Characterization of Pectobacterium carotovorum subsp. carotovorum isolates from a recent outbreak on cabbage in Bosnia and Herzegovina

  • Tatjana Popović Institute for Plant Protection and Environment, Teodora Drajzera 9, Belgrade
  • Aleksandra Jelušić University of Belgrade, Institute for Multidisciplinary Research, Kneza Višeslava 1, Belgrade
  • Sanja Marković University of Belgrade, Institute for Multidisciplinary Research, Kneza Višeslava 1, Belgrade
  • Renata Iličić University of Novi Sad, Faculty of Agriculture, Trg Dositeja Obradovića 8, Novi Sad
Keywords: Pectobacterium; cabbage; identification; characterization

Abstract


The causal agent of soft rot disease associated with a cabbage outbreak in Semberija
region, Bosnia and Herzegovina, in 2018 was identified and characterized. Symptoms appeared
in the form of water-soaked lesions on leaves and specific odour. Disease incidence ranged
from 20% to 30%. The causal pathogen was isolated on nutrient agar (NA), King’s B and
crystal violet pectate (CVP) media. Eight creamy-white, round and convex bacterial isolates,
which produced characteristic pits on CVP medium were taken as representative. They were
gram negative, facultative anaerobe, oxidase negative, catalase positive, nonfluorescent
on King’s B medium, levan and arginine dehydrolase negative. The isolates were able to
cause soft rot on cabbage and potato tuber slices 24 h after inoculation under conditions
of high relative humidity. Polymerase chain reaction (PCR) was performed for preliminary
identification by using three specific primer sets: F0145/E2477 (specific for Pectobacterium
carotovorum subsp. carotovorum), Br1f/L1r (specific for P. carotovorum subsp. brasiliensis) and
ECA1f/ECA2r (specific for P. atrosepticum). All isolates produced the band size of 666 bp with
F0145/E2477 primer pair, indicating that they belong to the species P. carotovorum subsp.
carotovorum. Further genetic characterization was based on sequence analysis of the gapA
and mdh housekeeping genes. BLAST analysis confirmed 99.39% (Q. cover 100%, E. value
0.0) and 100% (Q. cover 100%, E. value 0.0) identity of the isolates with P. carotovorum subsp.
carotovorum strains deposited in the NCBI database as M34 (KY047594) for gapA and Pcc t0437
(KC337296) for mdh genes, respectively. Phylogenetic analysis showed genetic homogeneity
among the cabbage isolates.

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Published
2020/05/02
Section
Original Scientific Paper