Biodiversity of killer activity in yeasts isolated from the Brazilian rain forest

2000 ◽  
Vol 46 (7) ◽  
pp. 607-611 ◽  
Author(s):  
Pietro Buzzini ◽  
Alessandro Martini
Keyword(s):  
Rain Forest ◽  
Debaryomyces Hansenii ◽  
Cryptococcus Laurentii ◽  
Plasmid Curing ◽  
Candida Maltosa ◽  
Killer Activity ◽  
Pseudozyma Antarctica ◽  
Tropical Environments ◽  
Toxin Producers

The occurrence of killer activity against a panel composed of 22 industrially and (or) medically important yeasts was investigated in 438 yeast and yeast-like cultures belonging to 96 species, isolated from different environments of the Brazilian rain forest. Altogether, 26% of ascomycetes, 56% of basidiomycetes, and 42% of yeast-like cultures exhibited killer activity against at least one of the panel yeasts. More than 15 species never reported before as toxin producers were found, with Pseudozyma antarctica, Trichosporon asteroides, and Geotrichum klebahnii, showing the broader activity spectra. Plasmid curing did not cure the killer phenotypes of Candida maltosa, Debaryomyces hansenii, G. klebahnii, Tr. asteroides, Cryptococcus laurentii, and Ps. antarctica.Key words: yeasts, killer activity, tropical environments.

DETERIORAÇÃO DE REFRIGERANTES POR LEVEDURAS

2004 ◽  
Vol 5 (2) ◽  
Author(s):  
C. D. Rocha ◽  
H. J. Schmidt ◽  
C. Monteiro ◽  
E. Odebrecht
Keyword(s):  
Soft Drink ◽  
Debaryomyces Hansenii ◽  
Rhodotorula Glutinis ◽  
Cryptococcus Laurentii ◽  
Rhodotorula Mucilaginosa ◽  
Candida Lipolytica ◽  
Rhodotorula Rubra ◽  
Zygosaccharomyces Bailii ◽  
Candida Sp ◽  
Saccharomycodes Ludwigii

Refrigerantes são bebidas não alcoólicas carbonatadas e constituem ótima fonte de glicídios. A composição química adocicada, o pH menor que 4,3, a aw maior que 0,90 e a atmosfera dos refrigerantes oferece condições favoráveis ao desenvolvimento de diversos microrganimos, incluindo leveduras deteriorantes..A deterioração ocasionada nos refrigerantes não constitui um risco à saúde das pessoas, mas este fenômeno prejudica a imagem de fábricas de refrigerantes, como também pode causar sérias perdas econômicas..Essas perdas podem ser minimizadas com o rastreamento da origem dos focos de contaminação, bem como conhecendo o risco potencial que cada levedura representa para o produto..As leveduras comumente detectadas em bebidas não alcoólicas carbonatadas, são as Brettanomyces sp, Candida lipolytica, Candida sp, Criptococcus albidus, Cryptococcus laurentii, Debaryomyces hansenii, Hanseniaspora sp, Hansenula sp, Kloeckera sp, Kluyveromyces sp, Zygosaccharomyces bailii, Zygosaccharomyces rouxii, Rhodotorula mucilaginosa, Rhodotorula glutinis, Rhodotorula rubra, Pichia sp, Saccharomyces cerevisae, Saccharomyces sp.,Saccharomycodes ludwigii, Schizosaccharomyces sp, e Zygosaccharomyces sp. SOFT DRINK DETERIORATION BY YEASTS Abstract Soft drinks are non alcoholic carbonated beverages that become an excellent source of glycids. Sugar composition, pH lower than 4.3, aw higher than 0.90 and atmosphere of soft drinks are conditions that contribute for the development of many microorganisms, including spoilage yeasts. Soft drink deterioration is not a health risk for people, but this phenomenon damages the beverage companies image and can yield serious economic damages. This problem could be reduced knowing the contamination focus origin, and also understanding the potential risk that each yeast represents to the product. The common yeasts found in nonalcoholic carbonated beverages are Brettanomyces sp, Candida lipolytica, Candida sp, Criptococcus albidus, Cryptococcus laurentii, Debaryomyces hansenii, Hanseniaspora sp, Hansenula sp, Kloeckera sp, Kluyveromyces sp, Zygosaccharomyces bailii, Zygosaccharomyces rouxii, Rhodotorula mucilaginosa, Rhodotorula glutinis, Rhodotorula rubra, Pichia sp, Saccharomyces cerevisae Saccharomyces sp, Saccharomycodes ludwigii, Schizosaccharomyces sp and Zygosaccharomyces sp.

scholarly journals New Cytoplasmic Virus-Like Elements (VLEs) in the Yeast Debaryomyces hansenii

Toxins ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 615
Author(s):  
Xymena Połomska ◽  
Cécile Neuvéglise ◽  
Joanna Zyzak ◽  
Barbara Żarowska ◽  
Serge Casaregola ◽  
...  
Keyword(s):  
Genetic Information ◽  
Yeast Species ◽  
Debaryomyces Hansenii ◽  
Penicillium Roqueforti ◽  
Culture Collections ◽  
Killer Activity ◽  
Killer Toxins ◽  
Genes Encoding ◽  
High Conservation ◽  
Linear Dsdna

