How sequential reduction of terminal electron acceptors modulates nitrification and dynamics of nitrifying bacteria and archaea in a tropical vertisol
| Autor: | Neha Ahirwar, D. L. N. Rao, Usha Ahirwar, Santosh Ranjan Mohanty, Bharati Kollah, Garima Dubey, K. Aparna, Rakhi Yadav |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
education.field_of_study biology 030106 microbiology Population Electron donor Vertisol biology.organism_classification 03 medical and health sciences chemistry.chemical_compound chemistry Nitrate Nitrifying bacteria Environmental chemistry Carbon dioxide Genetics Animal Science and Zoology Nitrification education Agronomy and Crop Science Relative species abundance |
| Zdroj: | The Journal of Agricultural Science. 156:215-224 |
| ISSN: | 1469-5146 0021-8596 |
| Popis: | Nitrification potential of a tropical vertisol saturated with water was estimated during sequential reduction of nitrate (NO3−), ferric iron (Fe3+), sulphate (SO42−) and carbon dioxide (CO2) in terminal electron-accepting processes (TEAPs). In general, the TEAPs enhanced potential nitrification rate (PNR) of the soil. Nitrification was highest at Fe3+reduction followed by SO42−reduction, NO3−reduction and lowest in unreduced control soil. Predicted PNR correlated significantly with the observed PNR. Electron donor Fe2+stimulated PNR, while S2−inhibited it significantly. Terminal-restriction fragment length polymorphism targeting theamoAgene of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) highlighted population dynamics during the sequential reduction of terminal electron acceptors. Only the relative abundance of AOA varied significantly during the course of soil reduction. Relative abundance of AOB correlated with NO3−and Fe2+. Linear regression models predicted PNR from the values of NO3−, Fe2+and relative abundance of AOA. Principal component analysis of PNR during different reducing conditions explained 72.90% variance by PC1 and 19.52% variance by PC2. Results revealed that AOA might have a significant role in nitrification during reducing conditions in the tropical flooded ecosystem of a vertisol. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|