Microbial Sulfur Cycle in Two Hydrothermal Chimneys on the Southwest Indian Ridge
Cao, Huiluo1; Wang, Yong1,2; Lee, On On1; Zeng, Xiang3; Shao, Zongze3; Qian, Pei-Yuan1
Source PublicationMBIO
AbstractSulfur is an important element in sustaining microbial communities present in hydrothermal vents. Sulfur oxidation has been extensively studied due to its importance in chemosynthetic pathways in hydrothermal fields; however, less is known about sulfate reduction. Here, the metagenomes of hydrothermal chimneys located on the ultraslow-spreading Southwest Indian Ridge (SWIR) were pyrosequenced to elucidate the associated microbial sulfur cycle. A taxonomic summary of known genes revealed a few dominant bacteria that participated in the microbial sulfur cycle, particularly sulfate-reducing Deltaproteobacteria. The metagenomes studied contained highly abundant genes related to sulfur oxidation and reduction. Several carbon metabolic pathways, in particular the Calvin-Benson-Bassham pathway and the reductive tricarboxylic acid cycles for CO2 fixation, were identified in sulfur-oxidizing autotrophic bacteria. In contrast, highly abundant genes related to the oxidation of short-chain alkanes were grouped with sulfate-reducing bacteria, suggesting an important role for short-chain alkanes in the sulfur cycle. Furthermore, sulfur-oxidizing bacteria were associated with enrichment for genes involved in the denitrification pathway, while sulfate-reducing bacteria displayed enrichment for genes responsible for hydrogen utilization. In conclusion, this study provides insights regarding major microbial metabolic activities that are driven by the sulfur cycle in low-temperature hydrothermal chimneys present on an ultraslow midocean ridge.
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
WOS SubjectMicrobiology
WOS IDWOS:000332526500009
Citation statistics
Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Hong Kong Univ Sci & Technol, Div Life Sci, Hong Kong, Hong Kong, Peoples R China
2.Sanya Inst Deep Sea Sci & Engn, San Ya, Hai Nan, Peoples R China
3.State Ocean Adm, Inst Oceanog 3, Key Lab Marine Biogenet Resources, Xiamen, Peoples R China
Recommended Citation
GB/T 7714
Cao, Huiluo,Wang, Yong,Lee, On On,et al. Microbial Sulfur Cycle in Two Hydrothermal Chimneys on the Southwest Indian Ridge[J]. MBIO,2014,5(1).
APA Cao, Huiluo,Wang, Yong,Lee, On On,Zeng, Xiang,Shao, Zongze,&Qian, Pei-Yuan.(2014).Microbial Sulfur Cycle in Two Hydrothermal Chimneys on the Southwest Indian Ridge.MBIO,5(1).
MLA Cao, Huiluo,et al."Microbial Sulfur Cycle in Two Hydrothermal Chimneys on the Southwest Indian Ridge".MBIO 5.1(2014).
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