Platymonas helgolandica-driven nitrogen removal from mariculture wastewater under different photoperiods: Performance evaluation, enzyme activity and transcriptional response

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作   者：

Chu, Guangyu;  Wang, Qianzhi;  Song, Chenguang;  Liu, Jiateng;  Zhao, Yangguo;  Lu, Shuailing;  Zhang, Zhiming;  Jin, Chunji;  Gao, Mengchun; 

作者机构：

Ocean Univ China; 

关键词：

Differentially expressed genes;  Photosynthetic activity;  Nitrogen metabolism;  GROWTH;  Photoperiod;  Mariculture wastewater; 

期刊名称：

Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies

i s s n：

0960-8524

年卷期：

2023 年 372 卷

页   码：

ARTN 128700-

页   码：

摘   要：

The nitrogen removal performance and biological mechanism of Platymonas helgolandica var. Tsingtaoensis (P. helgolandica) were investigated in treating mariculture wastewater under different light: dark (L:D) photoperiods. The growth of P. helgolandica was positively correlated with the photoperiods from 6L:18D to 15L:9D, and the highest photosynthetic activity appeared under 6L:18D photoperiod on day 3. P. helgolandica exhibited the highest removal efficiencies of total nitrogen and COD at 89 % and 93 % under 15L:9D photoperiod, respectively. NH4+-N assimilation was proportional to the photoperiods from 6L:18D to 15L:9D and longer illumination pro-moted NO2-N removal. However, the highest NO3- N reduction rate was achieved under 12L:12D photoperiod. The different nitrogen-transformed enzymatic activities were affected by photoperiod. Transcriptome revealed that unigenes were enriched in nitrogen metabolism and photosynthesis pathways, of which the functional gene expression was up-regulated significantly. This study provides insights into the optimization of photoperiod for mariculture wastewater treatment by P. helgolandica.