In vitro assessment of the antagonistic potential of Bacillus spp. and Pseudomonas spp. against Xanthomonas campestris pv. campestris isolated from winter oilseed rape in Serbia

2020 ◽  
Author(s):  
Aleksandra Jelušić
Keyword(s):  
Oilseed Rape ◽  
Xanthomonas Campestris ◽  
Winter Oilseed Rape ◽  
Pseudomonas Spp ◽  
Bacillus Spp ◽  
Antagonistic Potential ◽  
In Vitro Assessment ◽  
Xanthomonas Campestris Pv Campestris

New insights into the genetic diversity of Xanthomonas campestris pv. campestris isolates from winter oilseed rape in Serbia

2020 ◽  
Vol 70 (1) ◽  
pp. 35-49
Author(s):  
Aleksandra Jelušić ◽  
Tanja Berić ◽  
Petar Mitrović ◽  
Ivica Dimkić ◽  
Slaviša Stanković ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Oilseed Rape ◽  
Xanthomonas Campestris ◽  
Winter Oilseed Rape ◽  
Xanthomonas Campestris Pv Campestris

scholarly journals Antagonism of Bacillus spp. against Xanthomonas campestris pv. campestris

2005 ◽  
Vol 48 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Leila Monteiro ◽  
Rosa de Lima Ramos Mariano ◽  
Ana Maria Souto-Maior
Keyword(s):  
Growth Phase ◽  
Xanthomonas Campestris ◽  
Black Rot ◽  
Bacillus Spp ◽  
Surfactant Activity ◽  
Xanthomonas Campestris Pv Campestris ◽  
Late Growth

The antagonism of eight Bacillus isolates was investigated against nine strains of Xanthomonas campestris pv. campestris (causal agent of crucifers black rot) to assess the role of lipopeptides in this process. Antimicrobial and hemolytic (surfactant) activity tests were performed in vitro using agar diffusion methods. Antibiosis and hemolysis were positive for four Bacillus isolates against all X. campestris pv. campestris strains. The correlation observed between antimicrobial and hemolytic activities indicated that lipopeptides were involved in the antibiosis mechanism of the studied antagonists. Fermentation studies were carried out with the isolates that showed highest antimicrobial and hemolytic activities, to follow up growth and production of bioactive and surfactant compounds. Production of bioactive and surfactant compounds was observed during the late growth phase of the Bacillus isolates.

scholarly journals The Iturin-like Lipopeptides Are Essential Components in the Biological Control Arsenal of Bacillus subtilis Against Bacterial Diseases of Cucurbits

2011 ◽  
Vol 24 (12) ◽  
pp. 1540-1552 ◽  
Author(s):  
Houda Zeriouh ◽  
Diego Romero ◽  
Laura García-Gutiérrez ◽  
Francisco M. Cazorla ◽  
Antonio de Vicente ◽  
...  
Keyword(s):  
Biological Control ◽  
Antibacterial Activity ◽  
Bacillus Subtilis ◽  
Xanthomonas Campestris ◽  
Soft Rot ◽  
Bacterial Diseases ◽  
Chromatography Analysis ◽  
Essential Components ◽  
Bacillus Spp

The antibacterial potential of four strains of Bacillus subtilis, UMAF6614, UMAF6619, UMAF6639, and UMAF8561, previously selected on the basis of their antifungal activity and efficacy against cucurbit powdery mildew, was examined. Among these strains, UMAF6614 and UMAF6639 showed the highest antibacterial activity in vitro, especially against Xanthomonas campestris pv. cucurbitae and Pectobacterium carotovorum subsp. carotovorum. These strains produced the three families of lipopeptide antibiotics known in Bacillus spp.: surfactins, iturins, and fengycins. Using thin-layer chromatography analysis and direct bioautography, the antibacterial activity could be associated with iturin lipopeptides. This result was confirmed by mutagenesis analysis using lipopeptide-defective mutants. The antibacterial activity was practically abolished in iturin-deficient mutants, whereas the fengycin mutants retained certain inhibitory capabilities. Analyses by fluorescence and transmission electron microscopy revealed the cytotoxic effect of these compounds at the bacterial plasma membrane level. Finally, biological control assays on detached melon leaves demonstrated the ability of UMAF6614 and UMAF6639 to suppress bacterial leaf spot and soft rot; accordingly, the biocontrol activity was practically abolished in mutants deficient in iturin biosynthesis. Taken together, our results highlight the potential of these B. subtilis strains as biocontrol agents against fungal and bacterial diseases of cucurbits and the versatility of iturins as antifungal and antibacterial compounds.

