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Hameed A, Lai WA, Shahina M, Stothard P, Young LS, Lin SY, Sridhar KR, Young CC. Differential visible spectral influence on carbon metabolism in heterotrophic marine flavobacteria. FEMS Microbiol Ecol 2020; 96:5710931. [PMID: 31960903 DOI: 10.1093/femsec/fiaa011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 01/20/2020] [Indexed: 12/26/2022] Open
Abstract
The visible spectrum of solar radiation is known to stimulate photoheterotrophic bacterial carbon metabolism. However, its impact on 'strictly' heterotrophic bacteria remains less explored. Here, we show that heterotrophic flavobacteria exhibit enhanced uptake and mineralization of dissolved organic carbon with increasing wavelengths of visible light, without employing any 'known' light-harvesting mechanisms. RNA sequencing identified blue light as a major constraint in the extracellular enzymatic hydrolysis of polymeric carbohydrates and acquisition of sugars, despite acting as a stimulus for inorganic carbon sequestration. In contrast, green-red and continuous full-spectrum lights activated diverse hydrolytic enzymes and sugar transporters, but obstructed inorganic carbon fixation. This 'metabolic switching' was apparent through limited nutrient uptake, suppressed light-sensitivity, oxidative stress response and promotion of inorganic carbon sequestration pathways under blue light. The visible light impact on metabolism may be of significant ecological relevance as it appears to promote cell-mediated mineralization of organic carbon in 'green-colored' chlorophyll-rich copiotrophic coastal seawater and inorganic carbon sequestration in 'blue-colored' oligotrophic open ocean. Thus, a novel regulatory role played by light on heterotrophic metabolism and a hidden potential of flavobacteria to sense and respond differentially to monochromatic lights influencing marine carbon cycling were unraveled.
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Affiliation(s)
- Asif Hameed
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, 145, XingDa Road, Taichung 40227, Taiwan
| | - Wei-An Lai
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, 145, XingDa Road, Taichung 40227, Taiwan
| | - Mariyam Shahina
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, 145, XingDa Road, Taichung 40227, Taiwan
| | - Paul Stothard
- Department of Agricultural, Food and Nutritional Science, University of Alberta, 1427 College Plaza, Edmonton, Alberta, Canada
| | - Li-Sen Young
- Tetanti AgriBiotech Inc. No. 1, Gongyequ 10th Rd., Xitun Dist., Taichung 40755, Taiwan
| | - Shih-Yao Lin
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, 145, XingDa Road, Taichung 40227, Taiwan
| | | | - Chiu-Chung Young
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, 145, XingDa Road, Taichung 40227, Taiwan.,Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 145, XingDa Road, Taichung 40227, Taiwan
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Choi S, Kang JW, Yoon JH, Seong CN. Dokdonia flava sp. nov., isolated from the seaweed Zostera marina. Int J Syst Evol Microbiol 2018; 68:899-904. [PMID: 29458481 DOI: 10.1099/ijsem.0.002607] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A non-motile, proteorhodopsin-containing, yellow and rod-shaped bacterial strain, designated ZODW10T, was isolated from the seaweed Zostera marina collected from the West Sea, Republic of Korea. Cells were Gram-stain-negative, aerobic and non-motile. The isolate required sea salts for growth. A carotenoid pigment was produced. A phylogenetic tree based on 16S rRNA gene sequences showed that strain ZODW10T forms an evolutionary lineage within the radiation enclosing members of the genus Dokdonia with Dokdoniadiaphoros CIP 108745T (96.7 % sequence similarity) as its nearest neighbour. The major fatty acids were iso-C15:0, iso-C17 : 0 3-OH and iso-C15 : 1 G. Strain ZODW10T contained menaquinone 6 (MK-6) and phosphatidylethanolamine, an unidentified aminolipid and an unidentified polar lipid as the only isoprenoid quinone and the major polar lipids, respectively. The DNA G+C content of strain ZODW10T was 36 mol%. On the basis of the present polyphasic characterization, it is suggested that the isolate represents a novel species of the genus Dokdonia, for which the name Dokdonia flava sp. nov. (type strain, ZODW10T=KCTC 52953T=JCM 32293T) is proposed.
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Affiliation(s)
- Seon Choi
- Department of Biology, College of Life Science and Natural Resources, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Joo Won Kang
- Department of Biology, College of Life Science and Natural Resources, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Jung-Hoon Yoon
- Department of Food Science and Biotechnology, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Chi Nam Seong
- Department of Biology, College of Life Science and Natural Resources, Sunchon National University, Suncheon 57922, Republic of Korea
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