1887

Abstract

Root nodule bacteria were trapped within cowpea () in soils with different cultivation histories collected from the Amazonian rainforest in northern Brazil. Analysis of the 16S rRNA gene sequences of six strains (BR 3351, BR 3307, BR 3310, BR 3315, BR 3323 BR and BR 3361) isolated from cowpea nodules showed that they formed a distinct group within the genus , which was separate from previously identified type strains. Phylogenetic analyses of three housekeeping genes (, and ) revealed that CCBAU 23303 was the most closely related type strain (96 % sequence similarity or lower). Chemotaxonomic data, including fatty acid profiles (predominant fatty acids being C and summed feature 8), the slow growth rate and carbon compound utilization patterns supported the assignment of the strains to the genus . The results of DNA–DNA hybridizations, antibiotic resistance and physiological tests differentiated these novel strains from the most closely related species of the genus with validly published names. Symbiosis-related genes for nodulation () and nitrogen fixation () grouped the novel strains of the genus together with strain EK05, with 94 % and 96 % sequence similarity, respectively. Based on these data, these six strains represent a novel species for which the name sp. nov. (BR 3351 = HAMBI 3596), is proposed.

Funding
This study was supported by the:
  • CNPq
  • Embrapa
  • Murdoch University
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2014-07-01
2024-10-04
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