Engineering microalgae for water phosphorus recovery to close the phosphorus cycle

Long Wang, Xianqing Jia, Lei Xu, Jiahong Yu, Suna Ren, Yujie Yang, Kaibin Wang, Damar López-Arredondo, Luis Herrera-Estrella, Hans Lambers, Keke Yi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

As a finite and non-renewable resource, phosphorus (P) is essential to all life and crucial for crop growth and food production. The boosted agricultural use and associated loss of P to the aquatic environment are increasing environmental pollution, harming ecosystems, and threatening future global food security. Thus, recovering and reusing P from water bodies is urgently needed to close the P cycle. As a natural, eco-friendly, and sustainable reclamation strategy, microalgae-based biological P recovery is considered a promising solution. However, the low P-accumulation capacity and P-removal efficiency of algal bioreactors restrict its application. Herein, it is demonstrated that manipulating genes involved in cellular P accumulation and signalling could triple the Chlamydomonas P-storage capacity to ~7% of dry biomass, which is the highest P concentration in plants to date. Furthermore, the engineered algae could recover P from wastewater almost three times faster than the unengineered one, which could be directly used as a P fertilizer. Thus, engineering genes involved in cellular P accumulation and signalling in microalgae could be a promising strategy to enhance P uptake and accumulation, which have the potential to accelerate the application of algae for P recovery from the water body and closing the P cycle.

Original languageEnglish
Pages (from-to)1373-1382
Number of pages10
JournalPlant Biotechnology Journal
Volume21
Issue number7
DOIs
StatePublished - Jul 2023

Keywords

  • algal fertilizer
  • genetic engineering
  • microalgae
  • phosphorus recovery
  • phosphorus removal
  • wastewater treatment

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