Yeasts can have additional genetic information in the form of cytoplasmic linear dsDNA molecules called virus-like elements (VLEs). Some of them encode killer toxins. The aim of this work was to investigate the prevalence of such elements in D. hansenii killer yeast deposited in culture collections as well as in strains freshly isolated from blue cheeses. Possible benefits to the host from harboring such VLEs were analyzed. VLEs occurred frequently among fresh D. hansenii isolates (15/60 strains), as opposed to strains obtained from culture collections (0/75 strains). Eight new different systems were identified: four composed of two elements and four of three elements. Full sequences of three new VLE systems obtained by NGS revealed extremely high conservation among the largest molecules in these systems except for one ORF, probably encoding a protein resembling immunity determinant to killer toxins of VLE origin in other yeast species. ORFs that could be potentially involved in killer activity due to similarity to genes encoding proteins with domains of chitin-binding/digesting and deoxyribonuclease NucA/NucB activity, could be distinguished in smaller molecules. However, the discovered VLEs were not involved in the biocontrol of Yarrowia lipolytica and Penicillium roqueforti present in blue cheeses.

Killer activity of yeasts isolated from the water environment

1995 ◽  
Vol 41 (9) ◽  
pp. 759-766 ◽  
Author(s):  
Renáta Vadkertiová ◽  
Elena Sláviková
Keyword(s):  
Yeast Species ◽  
Water Environment ◽  
Geotrichum Candidum ◽  
Candida Krusei ◽  
Cryptococcus Laurentii ◽  
Cryptococcus Albidus ◽  
Killer Activity ◽  
Hansenula Anomala ◽  
Rhodotorula Species ◽  
Candida Lambica

The killer activity of 46 strains belonging to 12 yeast and yeast-like species isolated from water or sediment samples was studied. Only two strains of the genus Cryptococcus did not show killer activity. Killer activity of yeast-like species Aureobasidium pullulans, Hyphopichia burtonii and Geotrichum candidum, and yeast species Candida krusei and Candida lambica was low. Sporobolomyces salmonicolor, Cryptococcus laurentii and Cryptococcus albidus had better activity against basidiomycetous than ascomycetous species. Hansenula anomala strains showed good activity against Geotrichum candidum strains, Cryptococcus albidus, and Sporobolomyces salmonicolor. Rhodotorula species showed activity against the majority of both ascomycetous and basidiomycetous species.Key words: yeasts, killer activity, sediment and water samples.

scholarly journals Efficiency of Marine Bacteria and Yeasts on the Biocontrol Activity of Pythium ultimum in Ancho-Type Pepper Seedlings

Agronomy ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 408 ◽  
Author(s):  
Liliana Lara-Capistran ◽  
Ramon Zulueta-Rodriguez ◽  
Thelma Castellanos-Cervantes ◽  
Juan J. Reyes-Perez ◽  
Pablo Preciado-Rangel ◽  
...  
Keyword(s):  
Marine Bacteria ◽  
Growth Parameters ◽  
Debaryomyces Hansenii ◽  
Pythium Ultimum ◽  
Cryptococcus Laurentii ◽  
Marine Microorganisms ◽  
Alternative Source ◽  
Pepper Plants

Ancho-type pepper (Capsicum annuum L.) is a crop susceptible to Pythium ultimum, which has already been controlled with synthetic fungicide applications; however, marine antagonist microorganisms could be an alternative source of control. The efficiency in vitro and in vivo of marine bacteria and yeasts was determined against P. ultimum. The inhibition of the radial growth of P. ultimum was quantified in vitro by the bacteria Stenotrophomonas rhizophila KM01 and KM02; Bacillus subtilis RBM01 and RBM02, B. amyloliquefaciens 2RLBF and 3R4CF; and Pseudomonas spp. 2R6BF and 2RE9CF, as well as the yeasts Debaryomyces hansenii 1R11AB, 1R11CB, and LL01 and Cryptococcus laurentii 2R3BF and 2R1CB. The β-1,3-glucanase activity of the marine microorganisms was quantified in the presence of the phytopathogen. The disease index (DI), growth parameters, and colony forming units (CFU) were determined in ancho-type pepper plants inoculated with marine bacteria, yeasts, and P. ultimum. The radial zone of the phytopathogen was inhibited by 80% and 75% by S. rhizophila KM01 and C. laurentii 2R1CB, respectively. D. hansenii LL01 and S. rhizophila KM02 showed the highest activity of β-1,3-glucanase, with 6060 U/mL and 47 U/mL, respectively. B. subtilis RBM02 protected 100% of the plants from the oomycete, and an increase was quantified in all the growth parameters and CFU. The use of these marine bacteria and yeasts are, therefore, an option for P. ultimum biocontrol in ancho-type pepper plants, thereby minimizing the application of synthetic fungicides.

Chemical and biological evaluation of native bamboo species from atlantic rain forest

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
MT Grombone-Guaratini ◽  
LM Brandão Torres ◽  
DA Faria ◽  
CM José
Keyword(s):  
Rain Forest ◽  
Biological Evaluation ◽  
Atlantic Rain Forest ◽  
Bamboo Species
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