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How sequential reduction of terminal electron acceptors modulates nitrification and dynamics of nitrifying bacteria and archaea in a tropical vertisol

Published online by Cambridge University Press:  10 April 2018

Santosh Ranjan Mohanty*
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
Rakhi Yadav
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
Garima Dubey
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
Usha Ahirwar
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
Neha Ahirwar
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
K. Aparna
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
D. L. N. Rao
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
Bharati Kollah
Affiliation:
ICAR - Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
*
Author for correspondence: Santosh Ranjan Mohanty, E-mail: santosh.mohanty@icar.gov.in

Abstract

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 the amoA gene 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.

Type
Crops and Soils Research Paper
Copyright
Copyright © Cambridge University Press 2018 

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