied for its effectiveness as a biocontrol agent to reduce mulberry fruit sclerotiniose in the field and as a growth-promoting agent for mulberry in the greenhouse. In field studies, the cell suspension and supernatant of strain 7PJ-16 exhibited biocontrol efficacy and the lowest disease incidence was reduced down to only 0.80%. In greenhouse experiments, the cell suspension (1.0 × 10 and 1.0 × 10 CFU/mL) and the cell-free supernatant (100-fold and 1000-fold dilution) stimulated mulberry seed germination and promoted mulberry seedling growth. In addition, to accurately identify the 7PJ-16 strain and further explore the mechanisms of its antifungal and growth-promoting properties, the complete genome of this strain was sequenced and annotated. The 7PJ-16 genome is comprised of two circular plasmids and a 4,209,045-bp circular chromosome, containing 4492 protein-coding genes and 116 RNA genes. This strain was ultimately designed as Bacillus subtilis based on core genome sequence analyses using a phylogenomic approach. In this genome, we identified a series of gene clusters that function in the synthesis of non-ribosomal peptides (surfactin, fengycin, bacillibactin, and bacilysin) as well as the ribosome-dependent synthesis of tasA and bacteriocins (subtilin, subtilosin A), which are responsible for the biosynthesis of numerous antimicrobial metabolites. Additionally, several genes with function that promote plant growth, such as indole-3-acetic acid biosynthesis, the production of volatile substances, and siderophores synthesis, were also identified. The information described in this study has established a good foundation for understanding the beneficial interactions between endophytes and host plants, and facilitates the further application of B. subtilis 7PJ-16 as an agricultural biofertilizer and biocontrol agent.

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“…Digestion of the colloidal chitin was indicative of chitinase production (Ben Abdallah et al . ). Other Bacillus species exhibiting chitinase activity include B. pumilus (Rishad et al .…”

Section: Secondary Metabolites and Hydrolytic Enzymes Produced By Bacmentioning

confidence: 97%

“…A recent study by Ben Abdallah et al . () investigated the biocontrol efficacy of B. amyloliquefaciens subsp. plantarum strain 32a and found that this strain not only harboured genes for the production of macrolactin, bacillaene and difficidin, but also produced hydrolytic enzymes in vitro .…”

Section: Secondary Metabolites and Hydrolytic Enzymes Produced By Bacmentioning

confidence: 99%

“…Biological control agents or biopesticides refer to natural products derived from animals, plants or micro-organisms (Arthurs and Dara 2018) that are applied as natural antagonist species to combat plant pathogens (P erez-Garc ıa et al 2011). When compared to chemical pesticides, the majority of biopesticides have a reduced risk (Arthurs and Dara 2018) due to their specific antagonism towards target pests, biodegradability in the environment (Berini et al 2018), and high efficiency (Ben Abdallah et al 2018). These qualities are very advantageous, and their environmental safety enables application close to harvesting time (Mnif and Ghribi 2015).…”

Section: Introductionmentioning

confidence: 99%

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Microbial metabolomics: essential definitions and the importance of cultivation conditions for utilizing Bacillus species as bionematicides

Horak

Engelbrecht

Rensburg

et al. 2019

J of Applied Microbiology

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Root‐knot nematodes are destructive phytopathogens that damage agricultural crops globally, and there is growing interest in the use of biocontrol based on rhizobacteria such as Bacillus to combat Meloidogyne species. It is hypothesized that nematicidal activity of Bacillus can be attributed to the production of secondary metabolites and hydrolytic enzymes. Yet, few studies have characterized these metabolites and their identities remain unknown. Others are speculative or fail to elaborate on how secondary metabolites were detected or distinguished from primary metabolites. Metabolites can be classified based on their origin as either intracellular or extracellular and based on their function, as either primary or secondary. Although this classification is in general use, the boundaries are not always well defined. An understanding of the secondary metabolite and hydrolytic enzyme classification of Bacillus species will facilitate investigations aimed at bionematicide development. This review summarizes the significance of Bacillus hydrolytic enzymes and secondary metabolites in bionematicide research and provides an overview of known classifications. The importance of appropriate cultivation conditions for optimum metabolite and enzyme production is also discussed. Finally, the use of metabolomics for the detection and identification of nematicidal compounds is considered.

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Rizhospheric competence, plant growth promotion and biocontrol efficacy of Bacillus amyloliquefaciens subsp. plantarum strain 32a

Cited by 61 publications

References 41 publications

Plant Growth Promotion Abilities of Phylogenetically Diverse Mesorhizobium Strains: Effect in the Root Colonization and Development of Tomato Seedlings

Plant Growth Promotion Abilities of Phylogenetically Diverse Mesorhizobium Strains: Effect in the Root Colonization and Development of Tomato Seedlings

Genomic and Functional Characterization of the Endophytic Bacillus subtilis 7PJ-16 Strain, a Potential Biocontrol Agent of Mulberry Fruit Sclerotiniose

Microbial metabolomics: essential definitions and the importance of cultivation conditions for utilizing Bacillus species as bionematicides

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