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KMID : 1160220140420020206
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Mycobiology
2014 Volume.42 No. 2 p.206 ~ p.209
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First Report of Potato Stem-End Rot Caused by Fusarium oxysporum in Korea
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Aktaruzzaman Md.
Xu Sheng-Jun
Kim Joon-Young
Woo Jae-Hyoun
Hahm Young-Il
Kim Byung-Sup
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Abstract
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In this study, we identified the causative agent of stem-end rot in potatoes that were grown in Gangwon alpine areasof Korea in 2013. The disease symptoms included appearance of slightly sunken circular lesion with corky rot on the potatosurface at the stem-end portion. The fungal species isolated from the infected potatoes were grown on potato dextrose agar andproduced white aerial mycelia with dark violet pigments. The conidiophores were branched and monophialidic. Themicroconidia had ellipsoidal to cylindrical shapes and ranged from 2.6~11.4 × 1.9~3.5 μm in size. The macroconidia rangedfrom 12.7~24.7 × 2.7~3.6 μm in size and had slightly curved or fusiform shape with 2 to 5 septate. Chlamydospores rangedfrom 6.1~8.1 × 5.7~8.3 μm in size and were present singly or in pairs. The causal agent of potato stem-end rot was identifiedas Fusarium oxysporum by morphological characterization and by sequencing the internal transcribed spacer (ITS1 and ITS4)regions of rRNA. Artificial inoculation of the pathogen resulted in development of disease symptoms and the re-isolated pathogenshowed characteristics of F. oxysporum. To the best of our knowledge, this is the first study to report that potato stem-end rot iscaused by F. oxysporum in Korea.
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KEYWORD
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Fusarium oxysporum, Pathogenicity, Solanum tubersum, Stem-end rot of potato
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