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首页> 外文期刊>Plant and Soil >Natural occurrence of Azospirillum brasilense in strawberry plants.
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Natural occurrence of Azospirillum brasilense in strawberry plants.

机译：巴西天生螺旋藻在草莓植物中的天然存在。

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Azospirillum species are free-living nitrogen-fixing bacteria commonly found in soil and in association with roots of different plant species. For their capacity to stimulate growth they are known as plant growth-promoting bacteria (PGPB). In this work, we demonstrate the natural occurrence and colonization of different parts of strawberry plants by Azospirillum brasilense in the cropping area of Tucuman, Argentina. Although bacteria isolations were carried out from two strawberry cultivars, e.g., Camarosa and Pajaro, attempts were successful only with the cultivar Camarosa. Whereas different strains of Azospirillum were isolated from the root surface and inner tissues of roots and stolons of the cultivar Camarosa, we have not obtained Azospirillum isolates from the cultivar Pajaro. After microbiological and molecular characterization (ARDRA) we determined that the isolates belonged to the species A. brasilense. All isolates showed to have the capacity to fix nitrogen, to produce siderophores and indoles. Local isolates exhibited different yields of indoles production when growing in N-free NFb semisolid media supplemented or not with tryptophan (0.1 mg ml-1). This is the first report on the natural occurrence of A. brasilense in strawberry plants, especially colonizing inner tissues of stolons, as well as roots. The local isolates showed three important characteristics within the PGPB group: N2-fixation, siderophores, and indoles production..
机译：固氮螺菌属物种是自由活动的固氮细菌，通常存在于土壤中并与不同植物物种的根相关。由于它们具有刺激生长的能力，因此被称为植物生长促进细菌（PGPB）。在这项工作中，我们证明了巴西固氮螺旋藻在阿根廷图库曼种植区的草莓植株不同部位的自然发生和定殖。尽管从两个草莓品种，例如Camarosa和Pajaro进行了细菌分离，但仅对Camarosa品种进行了尝试。尽管从卡玛罗萨（Camarosa）品种的根部表面和根茎和茎的根部表面和内部组织中分离出了不同的固氮菌菌株，但我们尚未从帕雅罗（Pajaro）品种中分离出固氮菌。经过微生物学和分子鉴定（ARDRA）后，我们确定这些分离物属于巴西种。所有分离株均具有固定氮，生成铁载体和吲哚的能力。当在补充或不补充色氨酸（0.1 mg ml-1）的无氮NFb半固体培养基中生长时，本地分离株表现出不同的吲哚产量。这是关于草莓植物中天然存在的巴西农杆菌（A. brasilense），特别是定殖于茎的内部组织以及根中的第一份报告。本地分离株在PGPB组中显示出三个重要特征：N2-固定，铁载体和吲哚生成。

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