Isolation of epiphytic yeasts with potential for biocontrol of Aspergillus carbonarius and A. niger on grape.

Abstract:

:Antagonistic yeasts were isolated from the epiphytic flora associated with grape berries cv. Negroamaro and identified at species level using molecular methods. A total of 144 yeast isolates were tested in a preliminary screening on agar to select isolates showing a killer activity against Aspergillus carbonarius and A. niger, the main species responsible for the accumulation of ochratoxin A in grape. Twenty-eight yeast isolates were selected for their inhibitory effects on the above fungal species and assayed by an in vitro nutritional competition test for their antagonistic capacity towards three selected ochratoxigenic strains. Six yeast isolates belonging to five species, namely 2 isolates of Issatchenkia orientalis and one each of Metschnikowia pulcherrima, Kluyveromyces thermotolerans, Issatchenkia terricola and Candida incommunis, were finally selected and screened on wounded grape berries for their ability to inhibit infection by ochratoxigenic moulds. With the exception of the K. thermotolerans isolate, when inoculated at 10(9) CFU/wound, the other five challenger yeasts reduced the A. carbonarius and A. niger colonization on grape berry (P<0.05). In particular, the best antagonistic activity was shown by the two I. orientalis isolates. Results suggest that antagonist yeasts with the potential to control A. carbonarius and A. niger on grape can be found among the microflora associated with the berries.

journal_name

Int J Food Microbiol

authors

Bleve G,Grieco F,Cozzi G,Logrieco A,Visconti A

doi

10.1016/j.ijfoodmicro.2005.12.004

subject

Has Abstract

pub_date

2006-04-25 00:00:00

pages

204-9

issue

2

eissn

0168-1605

issn

1879-3460

pii

S0168-1605(05)00618-5

journal_volume

108

pub_type

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