Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology

Popa, Daria Gabriela; Lupu, C.; Constantinescu-Aruxandei, Diana; Oancea, Florin

doi:10.3390/md20050327

Cited by 20 publications

(11 citation statements)

References 228 publications

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“…The pedo-climatic conditions and anthropogenic activities have a significant impact on the elemental composition and, as a result, the functional groups [52]. The bioactivity of HSs structures associated with their complexity has both been extensively discussed [4,14,17,20,[53][54][55]. The theories of HSs molecular and supramolecular structures have been established in recent investigations.…”

Section: Composition Extraction and Dimension Of Humic Substancesmentioning

confidence: 99%

“…Another paper labelled HSs as biostimulants for terrestrial photosynthetic organisms. Their effects on plants are related to specific HSs features such as: 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 [17]. Da Silva et al (2021) state that HSs are promising options for reducing the use of pesticides and mineral fertilizers [18].…”

Section: Introductionmentioning

confidence: 99%

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Humic Substances as a Versatile Intermediary

Hriciková

Kožárová

Hudáková

et al. 2023

Life

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Humic substances are organic ubiquitous components arising in the process of chemical and microbiological oxidation, generally called humification, the second largest process of the carbon cycle. The beneficial properties of these various substances can be observed in many fields of life and health, whether it is the impact on the human organism, as prophylactic as well as the therapeutic effects; animal physiology and welfare, which is widely used in livestock farming; or the impact of humic substances on the environment and ecosystem in the context of renewal, fertilization and detoxification. Since animal health, human health and environmental health are interconnected and mutually influencing, this work brings insight into the excellence of the use of humic substances as a versatile mediator contributing to the promotion of One Health.

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Section: Composition Extraction and Dimension Of Humic Substancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Humic Substances as a Versatile Intermediary

Hriciková

Kožárová

Hudáková

et al. 2023

Life

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“…Another kind of biostimulants are the humic substances (HS) that comprise humic and fulvic acids, and they are the main components of lignites, soil and peat ( Van Oosten et al., 2017 ). Humic substances are supramolecular structures with hydrophilic (-OH and -COOH groups) and hydrophobic portions, resulting from the association of small molecules by the decomposition processes of animals, plants, or from the metabolic activity of soil microbes ( Franzoni et al., 2022 ; Popa et al., 2022 ).…”

Section: Biostimulants: Definition Typeand Role In Agriculturementioning

confidence: 99%

Strategies and prospects for biostimulants to alleviate abiotic stress in plants

Freitas

Dias

2022

Front. Plant Sci.

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Global climate change-induced abiotic stresses (e.g., drought, salinity, extreme temperatures, heavy metals, and UV radiation) have destabilized the fragile agroecosystems and impaired plant performance and thereby reducing crop productivity and quality. Biostimulants, as a promising and eco-friendly approach, are widely used to address environmental concerns and fulfill the need for developing sustainable/modern agriculture. Current knowledge revealed that plant and animal derived stimulants (e.g., seaweeds and phytoextracts, humic substances, and protein hydrolysate) as well as microbial stimulants (e.g., plant beneficial bacteria or fungi) have great potential to elicit plant tolerance to various abiotic stresses and thus enhancing plant growth and performance-related parameters (such as root growth/diameter, flowering, nutrient use efficiency/translocation, soil water holding capacity, and microbial activity). However, to successfully implement biostimulant-based agriculture in the field under changing climate, the understanding of agricultural functions and action mechanism of biostimulants coping with various abiotic stresses at physicochemical, metabolic, and molecular levels is needed. Therefore, this review attempts to unravel the underlying mechanisms of action mediated by diverse biostimulants in relation to abiotic stress alleviation as well as to discuss the current challenges in their commercialization and implementation in agriculture under changing climate conditions.

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“…Biostimulants based on humic substances (HS) contain fulvic and/or humic acids, which are the major components of soil organic matter [58,72]. Humic substances biostimulants result from the decomposition processes of animals and plants, or the activity of soil microbes [48,73]. Humic substances are mostly composed of small amphitatic molecules that can form (supra)molecular aggregates in solution.…”

Section: Humic Substancesmentioning

confidence: 99%

Sustainable Olive Culture under Climate Change: The Potential of Biostimulants

et al. 2022

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Climatic extreme events, like droughts, heatwaves, and floods are becoming recurrent and represent a threat to agriculture, lowering plant growth and productivity. The Mediterranean region is a climate-change hotspot, where traditional agricultural systems, like olive groves, are particularly challenged. Both the traditional and intensive systems of olive culture coexist in the Mediterranean. Both systems differ in their demands for water and agrochemicals, but nowadays, the global inputs of agrochemicals and irrigation have increased to achieve high productivity and profitability. Finding sustainable alternatives to maintain high productivity under the ongoing climate change is urgent to meet the EU-Farm to Fork strategy and climate neutrality. Candidate eco-friendly alternatives include biostimulants. These are substances or microorganisms, that activate signaling cascades and metabolic processes, increasing plant yield, quality, and tolerance to stressors. These benefits include a better growth, nutritional status and water availability, leading to a decreased demand for irrigation and agrochemicals. In this review, we aim to present different types of biostimulants (e.g., seaweed, protein hydrolysates, humic substances, microorganisms and nanomaterials), their mode of action and benefits in agriculture. We also explore the current state-of-the-art regarding the use of biostimulants in olive culture, and their potential benefits to increase tolerance to (a)biotic challenges.

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Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology

Cited by 20 publications

References 228 publications

Humic Substances as a Versatile Intermediary

Humic Substances as a Versatile Intermediary

Strategies and prospects for biostimulants to alleviate abiotic stress in plants

Sustainable Olive Culture under Climate Change: The Potential of Biostimulants

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