Impact of solid medium composition on the conidiation in Penicillium camemberti

Conidiation of an industrial strain of Penicillium ( P.) camemberti, a ripening fungus, was examined on solid media. In order to evaluate the influence of nutritional factors on conidiation, we developed an inoculation and transfer procedure that allowed to obtain an homogenous mycelial biomass. Abs...

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Bibliographic Details
Published in:Process biochemistry (1991) 2006-06, Vol.41 (6), p.1318-1324
Main Authors: Krasniewski, Isabelle, Molimard, Pascal, Feron, Gilles, Vergoignan, Catherine, Durand, Alain, Cavin, Jean-François, Cotton, Pascale
Format: Article
Language:English
Subjects:
Biochemistry, Molecular Biology
C/N ratio
Calcium
Conidiation
Life Sciences
Nitrate
Penicillium camemberti
Solid media
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Summary:Conidiation of an industrial strain of Penicillium ( P.) camemberti, a ripening fungus, was examined on solid media. In order to evaluate the influence of nutritional factors on conidiation, we developed an inoculation and transfer procedure that allowed to obtain an homogenous mycelial biomass. Absence of conidiation was observed when ammonium sulphate and sodium nitrate were used as nitrogen sources. In contrast, conidiation increased significantly in the presence of ammonium phosphate or potassium nitrate with 4.8 × 10 6 and 12 × 10 6 spores ml −1, respectively. By using those optimal conditions, the influence of nutrient starvation or calcium supply on conidiation was studied. Under the conditions tested, nitrogen starvation and calcium supply were better inducers than carbon starvation. A high carbon-to-nitrogen (C/N) ratio provided the highest level of with 4.2 × 10 7 spores ml −1 and a sporulation index of 8.2 after 16 days of cultivation.
ISSN:1359-5113
1873-3298
DOI:10.1016/j.procbio.2006.01.005