Eight collections from different localities in the northern provinces of Iran were obtained during spring-summer 2010–11. Seven species on eight host plants were identified: Cercospora pantoleuca on Plantago lanceolata, Cercosporella primulae on Primula
macrocalyx, C. virgaureae on Conyza bonariensis, Passalora bondartsevii on Medicago sp., Pseudocercospora danaicola on Danae racemosa, P. paraguayensis on Eucalyptus camaldulensis, and Scolecostigmina confluens on Crataegus
melanocarpa and C. pseudomelanocarpa. These taxa are new records to Iran. Cercosporina danaicola is recombined as Pseudocercospora danaicola.
Aims
This study aimed to evaluate the effects of three Bacillus probiotics on Salmonella Typhimurium, and interleukin‐8 (IL‐8) gene expression in the co‐culture of the Bacillus and the pathogen in vitro.
Methods and Results
Bacillus subtilis, Bacillus indicus and Bacillus coagulans were initially turned to spore and heat‐inactivated forms. The cellular damages of the probiotics on the HT‐29 cells were investigated individually and in combination with S. Typhimurium using 3‐(4,5 dimethylthiazol‐2‐yl)‐2,5‐diphenyl tetrazolium bromide (MTT) and fluorescence assays. To extract cell free supernatants (CFS) of the probiotics, they were cultured in selective media. The inhibitory activity of CFSs were then assayed against the pathogen. The gene expression of IL‐8 of the HT‐29 cells was evaluated by real‐time PCR in all the groups. The results showed that the CFSs of three probiotics could inhibit the growth of S. Typhimurium by more than 50%. Inhibitory effects of B. indicus and B. subtilis CFSs were related to the production of pepsin‐sensitive compounds, except B. coagulans in which the high inhibitory effect was due to organic acids. The spores of the three probiotics and the heat‐inactivated forms of B. subtilis and B. coagulans could reduce the cytotoxicity of S. Typhimurium. The cell viability also increased applying both forms probiotics against the pathogen. In all co‐culture groups, the IL‐8 gene expression induced by S. Typhimurium was reduced.
Conclusions
The three Bacillus probiotics can be considered as proper candidates for the prevention and treatment of S. Typhimurium food poisoning.
Significance and Impact of the Study
Applying probiotics as live bacteria is universally noted in foods. This study tried to discover the effects of Bacillus probiotics in the form of spore or even heat‐killed bacteria against S. Typhimurium and evaluate ratio of IL‐8 gene expression in cell culture. The most effective Bacillus probiotic will be recommended. This approach will help to use probiotics as nonvegetative cells in foods to fight gastrointestinal pathogens.
Comprehensive up to date information of cercosporoid and ramularioid species of Iran is given with their hosts, geographical distribution and references. A total of 186 taxa belonging to 24 genara are listed. Among them, 134 taxa were belonged to 16 Cercospora and Cercospora-like genera viz. Cercospora (62 species), Cercosporidium (1 species), Clypeosphaerella (1 species), Fulvia (1 species), Graminopassalora (1 species), Neocercospora (1 species), Neocercosporidium (1 species), Nothopassalora (1 species), Paracercosporidium (1 species), Passalora (21 species), Pseudocercospora (36 species), Rosisphaerella (1 species), Scolecostigmina (2 species), Sirosporium (2 species), Sultanimyces (1 species) and Zasmidium (1 species); and 52 taxa were belonged to 8 Ramularia and Ramularia-like genera viz. Cercosporella (2 species), Microcyclosporella (1 species), Neoovularia (2 species), Neopseudocercosporella (1 species), Neoramularia (2 species), Ramularia (42 species), Ramulariopsis (1 species) and Ramulispora (1 species). Key words -anamorphic fungi -biodiversity -Cercospora-like genera -Ramularia-like generawest of Asia
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