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Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology

Humic substances (HS) act as biostimulants for terrestrial photosynthetic organisms. Their effects on plants are related to specific HS features: pH and redox buffering activities, (pseudo)emulsifying and surfactant characteristics, capacity to bind metallic ions and to encapsulate labile hydrophobi...

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Autores principales: Popa, Daria Gabriela, Lupu, Carmen, Constantinescu-Aruxandei, Diana, Oancea, Florin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9143693/
https://www.ncbi.nlm.nih.gov/pubmed/35621978
http://dx.doi.org/10.3390/md20050327
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author Popa, Daria Gabriela
Lupu, Carmen
Constantinescu-Aruxandei, Diana
Oancea, Florin
author_facet Popa, Daria Gabriela
Lupu, Carmen
Constantinescu-Aruxandei, Diana
Oancea, Florin
author_sort Popa, Daria Gabriela
collection PubMed
description Humic substances (HS) act as biostimulants for terrestrial photosynthetic organisms. Their effects on plants are related to specific HS features: pH and redox buffering activities, (pseudo)emulsifying and surfactant characteristics, capacity to bind metallic ions and to encapsulate labile hydrophobic molecules, ability to adsorb to the wall structures of cells. The specific properties of HS result from the complexity of their supramolecular structure. This structure is more dynamic in aqueous solutions/suspensions than in soil, which enhances the specific characteristics of HS. Therefore, HS effects on microalgae are more pronounced than on terrestrial plants. The reported HS effects on microalgae include increased ionic nutrient availability, improved protection against abiotic stress, including against various chemical pollutants and ionic species of potentially toxic elements, higher accumulation of value-added ingredients, and enhanced bio-flocculation. These HS effects are similar to those on terrestrial plants and could be considered microalgal biostimulant effects. Such biostimulant effects are underutilized in current microalgal biotechnology. This review presents knowledge related to interactions between microalgae and humic substances and analyzes the potential of HS to enhance the productivity and profitability of microalgal biotechnology.
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spelling pubmed-91436932022-05-29 Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology Popa, Daria Gabriela Lupu, Carmen Constantinescu-Aruxandei, Diana Oancea, Florin Mar Drugs Review Humic substances (HS) act as biostimulants for terrestrial photosynthetic organisms. Their effects on plants are related to specific HS features: pH and redox buffering activities, (pseudo)emulsifying and surfactant characteristics, capacity to bind metallic ions and to encapsulate labile hydrophobic molecules, ability to adsorb to the wall structures of cells. The specific properties of HS result from the complexity of their supramolecular structure. This structure is more dynamic in aqueous solutions/suspensions than in soil, which enhances the specific characteristics of HS. Therefore, HS effects on microalgae are more pronounced than on terrestrial plants. The reported HS effects on microalgae include increased ionic nutrient availability, improved protection against abiotic stress, including against various chemical pollutants and ionic species of potentially toxic elements, higher accumulation of value-added ingredients, and enhanced bio-flocculation. These HS effects are similar to those on terrestrial plants and could be considered microalgal biostimulant effects. Such biostimulant effects are underutilized in current microalgal biotechnology. This review presents knowledge related to interactions between microalgae and humic substances and analyzes the potential of HS to enhance the productivity and profitability of microalgal biotechnology. MDPI 2022-05-16 /pmc/articles/PMC9143693/ /pubmed/35621978 http://dx.doi.org/10.3390/md20050327 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Review
Popa, Daria Gabriela
Lupu, Carmen
Constantinescu-Aruxandei, Diana
Oancea, Florin
Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology
title Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology
title_full Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology
title_fullStr Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology
title_full_unstemmed Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology
title_short Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology
title_sort humic substances as microalgal biostimulants—implications for microalgal biotechnology
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9143693/
https://www.ncbi.nlm.nih.gov/pubmed/35621978
http://dx.doi.org/10.3390/md20050327
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