Effect of Humic Acids from Biomass Biostimulant on Microalgae Growth

Faraon, Victor Alexandru; Popa, Daria Gabriela; Tudor-Popa, Ioana; Mihăilă, Eliza Gabriela; Oancea, Florin

doi:10.3390/chemproc2022007051

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…The mirror concept of "microalgae biostimulants" is still new and not yet largely used. Our group described as "microalgae biostimulants" the humic acids [98,99] and selenium-betaine combination [100] that determine microalgae effects analog to those exerted by plant biostimulants on crops. An international group centered at Malaysian universities utilizes the term "microalgae biostimulants" to describe the effects of feather hydrolysate [101] and antioxidant extract from onion peels [102] on microalgae.…”

Section: Discussionmentioning

confidence: 99%

Novel Strigolactone Mimics That Modulate Photosynthesis and Biomass Accumulation in Chlorella sorokiniana

Popa,

Georgescu,

Dumitrascu

et al. 2023

Molecules

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In terrestrial plants, strigolactones act as multifunctional endo- and exo-signals. On microalgae, the strigolactones determine akin effects: induce symbiosis formation with fungi and bacteria and enhance photosynthesis efficiency and accumulation of biomass. This work aims to synthesize and identify strigolactone mimics that promote photosynthesis and biomass accumulation in microalgae with biotechnological potential. Novel strigolactone mimics easily accessible in significant amounts were prepared and fully characterized. The first two novel compounds contain 3,5-disubstituted aryloxy moieties connected to the bioactive furan-2-one ring. In the second group of compounds, a benzothiazole ring is connected directly through the cyclic nitrogen atom to the bioactive furan-2-one ring. The novel strigolactone mimics were tested on Chlorella sorokiniana NIVA-CHL 176. All tested strigolactones increased the accumulation of chlorophyll b in microalgae biomass. The SL-F3 mimic, 3-(4-methyl-5-oxo-2,5-dihydrofuran-2-yl)-3H-benzothiazol-2-one (7), proved the most efficient. This compound, applied at a concentration of 10−7 M, determined a significant biomass accumulation, higher by more than 15% compared to untreated control, and improved the quantum yield efficiency of photosystem II. SL-F2 mimic, 5-(3,5-dibromophenoxy)-3-methyl-5H-furan-2-one (4), applied at a concentration of 10−9 M, improved protein production and slightly stimulated biomass accumulation. Potential utilization of the new strigolactone mimics as microalgae biostimulants is discussed.

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Section: Discussionmentioning

confidence: 99%

Novel Strigolactone Mimics That Modulate Photosynthesis and Biomass Accumulation in Chlorella sorokiniana

Popa,

Georgescu,

Dumitrascu

et al. 2023

Molecules

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“…The initial driver of studying the HS effects on microalgae was an ecotoxicological one. Due to the growing interest in carbon sequestration by microalgae, HS has been proposed as a biostimulant for microalgae in recent years [ 56 , 57 ].…”

Section: Introductionmentioning

confidence: 99%

Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology

Popa

Lupu

Constantinescu-Aruxandei

et al. 2022

Marine Drugs

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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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Effect of Humic Acids from Biomass Biostimulant on Microalgae Growth

Cited by 2 publications

References 3 publications

Novel Strigolactone Mimics That Modulate Photosynthesis and Biomass Accumulation in Chlorella sorokiniana

Novel Strigolactone Mimics That Modulate Photosynthesis and Biomass Accumulation in Chlorella sorokiniana

Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology

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