Potential of Bacillus amyloliquefaciens for biocontrol of bacterial canker of tomato incited by Clavibacter michiganensis ssp. michiganensis

Gautam, Swati; Chauhan, Anjali; Sharma, R. L.; Sehgal, Ravinder N. M.; Shirkot, C. K.

doi:10.1016/j.micpath.2019.03.006

Cited by 38 publications

(14 citation statements)

References 34 publications

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“…The potential of B. amyloliquefaciens for biocontrol of Clavibacter michiganensis ssp. michiganensis was attributed to the production of lytic enzymes (cellulase, lipase, protease, chitinase) [ 49 ]. Hydrolytic enzymes (protease, glucanase, chitinase) produced by Bacillus sp.…”

Section: Mechanisms Of Biological Controlmentioning

confidence: 99%

“…For instance, siderophore-producing B. subtilis reduced the incidence of Fusarium wilt, and enhanced the growth and yield of pepper [ 52 ]. Several studies indicated synergistic antimicrobial effects of siderophores along with lipopeptides and/or lytic enzymes [ 42 , 49 , 50 ]. Similarly, B. subtilis is a promising biological control agent against Bipolaris sorokiniana due to production of siderophores, chitinase, and cellulase [ 53 ].…”

Section: Mechanisms Of Biological Controlmentioning

confidence: 99%

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The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

2020

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Bacillus spp. produce a variety of compounds involved in the biocontrol of plant pathogens and promotion of plant growth, which makes them potential candidates for most agricultural and biotechnological applications. Bacilli exhibit antagonistic activity by excreting extracellular metabolites such as antibiotics, cell wall hydrolases, and siderophores. Additionally, Bacillus spp. improve plant response to pathogen attack by triggering induced systemic resistance (ISR). Besides being the most promising biocontrol agents, Bacillus spp. promote plant growth via nitrogen fixation, phosphate solubilization, and phytohormone production. Antagonistic and plant growth-promoting strains of Bacillus spp. might be useful in formulating new preparations. Numerous studies of a wide range of plant species revealed a steady increase in the number of Bacillus spp. identified as potential biocontrol agents and plant growth promoters. Among different mechanisms of action, it remains unclear which individual or combined traits could be used as predictors in the selection of the best strains for crop productivity improvement. Due to numerous factors that influence the successful application of Bacillus spp., it is necessary to understand how different strains function in biological control and plant growth promotion, and distinctly define the factors that contribute to their more efficient use in the field.

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Section: Mechanisms Of Biological Controlmentioning

confidence: 99%

Section: Mechanisms Of Biological Controlmentioning

confidence: 99%

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

2020

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“…In agreement with in vitro assays, the inoculation of olive plantlets with B. amyloliquefaciens P41 together with Pss reduced significantly the OK disease severity, knots weight and Pss population size, when compared to pathogen (Pss) inoculated plants. Likewise, other studies have demonstrated the beneficial effects of B. amyloliquefaciens on disease suppression on other crops, such as tomato (Gautam et al, 2019), apple (Zhang et al, 2015), pistachio (Siahmoshteh et al, 2017), and lettuce (Chowdhury et al, 2013). Besides displaying biocontrol traits, several strains of B. amyloliquefaciens have been previously described as plant growth promoters (Asari et al, 2016;Abdallah et al, 2018).…”

Section: Discussionmentioning

confidence: 98%

Screening the Olive Tree Phyllosphere: Search and Find Potential Antagonists Against Pseudomonas savastanoi pv. savastanoi

