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首页> 外文期刊>Acta Horticulturae >Molecular epidemiology of Xanthomonas campestris pv. musacearum, the causal agent of Xanthomonas wilt of banana and enset.
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Molecular epidemiology of Xanthomonas campestris pv. musacearum, the causal agent of Xanthomonas wilt of banana and enset.

机译：Xanthomonas campestris pv的分子流行病学。 musacearum，香蕉和环境病的黄单胞菌枯萎病的病原体。

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摘要

Xanthomonas wilt of enset and banana was first described in Ethiopia in 1968 and is now a serious disease that is spreading in East and Central Africa. Earlier studies identified Xanthomonas campestris pv. musacearum as the causal agent. This paper describes the characterisation of strains of the bacterium that were isolated in four countries between 1968 and 2006. Phylogenetic analysis of partial nucleotide (nt) sequences of the gyrase B gene and internal transcribed spacer (ITS) region, and genomic amplicon fingerprints using repetitive sequence PCR and fatty acid methyl esters, showed that all strains of the pathogen belonged to the same genotype. Twenty strains originating from Ethiopia, Uganda, the Democratic Republic of Congo and Rwanda had nt sequence identities above 98%. When compared to other species of bacteria, the pathogen was not found to be related to X. campestris, but to X. vasicola, a species that contains X. vasicola pv. holcicola, a sorghum pathogen. Further, a group of sugarcane and maize pathogens that had been classified as X. axonopodis pv. vasculorum, but which were atypical of the species and had been proposed for reclassification as X. vasicola pv. vasculorum, were found to be most similar to the banana and enset strains. The results support the reclassification of X. campestris pv. musacearum as X. vasicola pv. musacearum. In addition, the data reveal that the recent occurrence of Xanthomonas wilt in Uganda and other East African countries is a consequence of the spread of the pathovar first recognised on enset in Ethiopia. Possible hypotheses to explain evolutionary pathways of the three strains of Xanthomonas that affect enset, banana, sorghum, sugarcane and maize are proposed.
机译：沙门氏菌枯萎病和香蕉枯萎病最早于1968年在埃塞俄比亚出现，现在已成为一种严重疾病，并在东部和中部非洲传播。较早的研究确定了Xanthomonas campestris pv。 musacearum作为病因。本文介绍了在1968年至2006年间在四个国家/地区分离的细菌的特性。回旋酶B基因和内部转录间隔区（ITS）区域的部分核苷酸（nt）序列的系统发生分析，以及使用重复性基因组扩增子指纹图谱序列PCR和脂肪酸甲酯表明，该病原菌的所有菌株均属于同一基因型。来自埃塞俄比亚，乌干达，刚果民主共和国和卢旺达的20株菌株的nt序列同一性在98％以上。与其他细菌种类相比，该病原体未发现与樟脑耶氏杆菌有关，而与含有瓦希可氏菌PV的瓦希可拉菌有关。 holcicola，一种高粱病原体。此外，已被分类为X. axonopodis pv的一组甘蔗和玉米病原体。 vasculorum，但不是典型的物种，并已被提议重新分类为X. vasicola pv。人们发现维管束与香蕉和肠炎菌株最相似。结果支持X. campestris pv的重新分类。 musacearum as X. vasicola pv。 musacearum。此外，数据表明，乌干达和其他东非国家最近发生黄单胞菌枯萎病是埃塞俄比亚在发病时首先认识到的病原菌传播的结果。提出了可能的假说来解释这三种影响花序，香蕉，高粱，甘蔗和玉米的黄单胞菌的进化途径。

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