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首页> 外文期刊>Applied Microbiology >Genome Analysis Suggests that the Soil Oligotrophic Bacterium Agromonas oligotrophica (Bradyrhizobium oligotrophicum) Is a Nitrogen-Fixing Symbiont of Aeschynomene indica
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Genome Analysis Suggests that the Soil Oligotrophic Bacterium Agromonas oligotrophica (Bradyrhizobium oligotrophicum) Is a Nitrogen-Fixing Symbiont of Aeschynomene indica

机译：基因组分析表明土壤低营养细菌土壤单胞菌（Bradyrhizobium oligotrophicum）是A草中的固氮共生菌。

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Agromonas oligotrophica ( Bradyrhizobium oligotrophicum ) S58~(T) is a nitrogen-fixing oligotrophic bacterium isolated from paddy field soil that is able to grow in extra-low-nutrient environments. Here, the complete genome sequence of S58 was determined. The S58 genome was found to comprise a circular chromosome of 8,264,165 bp with an average GC content of 65.1% lacking nodABC genes and the typical symbiosis island. The genome showed a high level of similarity to the genomes of Bradyrhizobium sp. ORS278 and Bradyrhizobium sp. BTAi1, including nitrogen fixation and photosynthesis gene clusters, which nodulate an aquatic legume plant, Aeschynomene indica , in a Nod factor-independent manner. Although nonsymbiotic (brady)rhizobia are significant components of rhizobial populations in soil, we found that most genes important for nodule development ( ndv ) and symbiotic nitrogen fixation ( nif and fix ) with A. indica were well conserved between the ORS278 and S58 genomes. Therefore, we performed inoculation experiments with five A. oligotrophica strains (S58, S42, S55, S72, and S80). Surprisingly, all five strains of A. oligotrophica formed effective nitrogen-fixing nodules on the roots and/or stems of A. indica , with differentiated bacteroids. Nonsymbiotic (brady)rhizobia are known to be significant components of rhizobial populations without a symbiosis island or symbiotic plasmids in soil, but the present results indicate that soil-dwelling A. oligotrophica generally possesses the ability to establish symbiosis with A. indica . Phylogenetic analyses suggest that Nod factor-independent symbiosis with A. indica is a common trait of nodABC - and symbiosis island-lacking strains within the members of the photosynthetic Bradyrhizobium clade, including A. oligotrophica .
机译：少土壤农杆菌（Agromonas oligotrophica）S58〜（T）是一种从稻田土壤中分离出来的固氮低营养细菌，能够在极低营养的环境中生长。在此，确定了S58的完整基因组序列。发现S58基因组包含8,264,165 bp的圆形染色体，平均GC含量为65.1％，缺少nodABC基因和典型的共生岛。基因组显示出与Bradyrhizobium sp。的基因组高度相似。 ORS278和Bradyrhizobium sp。 BTAi1，包括固氮和光合作用基因簇，以不依赖Nod因子的方式结节水生豆科植物Aeschynomene indica。尽管非共生（根状）根瘤菌是土壤中根瘤菌种群的重要组成部分，但我们发现ORS278和S58基因组之间对most节根发育（ndv）和sym的共生固氮（nif和fix）重要的大多数基因都非常保守。因此，我们进行了五种低营养曲霉菌株（S58，S42，S55，S72和S80）的接种实验。出人意料的是，五种低营养土壤杆菌的所有菌株均在印度土壤杆菌的根和/或茎上形成了有效的固氮根瘤，并带有不同的类细菌。已知非共生的（根状）根瘤菌是根瘤菌种群的重要组成部分，在土壤中没有共生岛或没有共生质粒，但是目前的结果表明，土壤居留的拟南芥通常具有与印度拟南芥建立共生的能力。系统发生学分析表明，与No.因子无关的with曲霉共生是nodABC的一个共同特征，并且是光合缓生根瘤进化枝成员中的少见共生菌株，包括寡养曲霉。

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