scholarly journals XpsG, the major pseudopilin in Xanthomonas campestris pv. campestris, forms a pilus-like structure between cytoplasmic and outer membranes

2002 ◽  
Vol 365 (1) ◽  
pp. 205-211 ◽  
Author(s):  
Nien-Tai HU ◽  
Wei-Ming LEU ◽  
Meng-Shiunn LEE ◽  
Avon CHEN ◽  
Shu-Chung CHEN ◽  
...  
Keyword(s):  
Xanthomonas Campestris ◽  
Klebsiella Oxytoca ◽  
Subcellular Fractionation ◽  
Soluble Form ◽  
Wild Type ◽  
Outer Membranes ◽  
Extracellular Milieu ◽  
Large Complex ◽  
Xanthomonas Campestris Pv Campestris

GspG, -H, -I, -J and -K proteins are members of the pseudopilin family. They are the components required for the type II secretion pathway, which translocates proteins across the outer membrane of Gram-negative bacteria to the extracellular milieu. They were predicted to form a pilus-like structure, and this has been shown for PulG of Klebsiella oxytoca by using electron microscopy. In the present study, we performed biochemical analyses of the XpsG protein of Xanthomonas campestris pv. campestris and observed that it is a pillar-like structure spanning the cytoplasmic and outer membranes. Subcellular fractionation revealed a soluble form (SF) of XpsG, in addition to the membrane form. Chromatographic analysis of SF XpsG in the absence of a detergent indicated that it is part of a large complex (>440kDa). In vitro studies indicated that XpsG is prone to aggregate in the absence of a detergent. We isolated and characterized a non-functional mutant defective in forming the large complex. It did not interfere with the function of wild-type XpsG and was not detectable in the SF. Moreover, unlike wild-type XpsG, which was distributed in both the cytoplasmic and outer membranes, it appeared only in the cytoplasmic membrane. When wild-type XpsG was co-expressed with His6-tagged XpsH but not with untagged XpsH, SF XpsG bound to nickel and co-eluted with XpsH. This result suggests the presence of other pseudopilin components in the XpsG-containing large-sized molecules.

scholarly journals Microbiological safety of commonly available eye ointments and their in-vitro anti-bacterial potency

2019 ◽  
Vol 35 (2) ◽  
pp. 122-126
Author(s):  
Mrityunjoy Acharjee ◽  
Rakhi Baishnaib ◽  
Rashed Noor
Keyword(s):  
Microbiological Quality ◽  
Positive Control ◽  
Fungal Contamination ◽  
Zone Diameter ◽  
Pseudomonas Spp ◽  
Cultural Methods ◽  
Bacillus Spp ◽  
Viable Bacteria ◽  
Staphylococcus Spp

Current study attempted to check out the microbiological quality of some common sterile ointment commonly implemented for the treatment of eye infections in Bangladesh. Seventeen (17) different eye ointment (T-Mycin, Aprocin, Bactin, Optimox and Cloram, Hypomer gel, Sonexa, Polytracin, Cero, Aristobet, Lotepred, Herpigel, Gentob, Xoviral, Zirgan, Xovir, Tomycin, Tobirax, AFm-plus and Parafresh) were microbiologically examined through common and traditional cultural methods. Total viable bacterial and fungal contamination was found up to 106 and 105 cfu/ml respectively. Among the 17 samples T-Mycin, Aprocin, Sonexa, Polytracinand Tomycinwere free from fungal contamination. All the samples significantly exceeded United States Pharmacopeia (USP) or British Pharmacopeia (BP) limit (<102 cfu/ml) in case of Total viable bacteria and fungus contamination. While the coliforms (Escherichia coli and Klebsheilla spp.) were absent in all samples, the prevalence of Staphylococcus spp. was 100% in all samples up to 103 while the Bacillus spp. was found up to 102 cfu/ml. Pseudomonas spp. was cultivated in TMycin, Aprocin Hypomer gel, Sonexa, Polytracin, Cero, Aristobet and Lotepred up to 103cfu/ml. All the 5 drugs showed their antibacterial potency with satisfactory range of zone diameter againstE. coli, Pseudomonas spp., Staphylococcus spp., Klebsheilla spp. and Bacillus spp. In case of all 17 ointments the average zone diameter range was noticed within 13mm-22mm. The highest zone diameter (22mm) was recorded against E. coli produced by Aprocin and minimum zone diameter (13mm) was recorded against Bacillus spp. produced by Bactin, Optimox and Cloram.Gentamicin and Streptomycin were used as positive control against the tested bacteria. Bangladesh J Microbiol, Volume 35 Number 2 December 2018, pp 122-126

