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Tree species-specific wood traits control diazotrophic community composition in deadwood

Title data

Hossen, Shakhawat ; Groß, Christina ; Stapf, Dominik ; Borken, Werner ; Noll, Matthias:
Tree species-specific wood traits control diazotrophic community composition in deadwood.
In: International Biodeterioration & Biodegradation. Vol. 187 (2024) . - 105723.
ISSN 0964-8305
DOI: https://doi.org/10.1016/j.ibiod.2023.105723

Abstract in another language

Deadwood is a nitrogen (N) poor environment and its decomposition rate is limited by low N bioavailability. Diazotrophs reduce such N limitations as they are capable of fixing N2 which employs the functional gene nifH. The present study investigates the diazotrophic community composition in deadwood logs of 13 different tree species in temperate forests. Directly after sampling, deadwood was incubated with water (total fraction) or bromodeoxyuridine (BrdU), and latter labeled the metabolically active fraction. Nucleic acid extracts from both fractions were used to assess the nifH gene-based diversity by amplicon sequencing. The active fraction was a subset of the total fraction, which differed in abundance and with a lower richness. Wood traits such as phosphorous, molybdenum, magnesium, glucose concentration, and C:N ratio were positive factors of richness and community composition of the active fraction. Bradyrhizobium and Methylocapsa dominated the total fraction, while the active fraction was mainly governed by Frankia and Treponema regardless of tree species studied, suggesting that they are well adapted to C sources and nutrient-poor conditions in deadwood. The great diazotrophic diversity (50 genera) in the active fraction indicates an enormous potential for biological N fixation during deadwood decay.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: nifH gene diversity; N₂ fixation; Deadwood log; Metabolically active diazotroph
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology > Chair Soil Ecology - Univ.-Prof. Dr. Eva Lehndorff
Research Institutions > Central research institutes > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: No
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 15 Jan 2024 10:31
Last Modified: 15 Jan 2024 10:31
URI: https://eref.uni-bayreuth.de/id/eprint/88202