Transmission and modification of transformation markers during an induced parasexual cycle in Penicillium roqueforti

1992 ◽  
Vol 21 (4-5) ◽  
pp. 377-383 ◽  
Author(s):  
Nathalie Durand ◽  
Pascale Reymond ◽  
Michel F�vre
Keyword(s):  
Penicillium Roqueforti ◽  
Parasexual Cycle

Randomly amplified polymorphic DNAs assess recombination following an induced parasexual cycle in Penicillium roqueforti

1993 ◽  
Vol 24 (5) ◽  
pp. 417-420 ◽  
Author(s):  
Nathalie Durand ◽  
Pascale Reymond ◽  
Michel F�vre
Keyword(s):  
Penicillium Roqueforti ◽  
Parasexual Cycle

Bioactive sesterterpenoids from the fungus Penicillium roqueforti YJ-14

2021 ◽  
Vol 187 ◽  
pp. 112762
Author(s):  
Jia-Peng Wang ◽  
Yan Shu ◽  
Rui Liu ◽  
Jun-Li Gan ◽  
Si-Ping Deng ◽  
...  
Keyword(s):  
Penicillium Roqueforti

Production of fermented solid containing lipases from Penicillium roqueforti ATCC 10110 and its direct employment in organic medium in ethyl‐oleate synthesis

2021 ◽  
Author(s):  
Glêydison Amarante Soares ◽  
Robson Carlos Alnoch ◽  
Glauco Silva Dias ◽  
Nadabe dos Santos Reis ◽  
Iasnaia Maria de Carvalho Tavares ◽  
...  
Keyword(s):  
Ethyl Oleate ◽  
Organic Medium ◽  
Penicillium Roqueforti

scholarly journals Parasexuality and Ploidy Change in Candida tropicalis

2013 ◽  
Vol 12 (12) ◽  
pp. 1629-1640 ◽  
Author(s):  
Riyad N. H. Seervai ◽  
Stephen K. Jones ◽  
Matthew P. Hirakawa ◽  
Allison M. Porman ◽  
Richard J. Bennett
Keyword(s):  
Sexual Reproduction ◽  
Candida Tropicalis ◽  
Culture Conditions ◽  
Sexual Cycle ◽  
Chromosome Loss ◽  
Parasexual Cycle ◽  
Content Type ◽  
Ploidy Changes ◽  
Diploid Cells

ABSTRACTCandidaspecies exhibit a variety of ploidy states and modes of sexual reproduction. Most species possess the requisite genes for sexual reproduction, recombination, and meiosis, yet only a few have been reported to undergo a complete sexual cycle including mating and sporulation.Candida albicans, the most studiedCandidaspecies and a prevalent human fungal pathogen, completes its sexual cycle via a parasexual process of concerted chromosome loss rather than a conventional meiosis. In this study, we examine ploidy changes inCandida tropicalis, a closely related species toC. albicansthat was recently revealed to undergo sexual mating.C. tropicalisdiploid cells mate to form tetraploid cells, and we show that these can be induced to undergo chromosome loss to regenerate diploid forms by growth on sorbose medium. The diploid products are themselves mating competent, thereby establishing a parasexual cycle in this species for the first time. Extended incubation (>120 generations) ofC. tropicalistetraploid cells under rich culture conditions also resulted in instability of the tetraploid form and a gradual reduction in ploidy back to the diploid state. The fitness levels ofC. tropicalisdiploid and tetraploid cells were compared, and diploid cells exhibited increased fitness relative to tetraploid cellsin vitro, despite diploid and tetraploid cells having similar doubling times. Collectively, these experiments demonstrate distinct pathways by which a parasexual cycle can occur inC. tropicalisand indicate that nonmeiotic mechanisms drive ploidy changes in this prevalent human pathogen.

Activation of Spores of Penicillium roqueforti

Nature ◽  
1965 ◽  
Vol 208 (5012) ◽  
pp. 801-803 ◽  
Author(s):  
R. C. LAWRENCE
Keyword(s):  
Penicillium Roqueforti

DEMONSTRATION OF A PARASEXUAL CYCLE IN THE ENTOMOPATHOGENIC FUNGUS METARHIZIUM ANISOPLIAE

1980 ◽  
Vol 22 (2) ◽  
pp. 309-314 ◽  
Author(s):  
K. Al-Aidroos
Keyword(s):  
Metarhizium Anisopliae ◽  
Entomopathogenic Fungus ◽  
Parasexual Cycle

In an attempt to demonstrate the existence of a parasexual cycle in the imperfect entomopathogenic fungus, Metarhizium anisopliae (Metschnikoff) Sorokin, doubly- and triply-marked strains were forced to form heterokaryons. All heterokaryons produced diploid spores, two of which yielded putative recombinants.

Roquefortine C Occurrence in Blue Cheese

2001 ◽  
Vol 64 (2) ◽  
pp. 246-251 ◽  
Author(s):  
CARLO FINOLI ◽  
ANGELA VECCHIO ◽  
ANTONIETTA GALLI ◽  
IVAN DRAGONI
Keyword(s):  
Yeast Extract ◽  
Culture Media ◽  
Penicillium Roqueforti ◽  
Blue Cheese ◽  
Penicillium Crustosum ◽  
Sucrose Medium ◽  
Low Toxicity ◽  
Yeast Extract Sucrose ◽  
Roquefortine C

Several strains of Penicillium are used for the production of mold-ripened cheeses, and some of them are able to produce mycotoxins. The aims of the research were the determination of roquefortine C and PR toxin in domestic and imported blue cheeses, the identification of the penicillia used as starter, and the investigation of their capacity for producing toxins in culture media. Roquefortine C was always found in the cheeses at levels ranging from 0.05 to 1.47 mg/kg, whereas the PR toxin was never found. The identification of the fungal strains present in the domestic cheeses included Penicillium glabrum, Penicillium roqueforti, and Penicillium cyclopium in the Gorgonzola “dolce” and Penicillium roqueforti in the Gorgonzola “naturale”; in one case, the presence of Penicillium crustosum was observed. The strains isolated from the foreign cheeses belonged to P. roqueforti. The strains were able to produce between 0.18 and 8.44 mg/liter of roquefortine in yeast extract sucrose medium and between 0.06 and 3.08 mg/liter and less than 0.05 mg/liter when inoculated in milk at 20°C for 14 days and 4°C for 24 days, respectively. Linear relations between production of roquefortine in culture media and cheeses did not emerge. PR toxin ranged from less than 0.05 to 60.30 mg/liter in yeast extract sucrose medium and was produced in milk at 20°C from only one strain. The low levels and the relatively low toxicity of roquefortine make the consumption of blue cheese safe for the consumer.

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