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Diversity of Pectobacterium spp. Isolated from Potato (Solanum tuberosum L.) on South Korea.

Samnyu Jee: Rural development administration

<div>During 15 years, <em>Pectobacterium</em> species has been changed in classification and new species were suggested. <em>Pectobacterium carotovorum</em> subsp. <em>carotovorum</em> (Pcc) had been studied as main soft rot pathogen in South Korea. We tried to know diversity of soft rot pathogens which are distributed in South Korea with new criteria. Including former collection, 235 strain were collected from potato cultivation area during 2 years, 2016-2017. Checked pathogenicity on potato slice, all collection were cultivated on crystal violet pectate (CVP) medium in three temperature. This collection were classified by 16s rDNA sequence and rec A sequence. Isolated from potato, strains showed stronger pectinase activity and better tolerance in high temperature than others which were isolated from Kimchi cabbage and radish<em>. Dickeya</em> genus and <em>Pectobacterium</em> species except<em> Pectobacterium carotovorum</em> (Pc) subspecies were not identified in this collection. Pc subspecies were main pathogen of potato soft rot in South Korea. Pcc constitutes 47% of the collection, and <em>Pectobacterium carotovorum</em> subsp. <em>brasiliense</em> (Pcb) were 27%. We suggest that Clade I is able to be new Pc subspecies.</div>