https://scholars.lib.ntu.edu.tw/handle/123456789/605824
Title: | Composition and activity of n2-fixing microorganisms in mangrove forest soils | Authors: | Shiau Y.-J Lin Y.-T Yam R.S.W Chang E.-H Wu J.-M Hsu T.-H SAU-WAI YAM YO-JIN SHIAU |
Keywords: | Acetylene reduction;Diazotrophs;Mangrove;N2 fixation;NifH gene;Sulfate reducing bacteria;Ecosystems;Forestry;Genes;Molybdenum compounds;Polymerase chain reaction;Soils;Sulfur compounds;Mangrove ecosystems;Mangrove forest;Next-generation sequencing;Nitrogenase activity;Nitrogenase genes;Real time polymerase chain reactions;Reduction method;Bacteria;forest soil;gene expression;mangrove;microbial community;nitrogen fixation;sulfate-reducing bacterium;Molybdenum Compounds;Sulfur Compounds;Guandu Wetland;Taiwan;Bacteria (microorganisms) | Issue Date: | 2021 | Journal Volume: | 12 | Journal Issue: | 7 | Source: | Forests | Abstract: | Mangrove forests are considered to be a highly productive ecosystem, but they are also generally nitrogen (N)-limited. Thus, soil N2 fixation can be important for the stability of both mangrove ecosystem functions and upland N supply. This study evaluates the N2 fixation activity and composition of relevant microorganisms in two coastal mangrove forests—the Guandu mangrove in an upstream estuary and the Bali mangrove in a downstream estuary—using the acetylene reduction method, real-time polymerase chain reaction, and next-generation sequencing. The results demonstrated that ambient nitrogenase activity was higher in downstream mangrove forests (13.2–15.6 nmol hr?1 g?1 soil) than in upstream mangrove forests (0.2–1.4 nmol hr?1 g?1 soil). However, both the maximum potential nitrogenase activity and nitrogenase gene (nifH gene) copy number were found to be higher in the upstream than in the downstream mangrove forests, implying that the nitrogenase activity and diazotrophic abundance may not necessarily be positively correlated. In addition, amended MoO4 (which inhibits the activity of sulfate-reducing bacteria in N2-fixation) yielded low nitrogenase activity, and sulfate-reducing bacteria made up 20– 50% of the relative diazotrophic abundance in the mangrove forests, indicating that these bacteria might be the major active diazotrophs in this environment. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109112245&doi=10.3390%2ff12070822&partnerID=40&md5=4cabf7accc3d037058444ef6c97c3e0b https://scholars.lib.ntu.edu.tw/handle/123456789/605824 |
ISSN: | 19994907 | DOI: | 10.3390/f12070822 |
Appears in Collections: | 生物環境系統工程學系 |
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