Chemolithoautotrophic oxidation of thiosulfate and phylogenetic distribution of sulfur oxidation gene (soxB) in rhizobacteria isolated from crop plants.
Twenty-one thiosulfate-oxidizing bacteria were isolated from rhizosphere soils and 16S rRNA analysis revealed that the isolates were affiliated with seven different phylogenetic groups within the Beta and Gamma subclasses of Proteobacteria and Actinobacteria. Among these, five genera, including Dyella, Burkholderia, Alcaligenes, Microbacterium and Leifsonia sp., represented new sulfur oxidizers in rhizosphere soils. The thiosulfate-oxidizing Dyella, Burkholderia, Alcaligenes, Microbacterium, Leifsonia and Pandoraea were able to grow chemolithotrophically with a medium containing thiosulfate and exhibited growth coupled with thiosulfate oxidation. They accumulated intermediate products such as sulfur, sulfite and trithionate in the spent medium during the time course of thiosulfate oxidation, and these products were finally oxidized into sulfate. Furthermore, they possessed thiosulfate-metabolizing enzymes such as rhodanese, thiosulfate oxidase, sulfite oxidase and trithionate hydrolase, suggesting that these bacteria use the 'S4 intermediate' (S4I) pathway for thiosulfate oxidation. Phylogenetic analysis of the soxB gene revealed that Pandoraea sp. and Pandoraea pnomenusa strains formed a separate lineage within Betaproteobacteria.
Anandham
Rangasamy
R
Department of Agricultural Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea. anandhamranga@gmail.com
Indiragandhi
Pandiyan
P
Madhaiyan
Munusamy
M
Ryu
Kyoung Yul
KY
Jee
Hyeong Jin
HJ
Sa
Tong Min
TM
D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D052837:Chemoautotrophic Growth; D018556:Crops, Agricultural / Q000382:microbiology; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D010802:Phylogeny; D018517:Plant Roots / Q000382:microbiology; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D013455:Sulfur / Q000378:metabolism*; D013885:Thiosulfates / Q000378:metabolism*
D001426:Bacterial Proteins; D012336:RNA, Ribosomal, 16S; D013885:Thiosulfates; D013455:Sulfur