ORIGINAL RESEARCH
Ammonium Inhibits Performance of Rhodopseudomonas palustris in Cyanobacterial Substrate
Yingying Tian 1, 2  
,   Oscar Omondi Donde 2, 3  
,   Cuicui Tian 2  
,   Bing Feng 2, 4  
,   Xingqiang Wu 2  
,   Bangding Xiao 2  
 
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1
School of Material Science and Engineering, Henan Institute of Technology, Xinxiang 453003, China
2
Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, University of Chinese Academy of Sciences, Wuhan 430072, China
3
Department of Environmental Science, Egerton University, P. O. Box 536-20115, Egerton-Kenya
4
Jiangxi Academy of Environmental Sciences, Nanchang 330039, China
Submission date: 2020-03-11
Final revision date: 2020-05-03
Acceptance date: 2020-05-07
Online publication date: 2020-08-17
Publication date: 2020-10-05
 
Pol. J. Environ. Stud. 2021;30(1):385–392
 
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ABSTRACT
Though it is feasible of Rhodopseudomonas palustris (R. palustris) stimulation in the cyanobacterial substrate, less is known about its performance under the high ammonium-nitrogen (NH4-N) circumstance. In the present study, the performance of grown R. palustris Strain PUF1 under an NH4-N gradient were investigated. Results showed that both the bacterial density and the pigment synthesis were severely inhibited at an NH4-N concentration of 6.0 g/L, while the ultrathin structure of survived PUF1 wasn’t obviously changed in comparison to NH4-N concentration ≤3.0 g/L. Noticeably, at an NH4-N concentration of 3.0 g/L PUF1s recovered its biosynthesis of pigments in a six-day acclimation period. Importantly, the PUF1s thrived in algal substrate under the NH4-N concentration ≤1.0 g/L with per mL algal substrate 8.96 to 9.88×108 colony formation unit (CFU) on day six. Moreover, it was more diverse of the bacterial consortia in the low NH4-N treatments (≤1.0 g/L) than that of NH4-N concentration 3.0-6.0 g/L. Additionally, the excess NH4-N reduced the sequestration of phosphorus by PUF1s from the algal substrate. Based on the above findings, an NH4-N threshold up to 1.0 g/L was recommended, it herein produces substantial R. palustris biomass and achieves efficient nutrient sequestration from the protein-rich cyanobacterial feedstock.
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