Pathogenic Variability in Isolates of Xanthomonas campestris pv. glycines
1998
Hwang Ingyu Plant Protectants R.U., Korea Research Institute of Bioscience and Biotechnology, KIST, Taejon 305-600 (Korea Republic) Lim S. M. Department of Plant Pathology, University of Arkansas, Feyetteville, AR 72701 USA
Sixty three isolates of Xanthomonas campestris pv. glycines obtained from six states in the United States and the National Collection of Plant Pathogenic Bacteria in England (NCPPB) were evaluated for their pathogenic variability on 11 soybean cultivars which represented a broad base of genotypes. From the initial greenhouse experiment, nine isolates repersenting sixty three isolates were chosen for field tests. The experiments were done in the field in 1987, 1988, and 1989 by inoculating the cultivars with individual isolates. Reactions of 11 cultivars to five of the nine isolates (8602, S-9-4, 8ra, xp 144, 1717) were identical. Williams, which has the gene rxp for resistance to X. cmapestris pv. glycines, was resistant to eight isolates. One of the four isolates (8601) was virulent on Williams which developed typical symptoms of bacterial pustule. This is the first report of an isolate of X. campestris pv. glycines virulent on a soybean cultivar with the gene rxp for bacterial pustule resistance. Reactions of the cultivars to the other four isolates were different, and the results were consistent in all experiments. Interestingly, isolate LA1 produced symptoms only on Pella and Ware and did not cause any symptoms on the other nine cultivars. Manchu and Williams were resistant to isolate xp29 and Williams, Harosoy, Mukden, Manchu were resistant to isolate 1124. This indicates that there are pathogenic variabilities of this organism. Based on different reactions of the cultivars, the isolates are classified to races 1, 2, 3, 4, and 5. Five cultivars, Chippewa, Harosoy, Mukden, Pella, and Williams differentiated these five races.
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