Diana Hernández-Oaxaca, Karen Claro, Marco A. Rogel, Mónica Rosenblueth, Julio Martinez-Romero, Esperanza Martinez-Romero
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引用次数: 0
摘要
Inga vera和Lysiloma树豆类与Bradyrhizobium spp.形成结节。来自日本科，代表了新的基因组物种，我们在这里使用基因组数据描述了这些物种，共生菌lysilomae、lysilomaefficiens和ingae。在ingae中发现了编码三型分泌系统（TTSS）的基因，这些基因可以影响宿主的特异性，但在溶胞菌和溶胞菌共生体中都没有发现，在来自共生体ingae和溶胞杆菌的慢根瘤菌中观察到了摄取氢酶hup基因（影响固氮）。nolA基因在溶胞菌中发现，但在溶胞杆菌菌株中未发现。我们讨论了多个基因可能决定共生特异性。此外，在慢根瘤菌的共生岛中还发现了毒素-抗毒素基因。本文提出了用nifH基因序列定义共生体变体的限度（95%）。
Novel symbiovars ingae, lysilomae and lysilomaefficiens in bradyrhizobia from tree-legume nodules
Inga vera and Lysiloma tree legumes form nodules with Bradyrhizobium spp. from the japonicum group that represent novel genomospecies, for which we describe here using genome data, symbiovars lysilomae, lysilomaefficiens and ingae. Genes encoding Type three secretion system (TTSS) that could affect host specificity were found in ingae but not in lysilomae nor in lysilomaefficiens symbiovars and uptake hydrogenase hup genes (that affect nitrogen fixation) were observed in bradyrhizobia from the symbiovars ingae and lysilomaefficiens. nolA gene was found in the symbiovar lysilomaefficiens but not in strains from lysilomae. We discuss that multiple genes may dictate symbiosis specificity. Besides, toxin-antitoxin genes were found in the symbiosis islands in bradyrhizobia from symbiovars ingae and lysilomaefficiens. A limit (95%) to define symbiovars with nifH gene sequences was proposed here.
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