식생대와 비식생대 퍼갯벌의 미생물 호흡경로와 관련된 delta-proteobacteria 군집구조

Title
식생대와 비식생대 퍼갯벌의 미생물 호흡경로와 관련된 delta-proteobacteria 군집구조
Alternative Title
COMMUNITY STRUCTURE OF DELTA-PROTEOBACTERIA ASSOCIATED WITH PATHWAYS OF MICROBIAL RESPIRATION IN VEGETATED AND UNVEGETATED INTERTIDAL MUDFLAT
Author(s)
현정호; 목진숙; 조혜연; 김성한; JE Kostka
KIOST Author(s)
Kim, Sung Han(김성한)
Publication Year
2006-08-21
Abstract
This study was to relate pathways of microbial respiration to molecular hylogenetic evidence in the unvegetated (UMF) and vegetated mudflat (VMF) covered by Suaeda japonica in Korea. Concentrations of Fe2+ at VMF were 4X higher in July (3.6 mmol m-2) and 15X higher in Octover (35.2 mmol m-2) than at UMF (0.9 mmol m-2 in July and 2.3 mmol m-2 in October). C mineralization in July was 3.2X higher at VMF (142.1 mmolC m-2d-1) than at UMF (45.4 mmolC m-2d-1), whereas C mineralization in October was only 1.6X higher at VMF (30.4 mmolC m-2d-1) than at the UMF (18.4 mmolC m-2d-1). The rate of sulfate reduction in July was 2.9X higher at VMF (53.0 mmolS m-2d-1) than at UMF (18.4 mmolS m-2d-1), but little difference was observed between VMF (9.3 mmolS m-2d-1) and UMF (10.9 mmolS m-2d-1) in October. Highest rates of C respiration and sulfate reduction at VMF in July indicated that actively growing plant roots and rhizomes excrete DOM, fueling bacterial metabolism. Molecular phylogenetic analysis of delta-Proteobacteria clones based on 16S rDNA sequence revealed that Desulfuromonas/Pelobacter using Fe(III) and So as an electron acceptor were dominating at the rhizosphere of VMF, whereas most sulfate reducing bacterial clones (Desulfobacterium & Desulfobulbus) were observed at both UMF and VMF sites. Combinations of biogeochemical measurements and molecular phylogenetic evidence indicated that, although sulfate reduction was a prevailing C mineralization pathway in the organic rich intertidal mudflat, microbial Fe(III) reduction was a significant C mineralization pathway at VMF site.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30922
Bibliographic Citation
11th ISME, pp.74, 2006
Publisher
ISME
Type
Conference
Language
English
Publisher
ISME
Related Researcher
Research Interests

Marine chemistry,Benthic biogeochemistry,Microbial ecology,해양화학,퇴적물 생지화학,미생물 생태학

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