Plant pathogenic Xanthomonas species attack a wide range of agriculture crops and is capable of surviving on weeds. In this study, Xanthomonas strains obtained from weeds grown withing vegetable crop fields in the state of Pernambuco, Northeast Brazil, were identified. Bacterial colonies resembling Xanthomonas were obtained from Aeollanthus suaveolens (strain CCRMXe03), Amaranthus lividus (CCRMXe01 and CCRMXe02), Sida glomerata (CCRMXe04), and Emilia fosbergii (CCRMXe04). All weeds but E. fosbergii exhibited lesions on the leaves. Phylogenetic analysis of the gyrB and rpoD genes and PCR-specific assays allowed to identify X. euvesicatoria pv. euvesicatoria (CCRMXe01, CCRMXe02, CCRMXe03, and CCRMXe04) and X. campestris pv. campestris (CCRMXcc371). All strains but CCRMXe03 were pathogenic to its host of origin. All X. euvesicatoria pv. euvesicatoria strains were pathogenic to leaves and fruits of tomato and bell pepper. Two strains, CCRMXe03 and CCRMXe04, were capable of inducing soft rot in fruits. Amylolytic activity was found in all strains and two strains (CCRMXe03 and CCRMXe04) degraded pectate. Strain CCRMXcc371 was pathogenic to cabbage, kale, cauliflower, and broccoli. This work provides new knowledge of hosts for two important plant pathogenic bacteria for vegetable crops.

中文翻译：

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杂草作为 Xanthomonas euvesicatoria pv 的替代宿主。euvesicatoria 和 X. campestris pv。巴西伯南布哥州蔬菜田中的油菜

植物病原性黄单胞菌属物种攻击范围广泛的农作物并且能够在杂草上存活。在这项研究中，鉴定了从巴西东北部伯南布哥州蔬菜作物田中种植的杂草中获得的黄单胞菌菌株。从 Aeollanthus suaveolens（CCRMXe03 株）、Amaranthus lividus（CCRMXe01 和 CCRMXe02）、Sida glomerata (CCRMXe04) 和 Emilia fosbergii (CCRMXe04) 中获得类似于黄单胞菌的细菌菌落。除 E. fosbergii 外的所有杂草在叶子上都表现出病变。gyrB 和 rpoD 基因的系统发育分析和 PCR 特异性检测允许识别 X.euvesicatoria pv。euvesicatoria（CCRMXe01、CCRMXe02、CCRMXe03 和 CCRMXe04）和 X. campestris pv。油菜 (CCRMXcc371)。除 CCRMXe03 外的所有菌株对其来源宿主均具有致病性。所有 X.euvesicatoria pv。euvesicatoria 菌株对番茄和甜椒的叶子和果实具有致病性。两个菌株，CCRMXe03 和 CCRMXe04，能够诱导果实软腐病。在所有菌株中都发现了淀粉分解活性，两个菌株（CCRMXe03 和 CCRMXe04）降解了果胶。菌株 CCRMXcc371 对卷心菜、羽衣甘蓝、花椰菜和西兰花具有致病性。这项工作为蔬菜作物的两种重要植物病原菌提供了宿主的新知识。