scholarly journals Antagonistic potential of Bacillus spp. isolates against bacterial pathogens of tomato and fungal pathogen of pepper

2018 ◽  
Vol 33 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Svetlana Milijasevic-Marcic ◽  
Vesna Todorovic ◽  
Olja Stanojevic ◽  
Tanja Beric ◽  
Slavisa Stankovic ◽  
...  
Keyword(s):  
Growth Inhibition ◽  
Inhibition Zone ◽  
Inhibitory Effect ◽  
Antagonistic Effect ◽  
Subtilis Strain ◽  
Vegetable Crops ◽  
Clavibacter Michiganensis Subsp ◽  
Bacillus Spp ◽  
Antagonistic Potential

In vitro antagonistic potential of eleven isolates of Bacillus spp. against two phytopathogenic bacteria and one fungus was tested in order to identify potential biocontrol agents in vegetable crops. The Bacillus spp. isolates demonstrated different levels of antagonistic effect against the tested pathogenic microorganisms. Data in the study proved Xanthomonas vesicatoria to be more sensitive to Bacillus spp. strains than Clavibacter michiganensis subsp. michiganensis. Ten B. subtilis strains induced growth inhibition of X. vesicatoria, while a strain of B. pumilus did not affect the growth of that bacterium. The largest inhibition zones against X. vesicatoria were induced by strains B-319, B-325 and B-358. The pathogenic strain C. michiganensis subsp. michiganensis was most inhibited by two B. subtilis strains (B-338 and B-348) with mean inhibition zone diameters of up to 20 mm. B. subtilis strain B-319 which was the best in inhibiting X. vesicatoria, showed the lowest inhibitory effect on C. michiganensis subsp. michiganensis. The largest growth inhibition percentage of Verticillium sp. (PGI approximately 70%) was induced by B. subtilis strains B-310 and B-322. The other B. subtilis strains showed PGI values ranging from 45% to 68%, while B. pumilus strain B-335 had the least antagonistic potential (PGI =34.43%) against the pathogen. This study identified at least one suitable biocontrol candidate, B. subtilis strain B-358, as effective in vitro against all three vegetable pathogens.

scholarly journals Freezing tolerance and proline content of in vitro selected hydroxyproline resistant winter oilseed rape

2010 ◽  
Vol 46 (No. 1) ◽  
pp. 35-40 ◽  
Author(s):  
A. Janská ◽  
S. Zelenková ◽  
M. Klíma ◽  
M. Vyvadilová ◽  
T.I. Prášil
Keyword(s):  
Oilseed Rape ◽  
Freezing Tolerance ◽  
Doubled Haploid ◽  
In Vitro Selection ◽  
Proline Content ◽  
Response To Selection ◽  
Weak Correlation ◽  
Winter Oilseed Rape ◽  
Selection For

Twelve doubled haploid (DH) winter oilseed rape plants with altered levels of proline and/or freezing tolerance were obtained by in vitro selection for resistance to trans-4-hydroxy-l-proline (Hyp) in five segregating microspore populations. No significant response to selection either in proline content or in freezing tolerance, compared with the non-selected control populations, was observed. When data from all examined materials were combined, a weak correlation between proline content and freezing tolerance was observed.

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