Outbreak of Rhizopus Rot Caused by Rhizopus oryzae on Seedlings of Grafted Cucumber on Pumpkin Rootstock in South Korea. Issue 7 (11th August 2014)

• Record Type: Journal Article
• Authors: Kwon, Jin‐Hyeuk; Kang, Dong‐Wan; Lee, Sang‐Dae; Kim, Jinwoo
• Is Part Of: Journal of phytopathology. Volume 163:Issue 7/8(2015:Jul.)
• Page Start: 670
• Page End: 674
• Publication Date: 2014-08-11
• Subjects: Plant diseases -- Periodicals; 632
• DOI: 10.1111/jph.12304
• Languages: English
• ISSNs: 0931-1785

Abstract

<abstract abstract-type="main" id="jph12304-abs-0001"> <title>Abstract</title> <p>In 2013, an outbreak of Rhizopus rot caused by <italic>Rhizopus oryzae</italic> occurred in cucumber grafted onto pumpkin rootstock sampled from seedling farms in Changnyeong, South Korea. A water‐soaked appearance of the affected tissue was the first symptom of this soft fungal rot in the seedling stems of grafted cucumber. Lesions at the graft sites softened and rapidly, rotted, and turned brown or dark brown. Measurements and taxonomic characteristics were most similar to <italic>R. oryzae</italic>. DNA sequencing and phylogenetic analysis of the internal transcribed spacer rRNA gene region confirmed that the isolates were indeed <italic>R. oryzae</italic>. Koch's postulates were supported by pathogenicity tests conducted on healthy plants. Based on mycological characteristics, pathogenicity test, and molecular analysis, the causal fungus was identified as <italic>R. oryzae</italic> Went &amp; Prinsen Geerligs. To our knowledge, this is the first report of Rhizopus rot caused by <italic>R. oryzae</italic> in seedlings of grafted cucumber on pumpkin rootstock in South Korea.</p> </abstract>