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首页> 外文期刊>African Journal of Biotechnology >Xanthomonads and other yellow-pigmented Xanthomonas-like bacteria associated with tomato seeds in Tanzania
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Xanthomonads and other yellow-pigmented Xanthomonas-like bacteria associated with tomato seeds in Tanzania

机译：坦桑尼亚与番茄种子相关的黄单胞菌和其他黄色色素类黄单胞菌

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Tomato (Solanum lycopersicum?L.) seeds habour unique bacterial community that can be pathogenic or beneficial to their host.?Xanthomonas?causing bacterial leaf spot (BLSX) on tomato and other yellow-pigmented xanthomonads-like bacteria (XLB) that closely resemble BLSX were obtained from tomato seeds collected from Northern, Central and Southern highland regions of Tanzania. A total of 73 strains were isolated from 52 seed samples of 15 tomato cultivars. Results obtained with Biolog and sequence analysis of the 16S rRNA gene showed that samples originating from Central Tanzania harbored the most diverse populations of XLB and BLSX as compared to Northern and Southern Tanzania. The predominant bacterial genera in tomato seeds were?Stenotrophomonas,?Sphingomonas,?Chryseobacterium,Xanthomonas,?Pantoea?and?Flavobacterium. All strains identified by Biolog asXanthomonas?with exception of?Xanthomonas campestris?pv.?malvacearum, were pathogenic on tomato and pepper plants. Strains identified by Biolog asSphingomonas sanguinis?and?Sphingomonas terrae?also?incited black rot symptoms on pepper leaves. However, bacterial strains belonging to the genusStenotrophomonas,?Chryseobacterium,?Pantoea?and?Flavobacterium?were not pathogenic on tomato and pepper. Phylogenetic analysis showed that strains of the genus?Xanthomonas?are more closely related to?Stenotrophomonas?and?Pantoeacompared to the other bacterial genera found in tomato seeds.
机译：番茄（Solanum lycopersicum？L。）种子具有独特的细菌群落，可以致病或有益于宿主。•番茄黄单胞菌-导致番茄上的细菌叶斑（BLSX）和其他类似黄色色素的黄单胞菌样细菌（XLB）。 BLSX从收集自坦桑尼亚北部，中部和南部高原地区的番茄种子中获得。从15个番茄品种的52个种子样品中总共分离出73个菌株。通过Biolog和16S rRNA基因的序列分析获得的结果表明，与坦桑尼亚北部和南部相比，源自坦桑尼亚中部的样品具有最多的XLB和BLSX种群。番茄种子中主要的细菌属是：单核嗜单胞菌，鞘氨醇单胞菌，嗜热杆菌属，黄单胞菌，潘托亚氏菌和黄杆菌。由Biolog鉴定为黄单胞菌的所有菌株，除了“番茄黄单胞菌” p.v.“锦葵”以外，均对番茄和辣椒植物具有致病性。由Biolog鉴定为血吸毒单胞菌和地漏吸毒单胞菌的菌株也诱发了辣椒叶上的黑腐病症状。但是，属于嗜麦芽单胞菌属，嗜热杆菌属，潘多亚菌和黄杆菌属的细菌菌株对番茄和辣椒没有致病性。系统发育分析表明，与番茄种子中发现的其他细菌属相比，黄单胞菌属的菌株与单核嗜单胞菌和潘托菌的亲缘关系更密切。

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