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http://dx.doi.org/10.5423/PPJ.2002.18.4.199

Soft Rot of Onion Bulbs Caused by Pseudomonas marginalis Under Low Temperature Storage  

Kim, Yong-Ki (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Lee, Seung-Don (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Park, Chung-Sik (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Lee, Sang-Bum (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Lee, Sang-Yeob (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Publication Information
The Plant Pathology Journal / v.18, no.4, 2002 , pp. 199-203 More about this Journal
Abstract
Soft rot occurred severely in onion bulbs stored under low temperature ($5^{\circ}C$) in storage houses at Changyoung, Kyungnam province, Korea in early 2000. Water-soaking and yellowish-brown lesions initially appeared on the outside scales of diseased onion bulbs, gradually progressing into the inside scales. Among the bacterial isolates obtained from the lesions, K-2 isolate was found to be responsible for the disease, which grew at a temperature range of from $0^{\circ}C$ to $36^{\circ}C$ with optimum temperature of $00^{\circ}$-$33^{\circ}C$. However, it showed strong pathogenicity to onion bulbs at $25^{\circ}C$ and $5^{\circ}C$ at 3 days and 2 months, respectively. The bacterium also caused soft rot on potato and showed hypersensitive reactions to tobacco and potato. The causal bacterium of onion soft rot was identified as Pseudomonas marginalis based on morphological, biochemical, and physiological characteristics including LOPAT, Soft rot in onion under low temperature storage caused by P. marginalis has not been previously reported.
Keywords
low temperature; onion; Pseudomonas marginalis; soft rot;
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