Pseudomonas and Bacillus: A biological tool for crop protection

Muthukumar, A.; Raj, T. S. Punith; Prabhukarthikeyan, S.R.; Kumar, Rajeev; Keerthana, U.

doi:10.1016/b978-0-323-85577-8.00006-8

Cited by 6 publications

(4 citation statements)

References 73 publications

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“…The production of HCN and siderophores in bacterial cells serves as a defense mechanism against other microbes. While known to be good siderophore producers that inhibit the growth of several plant pathogens, Bacillus species have been shown to possess moderate HCN production ability ( Muthukumar et al, 2022 ). In this study, all Bacillus strains could produce siderophores; however, B .…”

Section: Discussionmentioning

confidence: 99%

“…Such microbes produce a variety of compounds that inhibit the growth of competing organisms. Some of the most important antagonistic mechanisms involve the production of hydrogen cyanide (HCN), which affects cellular respiration and siderophore production, leads to iron chelation, and limits iron accessibility to pathogens ( Sayyed et al, 2013 ; Muthukumar et al, 2022 ; Singh et al, 2022 ). Such behavior of beneficial bacteria against host pathogens can suppress diseases in in vitro and in planta ( Ramakrishna et al, 2019 ; Mahmud et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

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Application of data integration for rice bacterial strain selection by combining their osmotic stress response and plant growth-promoting traits

Devarajan

Truu²,

Gopalasubramaniam³

et al. 2022

Front. Microbiol.

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Agricultural application of plant-beneficial bacteria to improve crop yield and alleviate the stress caused by environmental conditions, pests, and pathogens is gaining popularity. However, before using these bacterial strains in plant experiments, their environmental stress responses and plant health improvement potential should be examined. In this study, we explored the applicability of three unsupervised machine learning-based data integration methods, including principal component analysis (PCA) of concatenated data, multiple co-inertia analysis (MCIA), and multiple kernel learning (MKL), to select osmotic stress-tolerant plant growth-promoting (PGP) bacterial strains isolated from the rice phyllosphere. The studied datasets consisted of direct and indirect PGP activity measurements and osmotic stress responses of eight bacterial strains previously isolated from the phyllosphere of drought-tolerant rice cultivar. The production of phytohormones, such as indole-acetic acid (IAA), gibberellic acid (GA), abscisic acid (ABA), and cytokinin, were used as direct PGP traits, whereas the production of hydrogen cyanide and siderophore and antagonistic activity against the foliar pathogens Pyricularia oryzae and Helminthosporium oryzae were evaluated as measures of indirect PGP activity. The strains were subjected to a range of osmotic stress levels by adding PEG 6000 (0, 11, 21, and 32.6%) to their growth medium. The results of the osmotic stress response experiments showed that all bacterial strains accumulated endogenous proline and glycine betaine (GB) and exhibited an increase in growth, when osmotic stress levels were increased to a specific degree, while the production of IAA and GA considerably decreased. The three applied data integration methods did not provide a similar grouping of the strains. Especially deviant was the ordination of microbial strains based on the PCA of concatenated data. However, all three data integration methods indicated that the strains Bacillus altitudinis PB46 and B. megaterium PB50 shared high similarity in PGP traits and osmotic stress response. Overall, our results indicate that data integration methods complement the single-table data analysis approach and improve the selection process for PGP microbial strains.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of data integration for rice bacterial strain selection by combining their osmotic stress response and plant growth-promoting traits

Devarajan

Truu²,

Gopalasubramaniam³

et al. 2022

Front. Microbiol.

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“…Non-pathogenic Pseudomonas is active in the plant rhizosphere, and belongs to the PGPR (Plant Growthpromoting Rhizobacteria). Pseudomonas can not only promote plant growth by producing active substances or mineral elements, but also inhibits or hinders the development of pathogenic microorganisms in the root zone by producing 10.3389/fmicb.2022.1023826 metabolic substances or via competition (Muthukumar et al, 2022). Studies have shown that Pseudomonas, similar to Bacillus, also has a controlling effect on Xcc.…”

Section: Pseudomonasmentioning

confidence: 99%

Physical, chemical, and biological control of black rot of brassicaceae vegetables: A review

Liu

Wang

et al. 2022

Front. Microbiol.

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As one of the important sources of human nutrition, Brassicaceae vegetables are widely grown worldwide. Black rot caused by Xanthomonas campestris pv. campestris (Xcc) seriously affects the quality and yield of Brassicaceae vegetables. Therefore, it is important to study control methods of Xcc for Brassicaceae vegetable production. This paper reviews the physical, chemical, and biological control methods of Xcc in Brassicaceae vegetables developed in recent years, and the underlying mechanisms of control methods are also discussed. Based on our current knowledge, future research directions for Xcc control are also proposed. This review also provides a reference basis for the control of Xcc in the field cultivation of Brassicaceae vegetables.

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“…and Pseudomonas spp. are known for their utility as plant growth enhancers and biopesticides [30]. Importantly, research has demonstrated that such bacterial consortia manifest unique, emergent properties not attainable by individual species alone [31].…”

Section: Introductionmentioning

confidence: 99%

Evolution of genotypic and phenotypic diversity in multispecies biofilms

Amador,

Moscovitz,

Maccario

et al. 2023

Preprint

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Interactions occurring in microbial communities can affect the fitness and adaptability of their individual members when facing changing environmental conditions. This study investigated the impact of interspecies interactions in selectingBacillus thuringiensisvariants emerging in biofilm and planktonic environments. During evolution experiments, aB. thuringiensisdistinct phenotypic variant ofB. thuringiensisfrequently occurred, despite the presence of other species or culture setup. Remarkably, selection of this variant was significantly favored over its ancestor in biofilm settings and when coexisting with other species co-isolated from a wastewater facility, namelyPseudomonas defluviiandPseudomonas brenneri. Interestingly, the evolved phenotype did not show higher biofilm productivity than its ancestor under any condition, while it was indeed reduced in mixed-species biofilms. Such observation aligned with the reduced abundance of matrix proteins TasA and SpoVG, which are major biofilm matrix components inBacillusspecies, as revealed by matrix proteomics analysis. Furthermore, the variant showed shorter generation time and a lack of sporulation compared to its ancestor, consistent with mutations in key genes for regulating sporulation. Our results indicate that interspecies interactions within biofilms promoteB. thuringiensisdiversification and alter traits such as biofilm matrix production. Despite sporulation being a survival mechanism, this study provides evidence that sporulation does not confer a fitness advantage inin vitrobiofilm environments, even within mixed cultures.

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Pseudomonas and Bacillus: A biological tool for crop protection

Cited by 6 publications

References 73 publications

Application of data integration for rice bacterial strain selection by combining their osmotic stress response and plant growth-promoting traits

Application of data integration for rice bacterial strain selection by combining their osmotic stress response and plant growth-promoting traits

Physical, chemical, and biological control of black rot of brassicaceae vegetables: A review

Evolution of genotypic and phenotypic diversity in multispecies biofilms

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