Nitrogen-phosphorus-associated metabolic activities during the development of a cyanobacterial bloom revealed by metatranscriptomics

Scientific Reports
Jingrang LuShunshan Duan

Abstract

The efforts towards reduction of nutrient contamination of surface waters have greatly gained attention to mitigate increasing incidences of harmful cyanobacterial blooms (CyanoHABs), but little attention has been paid on the roles and importance of cyanobacterial N2-fixation and phosphorus (P) scavenging pathways during cyanoHABs. Meta-transcriptomic analyses revealed that expressions of genes involved in N2-fixation (nifDKH) and P-scavenging were significantly upregulated during the bloom compared to pre-bloom in Harsha Lake. The activities of N2-fixation occurred during early summer after a late spring phytoplankton bloom, and were associated with high phosphorus and low nitrogen. The highly active cyanobacterial N2-fixers were dominated by Nostoc and Anabaena. Following the activities of N2-fixation and production of new nitrogen, an early summer Microcystis-dominated bloom, a shift of dominance from Nostoc and Anabaena to Microcystis and an increase of microcystin and saxitoxin occurred. By contrast, P-scavenging activities dominated also by Nostoc and Anabaena were associated with low P and the Microcystis bloom. This information can be used to aid in the understanding the impact that nitrogen and phosphorus have on the e...Continue Reading

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Citations

Dec 15, 2020·Journal of Microbiological Methods·Caitlin S RomanisBrett A Neilan
Jun 28, 2021·Environmental Science and Pollution Research International·Deviram GarlapatiVenkata Ramanamurthy Mallavarapu
Aug 4, 2021·Environmental Science & Technology·Davide Vione, Fernando L Rosario-Ortiz

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Datasets Mentioned

BETA
SRP127716

Methods Mentioned

BETA
Illumina sequencing
electrophoresis
RNA-Seq

Software Mentioned

Illumina NexteraXT
SAS
QuantStudio
MG
RAST

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