Algicidal characteristics of novel algicidal compounds, cyclic lipopeptide surfactins from Bacillus tequilensis strain D8, in eliminating Heterosigma akashiwo blooms

Shao, Xueping; Xie, Wanxin; Liang, Yuhua; Luo, Guiying; Li, Ling; Zheng, Wei; Xu, Qingyan; Xu, Hong

doi:10.3389/fmicb.2022.1066747

Cited by 7 publications

(2 citation statements)

References 49 publications

(64 reference statements)

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“…Besides the potential importance of TTX, Bacillus is known to produce extracellular algicidal compounds against phytoplankton such as cyanobacteria, dinoflagellates and haptophytes of the genus Phaeocystis (e.g. Mayali and Azam 2004 , Guan et al 2014 , Shao et al 2022 ). Variation in bacterial communities may affect DA production by Pseudo-nitzschia (Lelong et al 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Effects of turbulence on diatoms of the genus Pseudo-nitzschia spp. and associated bacteria

Maire,

Schmitt,

Kormas

et al. 2024

FEMS Microbiology Ecology

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Turbulence is one of the least investigated environmental factors impacting the ecophysiology of phytoplankton, both at the community and individual species level. Here, we investigated, for the first time, the effect of a turbulence gradient (${\rm{Reynolds\ number}}$, from ${\rm{R}}{{\rm{e}}}_{\rm{\lambda }} = 0$ to ${\rm{R}}{{\rm{e}}}_{\rm{\lambda }} = 360$) on two species of the marine diatom Pseudo-nitzschia and their associated bacterial communities under laboratory conditions. Cell abundance, domoic acid (DA) production, chain formation, and Chl a content of P. fraudulenta and P. multiseries were higher for intermediate turbulence (${\rm{R}}{{\rm{e}}}_{\rm{\lambda }} = 160$ or $240$). DA was detectable only in P. multiseries samples. These observations were supported by transcriptomic analyses results which suggested the turbulence related induction of the expression of the DA production locus, with a linkage to an increased photosynthetic activity of the total metatranscriptome. This study also highlighted a higher richness of the bacterial community associated with the non-toxic strain of P. fraudulenta in comparison to the toxic strain of P. multiseries. Bacillus was an important genus in P. multiseries cultures (relative abundance 15.5%) and its highest abundances coincided with the highest DA levels. However, associated bacterial communities of both Pseudo-nitzschia species did not show clear patterns relative to turbulence intensity.

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Section: Discussionmentioning

confidence: 99%

Effects of turbulence on diatoms of the genus Pseudo-nitzschia spp. and associated bacteria

Maire,

Schmitt,

Kormas

et al. 2024

FEMS Microbiology Ecology

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“…B. tequilensis was often considered useful in biodegradation and wastewater treatment (Reddy et al, 2014). However, there was inadequate information about the production of biosurfactant from B. tequilensis (Shao et al, 2022). In mainstream databases (such as PubMed, Web of Science, etc.…”

Section: Characterization Of Biosurfactantsmentioning

confidence: 99%

Rapid biosynthesis of biosurfactants by Bacillus tequilensisSL9 isolated from oily sludge: Characterization, optimization, and potential applications

Su,

Wang,

Chen

et al. 2023

J Surfact & Detergents

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The demand of biosurfactants is increasing. It is of great significance to obtain nonpathogenic and high‐yielding microorganisms for the industrial‐scale production of biosurfactants. A biosurfactant‐producing strain SL9 was isolated from oily sludge. It was identified as Bacillus tequilensis based on colonial morphology and 16S rDNA sequence analysis. The biosurfactants produced by strain SL9 was extracted by modified acid precipitation method. A mixture of C12, C13, C14 and C15 surfactin homologues was detected based on HPLC–MS analysis. The optimum production of biosurfactants occurs at pH 7.0 and in the presence of 1.0 g/L NaCl. The optimal carbon source and nitrogen source were 40.0 g/L sucrose and 4.0 g/L NaNO3, respectively. The maximum yield of biosurfactants from strain SL9 was up to 1332.68 mg/L. Interestingly, B. tequilensis SL9 can rapidly synthesize biosurfactants with a yield of 739.36 mg/L in 12 h. The extracted biosurfactants reduced the surface tension of water from 72.1 to 27.5 mN/m with a CMC of 33 mg/L. The biosurfactants can also emulsify paraffin with a EI24 value of 57.58% and keep this good emulsifying activity after 96 h. The produced biosurfactants showed antimicrobial activities against Staphylococcus aureus, Cladosporium sp. and Alternaria sp. with inhibitory rate of 75.67%, 59.07% and 22.91%, respectively. The isolated strain B. tequilensis SL9 can be a nonpathogenic producer for rapid biosynthesis of biosurfactants with a relative high yield. Strain SL9 and its biosurfactant products are promising for application in the oil exploration, bioremediation, agricultural biocontrol, and pharmaceutical industries.

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A potential algicidal bacterium against Spirogyra gracilis blooms: identification, algicidal activity, algicidal mode, and metabolomic profiling

Gu,

Wang,

Cao

et al. 2024

J Appl Phycol

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Algicidal characteristics of novel algicidal compounds, cyclic lipopeptide surfactins from Bacillus tequilensis strain D8, in eliminating Heterosigma akashiwo blooms

Cited by 7 publications

References 49 publications

Effects of turbulence on diatoms of the genus Pseudo-nitzschia spp. and associated bacteria

Effects of turbulence on diatoms of the genus Pseudo-nitzschia spp. and associated bacteria

Rapid biosynthesis of biosurfactants by Bacillus tequilensisSL9 isolated from oily sludge: Characterization, optimization, and potential applications

A potential algicidal bacterium against Spirogyra gracilis blooms: identification, algicidal activity, algicidal mode, and metabolomic profiling

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