title: Bacterial species associated with sound and Botrytis-infected grapes from a Greek vineyard.
abstract: Grape bacterial microbiota plays central roles in the quality of grapes and wine, yet its diversity remains poorly described. In the present study, bacterial species associated with sound and Botrytis-infected grapes of two cultivars originating from the same vineyard were assessed. Isolates were identified by PCR-Denaturing Gradient Gel Electrophoresis (PCR-DGGE) and sequence analysis of partial 16S rRNA gene. Comparable counts were recorded between Botrytis-infected and sound grape samples. In all cases, the majority of isolates belonged to different species of Enterobacteriaceae. The dominant species in the vineyard was Klebsiella oxytoca that was found in different combinations with Citrobacter freundii, Enterobacter spp., Erwinia sp., Pantoea dispersa, Tatumella ptyseos or other species. In fermenting musts, those populations declined while other species evolved, like Lactobacillus plantarum and Enterobacter ludwigii. Populations in botrytised samples persisted longer during spontaneous fermentations. Present study suggests that bacterial diversity on grapes may be wider than previously described.
authors.affiliation: Laboratory of Microbiology and Biotechnology of Foods, Agricultural University of Athens, Greece.
authors.forename: Aspasia A
authors.initials: AA
authors.lastname: Nisiotou
authors.forename: Kalliopi
authors.initials: K
authors.lastname: Rantsiou
authors.forename: Vassilios
authors.initials: V
authors.lastname: Iliopoulos
authors.forename: Luca
authors.initials: L
authors.lastname: Cocolin
authors.forename: George-John E
authors.initials: GJ
authors.lastname: Nychas
mesh_terms: D020171:Botrytis / Q000472:pathogenicity*; D015169:Colony Count, Microbial; D058645:Denaturing Gradient Gel Electrophoresis; D004755:Enterobacteriaceae / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D005285:Fermentation; D005516:Food Microbiology; D010935:Plant Diseases / Q000382:microbiology; D016133:Polymerase Chain Reaction / Q000379:methods; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D027843:Vitis / Q000382:microbiology*; D014920:Wine / Q000382:microbiology
chemical_list: D012336:RNA, Ribosomal, 16S