1887

Abstract

Four orange-pigmented isolates, L7-456, L7-484, L9-479 and L9-753, originating from surface-sterilized leaf tissues of L. cultivars were characterized using a polyphasic taxonomic approach. Phylogenetic analyses based on 16S rRNA gene sequences indicated that all four isolates belong to the genus . In these analyses, strain L7-484 appeared to be most closely related to 5715S-12 (95.7 % sequence identity). The 16S rRNA gene sequences of strains L7-456, L9-479 and L9-753 were found to be identical and also shared the highest similarity with 5715S-12 (97.5 %). Both L7-484 and L9-753 contained Q-10 and Q-9 as predominant ubiquinones and diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylmonomethylethanolamine, phosphatidylethanolamine, phosphatidyldimethylethanolamine, sulfoquinovosyldiacylglycerol and an aminophospholipid as the major polar lipids. Cω7 and C were the major fatty acids. Similar to other species in the genus , hydroxylated fatty acids (e.g. C 2-OH) and cyclic fatty acids (C cyclo ω8) were also present. The DNA G+C contents of L7-484 and L9-753 were 66.1 and 69.4 mol%, respectively. Strains L7-484 and L9-753 exhibited less than 40 % DNA–DNA hybridization both between themselves and to KACC 11607. Our results support the proposal that strain L7-484 represents a novel species within the genus , for which the name sp. nov. is proposed, and that strains L9-753, L7-456 ( = KACC 16229  = DSM 25023) and L9-479 ( = KACC 16228  = DSM 25024) represent a second novel species within the genus, for which the name sp. nov. is proposed. The type strains of sp. nov. and sp. nov. are respectively L7-484 ( = KACC 16230  = DSM 25025) and L9-753 ( = KACC 16231  = DSM 25026).

Funding
This study was supported by the:
  • , Temasek Foundation
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2013-05-01
2020-07-14
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