Nitrogen and Carbon Fixation and Comprehensive Utilization of Photosynthetic Algae

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Physiology and Metabolism".

Deadline for manuscript submissions: closed (30 August 2023) | Viewed by 3425

Special Issue Editors


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Guest Editor
Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
Interests: nitrogen fixation and removal by algae; algal carbon fixation; algal culture; biomass utilization; high-value product

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Guest Editor
College of Resources and Environment, Hunan Agricultural University, Changsha, China
Interests: physiology, ecology, and toxicology of diazotrophic cyanobacteria; microbial nitrogen cycling in paddy field

Special Issue Information

Dear Colleagues,

Photosynthetic algae contribute more than half of all primary productivity on Earth. These special plants are a polyphyletic group of eukaryotic and prokaryotic organisms and could be divided into two categories in morphology: unicellular algae (such as Chlorella, Phaeodactylum tricornutum, etc.) and multicellular algae (such as Spirulina, brown algae, etc.). Compared with higher plants, algae have the advantages of high photosynthetic efficiency, easy industrial cultivation, and high availability of biomass. Algae can efficiently absorb, fix, and convert CO2 and nitrogen into biomass via photosynthesis. In addition, algal biomass contains a variety of high-value products, such as phycocyanin, astaxanthin, etc.

In recent years, the application of algae (especially microalgae) in flue gas CO2 fixation, wastewater nitrogen removal, and biomass high-value utilization has received close attention and research. This Special Issue provides a good platform and opportunity for colleagues working in related fields and welcomes high-quality articles related to:

  • Direct fixation of nitrogen in the atmosphere by algae (cyanobacteria) and related mechanisms;
  • Absorption, removal, and transformation of nitrogen in wastewater and flue gas by algae;
  • Mechanisms and practice of algae efficient fixation and transformation of CO2 in atmosphere and flue gas;
  • Combined application of nitrogen removal and carbon fixation by algae;
  • Comprehensive refining technology of algae biomass, including bioenergy production, extraction of high-value products, preparation of biofertilizer, etc.

Dr. Zhongjie Wang
Prof. Dr. Jihai Shao
Guest Editors

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Keywords

  • algae
  • high-value product
  • nitrogen fixation
  • carbon dioxide fixation
  • algal biomass
  • biomass utilization
  • nitrogen removal
  • wastewater
  • flue gas

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Published Papers (1 paper)

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Research

13 pages, 6102 KiB  
Article
Optimization of Heterotrophic Culture Conditions for the Algae Graesiella emersonii WBG-1 to Produce Proteins
by Kaixuan Wang, Zhongjie Wang, Yi Ding, Youzhi Yu, Yali Wang, Yahong Geng, Yeguang Li and Xiaobin Wen
Plants 2023, 12(12), 2255; https://doi.org/10.3390/plants12122255 - 9 Jun 2023
Cited by 8 | Viewed by 2968
Abstract
The aim of this study was to improve the protein content and yield of heterotrophic microalgal cultivation and establish a simple, economical, and efficient method for microalgal protein production using the novel green alga, Graesiella emersonii WBG-1, which has not been previously reported [...] Read more.
The aim of this study was to improve the protein content and yield of heterotrophic microalgal cultivation and establish a simple, economical, and efficient method for microalgal protein production using the novel green alga, Graesiella emersonii WBG-1, which has not been previously reported for heterotrophic cultivation. Through batch heterotrophic cultivation of this alga, we observed that glucose was the optimal carbon source, while it could not use sucrose as a carbon source. Biomass production and protein content were significantly reduced when sodium acetate was used as the carbon source. Compared with nitrate, protein content increased by 93% when urea was used as the nitrogen source. Cultivation temperature had a significant impact on biomass production and protein content. The optimal conditions were glucose as the carbon source at an initial concentration of 10 g/L, urea as the nitrogen source at an initial concentration of 1.62 g/L, and a culture temperature of 35 °C. On the second day of batch cultivation, the highest protein content (66.14%) was achieved, which was significantly higher than that reported in heterotrophic cultures of Chlorella and much higher than that reported for specially established technologies aimed at increasing the protein content, such as two-stage heterotrophic, heterotrophy–dilution–photoinduction, and mixotrophic processes. These results demonstrate the great potential of the heterotrophic cultivation of G. emersonii WBG-1 for protein production. Full article
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