Previous studies have recognized South and Central/Latin American mimosoid legumes in the genera Mimosa, Piptadenia and Calliandra as hosts for various nodulating Paraburkholderia species. Several of these species have been validly named in the last two decades, e.g., P. nodosa, P. phymatum, P. diazotrophica, P. piptadeniae, P. ribeironis, P. sabiae and P. mimosarum. There are still, however, a number of diverse Paraburkholderia strains associated with these legumes that have an unclear taxonomic status. In this study, we focus on 30 of these strains which originate from the root nodules of Brazilian and Mexican Mimosa species. They were initially identified as P. tuberum and subsequently placed into a symbiovar (sv. mimosae) based on their host preferences. A polyphasic approach for the delineation of these strains was used, consisting of genealogical concordance analysis (using atpD, gyrB, acnA, pab and 16S rRNA gene sequences), together with comparisons of Average Nucleotide Identity (ANI), DNA G + C content ratios and phenotypic characteristics with those of the type strains of validly named Paraburkholderia species. Accordingly, these 30 strains were delineated into two distinct groups, of which one is conspecific with ‘P. atlantica’ CNPSo 3155^T and the other new to Science. We propose the name Paraburkholderia youngii sp. nov. with type strain JPY169^T (= LMG 31411^T; SARCC751^T) for this novel species.

先前的研究已将含羞草，Piptadenia和Calliandra属的南美和中/拉丁美洲含羞草豆科植物定为各种结节性抛物线菌物种的寄主。一些这些物种在过去二十年间被有效命名，例如，P。性多动脉炎，P. phymatum，P. diazotrophica，P. piptadeniae，P. ribeironis，P. sabiae和P。mimosarum。但是，仍然存在许多不同的抛物线持有人与这些豆科植物相关的菌株，其分类学状态尚不清楚。在这项研究中，我们集中于这些菌株中的30个源自巴西和墨西哥含羞草物种的根瘤。他们最初被确定为P。瘤胃，然后根据寄主的喜好放入共生植物（含羞草）。对于这些菌株的划定甲多相方法用于，由（使用系谱一致性分析的ATPD，的gyrB，ACNA，PAB和16S rRNA基因序列），以及平均核苷酸同一性（ANI），DNA G + C含量比和表型特征与有效命名的Paraburkholderia菌种的比较。因此，将这30个菌株划分为两个不同的组，其中一个与' P. atlantica'CNPSo 3155 ^T同种，另一个对Science而言是新的。我们建议使用Paraburkholderia youngii sp。这个名字。十一月 该新物种的型号为JPY169 ^T（= LMG 31411 ^T ; SARCC751 ^T）。