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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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Marine Drugs |
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| Online Access: | https://www.mdpi.com/1660-3397/20/5/327 |
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| author | Daria Gabriela Popa Carmen Lupu Diana Constantinescu-Aruxandei Florin Oancea |
| author_facet | Daria Gabriela Popa Carmen Lupu Diana Constantinescu-Aruxandei Florin Oancea |
| author_sort | Daria Gabriela Popa |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T03:31:28Z |
| format | Article |
| id | doaj.art-068c55d3ae67497897f784b1c8ac80df |
| institution | Directory Open Access Journal |
| issn | 1660-3397 |
| language | English |
| last_indexed | 2024-03-10T03:31:28Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Marine Drugs |
| spelling | doaj.art-068c55d3ae67497897f784b1c8ac80df2023-11-23T11:54:39ZengMDPI AGMarine Drugs1660-33972022-05-0120532710.3390/md20050327Humic Substances as Microalgal Biostimulants—Implications for Microalgal BiotechnologyDaria Gabriela Popa0Carmen Lupu1Diana Constantinescu-Aruxandei2Florin Oancea3Faculty of Biotechnologies, University of Agronomic Sciences and Veterinary Medicine of Bucharest, Mărăști Blv, No. 59, Sector 1, 011464 Bucharest, RomaniaBioproducts Team, Bioresources Department, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independenței No. 202, Sector 6, 060021 Bucharest, RomaniaBioproducts Team, Bioresources Department, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independenței No. 202, Sector 6, 060021 Bucharest, RomaniaFaculty of Biotechnologies, University of Agronomic Sciences and Veterinary Medicine of Bucharest, Mărăști Blv, No. 59, Sector 1, 011464 Bucharest, RomaniaHumic 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.https://www.mdpi.com/1660-3397/20/5/327humic substancesmicroalgae cultivationhormetic effectsincreased nutrient availabilityimproved protection against abiotic stresshigher accumulation of bioactive ingredients |
| spellingShingle | Daria Gabriela Popa Carmen Lupu Diana Constantinescu-Aruxandei Florin Oancea Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology Marine Drugs humic substances microalgae cultivation hormetic effects increased nutrient availability improved protection against abiotic stress higher accumulation of bioactive ingredients |
| 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 | humic substances microalgae cultivation hormetic effects increased nutrient availability improved protection against abiotic stress higher accumulation of bioactive ingredients |
| url | https://www.mdpi.com/1660-3397/20/5/327 |
| work_keys_str_mv | AT dariagabrielapopa humicsubstancesasmicroalgalbiostimulantsimplicationsformicroalgalbiotechnology AT carmenlupu humicsubstancesasmicroalgalbiostimulantsimplicationsformicroalgalbiotechnology AT dianaconstantinescuaruxandei humicsubstancesasmicroalgalbiostimulantsimplicationsformicroalgalbiotechnology AT florinoancea humicsubstancesasmicroalgalbiostimulantsimplicationsformicroalgalbiotechnology |