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Volume 65, Issue Pt_2

gen. nov., sp. nov., a plant-growth-promoting bacterium in the family isolated from rhizosphere soil Free

Abstract

Three novel bacterial strains, designated Vu-144, Vu-7 and Vu-35, were isolated on minimal medium from rhizosphere soil of field-grown cowpea and subjected to a taxonomic study using a polyphasic approach. Cells of the strains were Gram-stain-negative, non-motile, non-spore-forming, coccoid rods, and formed non-pigmented colonies. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain Vu-144 was affiliated with an uncultivated lineage of the phylum . Its closest phylogenetic neighbour was the recently described species , a member of the family , with just 90.7 % sequence similarity to the type strain. The only isoprenoid quinone detected was menaquinone 7 (MK-7). The fatty acid profiles showed large amounts of iso-C, iso-C 3-OH and iso-C G and minor amounts of summed feature 3 (Cω7 and/or iso-C 2-OH), C and other fatty acids, allowing the differentiation of the strains from other genera. The G+C content of the genomic DNA of the three strains ranged from 43.1 to 44.3 mol%. In addition to phosphatidylethanolamine, the major polar lipids were three unidentified aminophospholipids (APL1–APL3), two unidentified phospholipids (PL1, PL2) and three unidentified lipids (UL1–UL3). Biochemical test patterns also differed from those of and members of other genera. All three isolates showed plant-growth-promoting properties, e.g. the ability to produce indole-3-acetic acid and NH and to solubilize phosphate, utilized 1-aminocyclopropane 1-carboxylate (ACC) as a sole source of nitrogen and possessed the ACC deaminase enzyme. The novel isolates readily colonized roots and stimulated growth of tomato and cowpea under glasshouse conditions. Inoculated plants showed a 45–60 % increase in dry matter weight with respect to uninoculated controls. On the basis of the evidence from our polyphasic study, isolate Vu-144 represents a novel genus and species in the family , for which the name gen. nov., sp. nov. is proposed. The type strain of is Vu-144 ( = KCTC 22378 = NCIMB 14473).

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Funding
This study was supported by the:
  • KRIBB Research Initiative Program, Daejeon, Republic of Korea
  • Indian Council of Agricultural Research, New Delhi, India
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2023-12-09
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Arachidicoccus rhizosphaerae gen. nov., sp. nov., a plant-growth-promoting bacterium in the family Chitinophagaceae isolated from rhizosphere soil
Int J Syst Evol Microbiol 65, 578 (2015); https://doi.org/10.1099/ijs.0.069377-0
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