THE DISEASE Black rot was first described by Garman (1894) as a disease of cabbage in Kentucky, USA. He isolated two types of bacteria from diseased plants, but could not determine which type of bacterium was causing the disease. In Iowa, USA, Pammel (1895a, b) observed a similar disease in rutabaga and turnip, and showed that the disease was caused by a bacterium (named Bacillus campestris) with yellow pigmented colonies in culture. Reports from Wisconsin also attributed the disease of turnips and cabbage to the yellow bacterium (Russell, 1898; Smith, 1898). Since then, the disease has been identified in all continents wherever Brassicaceae crops are grown (Bradbury, 1986), and is considered to be the most important disease of vegetable brassica crops worldwide (Williams, 1980). Brassica oleracea (including cabbage, cauliflower, broccoli, Brussels sprouts and kale) is economically the most important host of Xcc. However, the disease also occurs in other brassica crops, radish, ornamental crucifers and related weed species (Bradbury, 1986). Some accessions of Arabidopsis thaliana, the model plant for molecular plant research, are also susceptible when inoculated with Xcc. LIFE
Posted on: Tue, 01 Oct 2013 18:14:58 +0000
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