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Identification of differentially expressed genes associated with changes in the morphology of Pichia fermentans on apple and peach fruit

Fiori, Stefano and Scherm, Barbara and Liu, Jia and Farrel, Robert and Mannazzu, Ilaria Maria and Budroni, Marilena and Maserti, Bianca Elena and Wisniewski, Michael E. and Migheli, Quirico (2012) Identification of differentially expressed genes associated with changes in the morphology of Pichia fermentans on apple and peach fruit. FEMS Yeast Research, Vol. 12 (7), p. 785-795. eISSN 1567-1356. Article.

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DOI: 10.1111/j.1567-1364.2012.00829.x

Abstract

Pichia fermentans (strain DISAABA 726) is an effective biocontrol agent against Monilinia fructicola and Botrytis cinerea when inoculated in artificially wounded apple fruit but is an aggressive pathogen when inoculated on wounded peach fruit, causing severe fruit decay. Pichia fermentans grows as budding yeast on apple tissue and exhibits pseudohyphal growth on peach tissue, suggesting that dimorphism may be associated with pathogenicity. Two complementary suppressive subtractive hybridization (SSH) strategies, that is, rapid subtraction hybridization (RaSH) and PCR-based subtraction, were performed to identify genes differentially expressed by P. fermentans after 24-h growth on apple vs. peach fruit. Gene products that were more highly expressed on peach than on apple tissue, or vice versa, were sequenced and compared with available yeast genome sequence databases. Several of the genes more highly expressed, when P. fermentans was grown on peach, were related to stress response, glycolysis, amino acid metabolism, and alcoholic fermentation but surprisingly not to cell wall degrading enzymes such as pectinases or cellulases. The dual activity of P. fermentans as both a biocontrol agent and a pathogen emphasizes the need for a thorough risk analysis of potential antagonists to avoid unpredictable results that could negatively impact the safe use of postharvest biocontrol strategies.

Item Type:Article
ID Code:8085
Status:Published
Refereed:Yes
Uncontrolled Keywords:Biocontrol, subtractive hybridization, yeast pathogenicity, postharvest, environmental risk, morphogenesis
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 > 02 Centri > Centro di eccellenza interdisc. sviluppo ricerca biotecnologica e studio biodiversità della Sardegna e dell'area mediterranea
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Blackwell / Wiley
eISSN:1567-1356
Copyright Holders:© 2012 Federation of European Microbiological Societies
Deposited On:23 Oct 2012 12:40

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