et al. 2020

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Olive knot (OK) is a widespread bacterial disease, caused by Pseudomonas savastanoi pv. savastanoi ( Pss ), which currently has not effective control methods. The use of naturally occurring microbial antagonists, such as bacteria, as biocontrol agents could be a strategy to manage this disease. The objective of this work was to select bacteria from olive tree phyllosphere able to antagonize Pss using in vitro and in planta experiments. The elucidation of their modes of action and the potential relationship between antagonism and bacteria origin has been investigated, as well. To this end, 60 bacterial isolates obtained from the surface and inner tissues of different organs (leaves, twigs, and knots), from two olive cultivars of varying susceptibilities to OK, were screened for their in vitro antagonistic effect against Pss . A total of 27 bacterial strains were able to significantly inhibit Pss growth, being this effect linked to bacteria origin. Strains from OK-susceptible cultivar and colonizing the surface of plant tissues showed the strongest antagonistic potential. The antagonistic activity was potentially due to the production of volatile compounds, siderophores and lytic enzymes. Bacillus amyloliquefaciens P41 was the most effective antagonistic strain and their capacity to control OK disease was subsequently assayed using in planta experiments. This strain significantly reduces OK disease severity (43.7%), knots weight (55.4%) and population size of Pss (26.8%), while increasing the shoot dry weight (55.0%) and root water content (39.6%) of Pss -infected olive plantlets. Bacterial isolates characterized in this study, in particular B. amyloliquefaciens P41, may be considered as promising biocontrol candidates for controlling OK disease.

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“…There are a number of different reasons for their prevalent use: they present advantages over Gram-negative bacteria due to spores they form, allowing them to survive unfavorable conditions; they are easy to formulate and exhibit a prolonged shelf-life and high temperature stability (Wu et al, 2018;Xu et al, 2018;Zhang et al, 2018). Bacillus species such as Bacillus licheniformis, Bacillus cereus, Bacillus subtilis, Bacillus coagulans, and Bacillus clausii are already used as bacterial antagonists of plant pathogens and as plant growth-promoting bacteria (Cisternas-Jamet et al, 2019;Gautam et al, 2019). To better understand the relationship between B. amyloliquefaciens ZJU1 and other Bacillus strains, we performed comparative genomic analysis of the 21 representative strains in this work, which revealed a high level of conservation among the genomes.…”

Section: Discussionmentioning

confidence: 99%

Biocontrol Potential of a Novel Endophytic Bacterium From Mulberry (Morus) Tree

Xie

Vallet

Sun

et al. 2020

Front. Bioeng. Biotechnol.

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Mulberry (Morus) is an economically important woody tree that is suitable for use in sericulture as forage and in medicine. However, this broad-leaved tree is facing multiple threats ranging from phytopathogens to insect pests. Here, a Gram-positive, endospore-forming bacterium (ZJU1) was frequently isolated from healthy mulberry plants by screening for foliar endophytes showing antagonism against pathogens and pests. Whole-genome sequencing and annotation resulted in a genome size of 4.06 Mb and classified the bacterium as a novel strain of Bacillus amyloliquefaciens that has rarely been identified from tree leaves. An integrative approach combining traditional natural product chemistry, activity bioassays, and high-resolution mass spectrometry confirmed that strain ZJU1 uses a blend of antimicrobials including peptides and volatile organic compounds to oppose Botrytis cinerea, a major phytopathogenic fungus causing mulberry gray mold disease. We showed that the inoculation of endophyte-free plants with ZJU1 significantly decreased both leaf necrosis and mortality under field conditions. In addition to the direct interactions of endophytes with foliar pathogens, in planta studies suggested that the inoculation of endophytes also induced plant systemic defense, including high expression levels of mulberry disease resistance genes. Moreover, when applied to the generalist herbivore Spodoptera litura, ZJU1 was sufficient to reduce the pest survival rate below 50%. A previously undiscovered crystal toxin (Cry10Aa) could contribute to this insecticidal effect against notorious lepidopteran pests. These unique traits clearly demonstrate that B. amyloliquefaciens ZJU1 is promising for the development of successful strategies for biocontrol applications. The search for new plant-beneficial microbes and engineering microbiomes is therefore of great significance for sustainably improving plant performance.

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Potential of Bacillus amyloliquefaciens for biocontrol of bacterial canker of tomato incited by Clavibacter michiganensis ssp. michiganensis

Cited by 38 publications

References 34 publications

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

Screening the Olive Tree Phyllosphere: Search and Find Potential Antagonists Against Pseudomonas savastanoi pv. savastanoi

Biocontrol Potential of a Novel Endophytic Bacterium From Mulberry (Morus) Tree

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