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Face às escassas informações acerca da variabilidade patogênica de isolados brasileiros de Xanthomonas campestris pv. campestris, realizou-se um estudo para avaliar a especificidade patogênica de trinta e três isolados do patógeno, provenientes de várias regiões do Brasil e do exterior, a oito espécies de brássicas, através de inoculação por meio de injeção da suspensão bacteriana nas folhas. Desse total, 12 isolados foram obtidos de couve-comum (Brassica oleracea var. acephala), nove de repolho (B. oleracea var. capitata), cinco de couve-flor (B. oleracea var. botrytis), dois de canola (B. napus), um de brócolos (B. oleracea var. italica), um de couve-chinesa (B. chinensis), um de couve-rábano (B. oleracea var. gongylodes) e dois de rabanete (Raphanus sativus). A avaliação da patogenicidade dos isolados da bactéria, frente aos hospedeiros em estudo, demonstrou que 14 deles não apresentaram especificidade, originando sintomas em todas as diferentes plantas inoculadas. Os 19 isolados restantes, entretanto, apresentaram relativo grau de especificidade, não causando doença em uma ou mais das plantas inoculadas. Considering the lack of information in literature about the pathogenic variability of Brazilian isolates of Xanthomonas campestris pv. campestris, a study was carried out to determine the pathogenic specificity of 33 isolates of this bacterium originated from several regions of Brazil and overseas to eight different Brassica species, through inoculation by means of injection of the bacterial suspension in leaves. From these isolates, 12 were obtained from collard greens (Brassica oleracea var. acephala), nine from cabbage (B. oleracea var. capitata), five from cauliflower (B. oleracea var. botrytis), two from canola (B. napus), one from broccoli (B. oleracea var. italica), one from Chinese cabbage (B. chinensis), one from kohlrabi (B. oleracea var. gongylodes) and two from radish (Raphanus sativus). The pathogenicity of the bacterium isolates to the tested hosts indicated that 14 of them were not specific and originated symptoms on all inoculated plants. The other 19 isolates had showed relative degrees of specificity and did not cause disease in one or more of the tested brassicas

Especificidade de hospedeiro nas interações Xanthomonas campestris pv. campestris - brássicas