TY - JOUR
T1 - The unexpected concentration-dependent response of periphytic biofilm during indole acetic acid removal
AU - Wang, Sichu
AU - Ma, Lan
AU - Xu, Ying
AU - Wang, Yu
AU - Zhu, Ningyuan
AU - Liu, Junzhuo
AU - Dolfing, Jan
AU - Kerr, Philip
AU - Wu, Yonghong
PY - 2020/5/1
Y1 - 2020/5/1
N2 - Due 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.
AB - Due 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.
KW - Bioremediation
KW - Concentration-dependent effect
KW - Indole acetic acid
KW - Periphytic biofilm
KW - Plant growth regulators
U2 - 10.1016/j.biortech.2020.122922
DO - 10.1016/j.biortech.2020.122922
M3 - Article
C2 - 32044647
AN - SCOPUS:85079009378
SN - 0960-8524
VL - 303
SP - 122922
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 122922
ER -
