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http://dx.doi.org/10.5423/RPD.2007.13.1.066

Bacterial Leaf Spot and Dry Rot of Lettuce Caused by Xanthomonas campestris pv. vitians  

Lee, Seung-Don (Plant Pathology Division, National Institute of Agricultural Science and Technology)
Lee, Jung-Hee (Plant Pathology Division, National Institute of Agricultural Science and Technology)
Kim, Yong-Ki (Plant Pathology Division, National Institute of Agricultural Science and Technology)
Heu, Sung-Gi (Plant Pathology Division, National Institute of Agricultural Science and Technology)
Ra, Dong-Soo (Plant Pathology Division, National Institute of Agricultural Science and Technology)
Publication Information
Research in Plant Disease / v.13, no.1, 2007 , pp. 66-70 More about this Journal
Abstract
During 1997 and 1998, a new disease of lettuce (Lactuca sativa) was observed on greenhouse-grown plants in Kwangju and Kwangmyung. Lesions on leaves were irregular, small, pale green to black, water-soaked, and 2 to 5 mm in diameter, Coalescing lesions sometimes caused defoliation of older leaves. Isolations made from diseased leaves on yeast extract dextrose calcium carbonate agar yielded nearly pure cultures of a yellow pigmented bacterium typical of a xanthomonad. Two bacterial strains (SL0246 and SL1352) were purified and used for further tests. Pathogenicity of strains was confirmed on 5-week-old lettuce plants injected with bacterial suspensions containing $10^8$ cfu/ml of phosphate buffered saline. The representative Xanthomonas strains isolated from lettuce were compared with a reference strain X. campestris pv, vitians for fatty acid profiles and metabolic fingerprints using GN2 microplate, showing that all outcomes were indistinguishable between the representative and reference strains. This is the first report of bacterial leaf spot and dry rot of lettuce in Korea.
Keywords
Bacterial leaf spot; Lactuca sativa; Xanthomonas campestris pv. vitians;
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