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• W3149763403 abstract "Onion (Allium cepa L.) is one of the important vegetables in Japan. In the summer of 2019, onions with soft rot were found in commercial fields in Hokkaido, the northern island in Japan. Diseased onion showed chlorosis, maceration of leaves, and rotted bulbs. We sampled some diseased onions and isolated three independent isolations (NAONI191, NAONI192 and NAONI193) from infected bulbs on LB medium. These strains were identified as Pectobacterium wasabiae based on their inability to grow at 37°C, and their ability to utilize raffinose and lactose. These bacterial strains were gram-negative, rod-shaped, N-acetylglucosaminyl transferase, gelatin liquefaction. The bacterium was positive for O-nitrophenyl-beta-D-galactopyranoside, N-acetylglucosaminyl transferase, gelatin liquefaction, and acid production from D-galactose, lactose, melibiose, raffinose, citrate, and trehalose. The bacterium was negative for indole production and acid production from maltose, α-methyl-D-glucoside, sorbitol, D-arabitol, inositol, inulin, and melezitose. All the strains exhibited pectolytic activity on potato slices. DNA from these strains yielded a single size amplicon with the primer set of PhF/PhR for P. wasabiae (De Boer et al. 2012) by PCR. However, DNA from these strains did not yield the expected amplicon with the primer set of BR1f/L1r for P. carotovorum subsp. brasiliense (Duarte et al. 2004) and Eca1f/Eca2r for P. atrosepticum (De Boer et al., 1995) by PCR. The sequence analysis of 16S rDNA (LC597917- LC597919) showed more than 98% identities to P. wasabiae strains (e.g. HAFL01 in Switzerland) by BLAST analysis. In addition, Multi-locus sequence analysis (Ma et al. 2007) was performed by MEGA6.06 using concatenated DNA sequences of seven housekeeping genes (aconitate hydratase(acnA, LC597925- LC597927), glyceraldehyde-3-phosphate dehydrogenase A(gapA, LC597972-LC597974), isocitrate dehydrogenase (icdA, LC597998- LC597998LC598000), malate dehydrogenase(mdh, LC598024- LC598026), mannitol-1-phosphate dehydrogenase (mtlD, LC598050- LC598052), glucose-6-phosphate isomerase (pgi, LC598076- LC598078) and gamma-glutamyl phospate reductase (proA, LC598099- LC598101)), and all clustered into a clade containing other confirmed strains of P. wasabiae. As a result, these three strains shared high identity with each other (>98%, E-Values showed 0). The clade containing these three strains was consistently placed in a larger clade with the other P. wasabiae and 100% bootstrap support for its separation from other Pectobacterium species available in GenBank when the consensus tree constructed using Maximum Likelihood method. Pathogenicity of these strains against onion (cv. ‘Hayate’) was confirmed by the field experiments with 5 weeks growth plants sprayed with bacterial suspension (1×107cfu/ml) resulting in soft rot on the plants about four weeks after inoculation, whereas water-inoculated plants remained symptomless. Strains re-isolated from the artificially diseased stems were confirmed as P. wasabiae using the methods as biochemical characterization and multiple genetic analyses. Based on the disease symptoms, the cultural, molecular, and pathological features of the strains, we conclude that the soft rot symptoms of onion in Hokkaido in 2019 were caused by P. wasabiae. To our knowledge, this is the first report of P. wasabiae as the soft rot disease agent of onion in Japan." @default.
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• W3149763403 date "2021-03-29" @default.
• W3149763403 modified "2023-09-26" @default.
• W3149763403 title "First report of soft rot of onion caused by Pectobacterium wasabiae in Japan" @default.
• W3149763403 doi "https://doi.org/10.1094/pdis-01-21-0082-pdn" @default.
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