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Individuation of the nutritional conditions able to induce dimorphic transition in Pichia fermentans

Sanna, Maria Lina and Migheli, Quirico and Mannazzu, Ilaria Maria and Budroni, Marilena (2009) Individuation of the nutritional conditions able to induce dimorphic transition in Pichia fermentans. Annals of Microbiology, Vol. 59 (Special Issue), p. 77. ISSN 1590-4261. Article.

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DOI: 10.1007/BF03178830

Abstract

The utilization of yeasts as bio-control agents against fruit pathogens may represent an effective alternative to the use of synthetic chemical fungicides. Recently, Giobbe et al. (2007) reported the case of the dimorphic yeast Pichia fermentans that is able to control brown rot caused by Monilia spp. on apple fruits but causes a rapid fruit decay and shows a pathogenic behaviour when tested on peaches. Interestingly, in both cases P. fermentans forms biofilm on fruit surfaces, but this is made of yeast-like cells on apple and pseudo-hyphae on peach fruits. In this context, it seems crucial to understand whether the pathogenic behaviour of P. fermentans is a consequence of pseudohyphal growth and, therefore, if the ability to form pseudo-hyphae is one of the risk factors to be evaluated in view of the utilization of microbial antagonists. In the present work, with the aim of elucidating the mechanisms involved in P. fermentans dimorphic transition, we looked for the nutritional conditions able to induce and separate yeast-like and pseudo-hyphal growth. While on urea-containing medium P. fermentans produces a biofilm made of yeast-like cells, on methionin, as the sole nitrogen source, the biofim consists merely of pseudohyphae. The role of methionin on filamentation will be discussed.

Item Type:Article
ID Code:3835
Status:Published
Refereed:Yes
Uncontrolled Keywords:Monilinia fructicola, Pichia fermentans, biological control, dimorphic transition, biofilm
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Area 07 - Scienze agrarie e veterinarie > AGR/12 Patologia vegetale
Divisions:001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:University of Milan, Department of Food Science and Microbiology
ISSN:1590-4261
Additional Information:Poster presented at The role of Microbiology in Agricultural, Food and Environmental Fields: the 2nd National Conference SIMTREA, Sassari, Italy, June 10-12, 2009.
Deposited On:06 May 2010 09:13

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