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The unexpected concentration-dependent response of periphytic biofilm during indole acetic acid removal

Lookup NU author(s): Dr Jan DolfingORCiD, Dr Yonghong Wu



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Elsevier Ltd, 2020.

For re-use rights please refer to the publisher's terms and conditions.


© 2020 Elsevier LtdDue to its extensive application in agriculture as a germinating agent and growth promoter, indole acetic acid (IAA) is present in a variety of aquatic ecosystems. To explore the response of microbial aggregates to exogenous IAA in aquatic ecosystems, periphytic biofilm, a typical microbial aggregate, was exposed to IAA at different concentrations. Results reveal an unexpected concentration-dependent effect of IAA on periphytic biofilm. Concentrations of IAA less than 10 mg/L inhibit periphytic growth, but stimulate growth when the IAA concentration exceeds 50 mg/L. Periphytic biofilm adapts to different IAA concentrations by antioxidant enzyme activation, community structure optimization and carbon-metabolism pattern change, and promotes bioremediation of IAA contaminated water in the process. The removal rates of IAA reached up to 95%–100%. This study reveals the capacity of periphytic biofilm for IAA removal in practice.

Publication metadata

Author(s): Wang S, Ma L, Xu Y, Wang Y, Zhu N, Liu J, Dolfing J, Kerr P, Wu Y

Publication type: Article

Publication status: Published

Journal: Bioresource Technology

Year: 2020

Volume: 303

Print publication date: 01/05/2020

Online publication date: 29/01/2020

Acceptance date: 25/01/2020

Date deposited: 08/04/2020

ISSN (print): 0960-8524

ISSN (electronic): 1873-2976

Publisher: Elsevier Ltd


DOI: 10.1016/j.biortech.2020.122922


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