Physiology of microalgae and their application to sustainable agriculture: A mini-review

Abstract

Concern that depletion of fertilizer feedstocks, which are a finite mineral resource, threatens agricultural sustainability has driven the exploration of sustainable methods of soil fertilization. Given that microalgae, which are unicellular photosynthetic organisms, can take up nutrients efficiently from water systems, their application in a biological wastewater purification system followed by the use of their biomass as a fertilizer alternative has attracted attention. Such applications of microalgae would contribute to the accelerated recycling of nutrients from wastewater to farmland. Many previous reports have provided information on the physiological characteristics of microalgae that support their utility. In this review, we focus on recent achievements of studies on microalgal physiology and relevant applications and outline the prospects for the contribution of microalgae to the establishment of sustainable agricultural practices.

Introduction

With the increasing threat of mineral resource depletion through human activities, demand for renewable feedstocks is rising dramatically. The utilization of photosynthetic organisms, including land plants and algae, offers one promising solution. For example, lignocellulosic biomass, which is composed predominantly of plant secondary cell walls, represents an abundant and renewable feedstock for materials, chemicals, and fuels (Ragauskas et al., 2014; Umezawa, 2018; Miyamoto et al., 2020). Promoting the applications of photosynthetic organisms would contribute to the establishment of a sustainable human society.

In the context of agricultural sustainability, a renewable alternative to synthetic chemical fertilizers is urgently required. Enhanced utilization of synthetic chemical fertilizers in conjunction with the development of modern crop cultivars, in which the yield is highly responsive to intensive fertilization, has contributed to improved crop productivity worldwide (Khush, 2001). For example, in soils a large portion of phosphorus (P), an essential macronutrient for plants, likely exists as non-available or poorly available forms for crops, which increases the importance of P fertilizer. However, because the raw material of P fertilizers, rock phosphate, is a finite resource distributed unevenly in limited areas of the world, depletion of the reserves is of grave concern (Desmidt et al., 2015). In addition, the manufacture of nitrogen (N) fertilizers requires the burning of fossil fuels to fix atmospheric N₂ and intensive use of N fertilizers enriches reactive N compounds, leading to soil acidification, water eutrophication, and atmospheric pollution (Hayashi et al., 2021). Thus, to establish a sustainable agricultural system worldwide, renewable alternatives to chemical fertilizers and the adoption of eco-friendly soil fertilization practices (Lin et al., 2019), as well as strategies to increase the nutrient use efficiency of crops (Hu et al., 2015; Wu et al., 2020; Ochiai et al., 2022), should be explored.

Microalgae are unicellular photosynthetic organisms commonly found in freshwater and marine ecosystems. They have been used in both experimental and real-world settings to biologically purify wastewater (Vadiveloo et al., 2021). Wastewater purification systems using microalgae represent a promising alternative to conventional wastewater treatment technologies that consume high amounts of energy, discharge sludge, and emit greenhouse gases (Qiao et al., 2020). Microalgae can rapidly grow and proliferate by efficiently acquiring carbon dioxide (CO₂) and nutrients, such as P and N, from water systems (Sukačová et al., 2020). Also, the use of microalgal biomass as a biofertilizer as well as a fuel resource can contribute to the enhanced recycling of nutrients (Das et al., 2019; Khan et al., 2019; Moges et al., 2020).

Previous works have revealed many physiological characteristics favorable to the use of microalgae in sustainable agriculture. In addition, empirical evidence on the effectiveness and characteristics of microalga-based fertilizers associated with their physiology has been reported. This review is focused on interactions between basic and applied studies of microalgae, providing insight into a strategy for the establishment of sustainable agriculture.

Carbon fixation capacity assisted by CO₂-concentrating mechanisms

The CO₂ assimilation capacity of photosynthetic organisms is critical to their growth. Ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) is a core enzyme involved in carbon fixation reactions. However, Rubisco generally shows a low affinity for CO₂ and the carboxylation reaction has a slow catalytic turnover rate. The oxygenase activity of Rubisco is also associated with CO₂-consuming photorespiration. These properties of Rubisco limit the efficiency of carbon fixation in photosynthetic organisms. In addition to the properties of Rubisco, aquatic conditions present further challenges for algal carbon fixation because the diffusion of CO₂ is substantially slower in water than in air. To overcome these problems, most algae develop CO₂-concentrating mechanisms (CCMs) that actively take up and enrich CO₂ and HCO₃^– in the pyrenoid, a chloroplast liquid-like non-membranous compartment rich in Rubisco (Hennacy and Jonikas, 2020). The pyrenoid of the algal model Chlamydomonas reinhardtii is penetrated by pyrenoid tubules, which are cylindrical structures of thylakoid membranes (Engel et al., 2015). The pyrenoid tubules may facilitate the rapid diffusion of small molecules, such as adenosine triphosphate (ATP) and sugars, between the chloroplast stroma and pyrenoid (Engel et al., 2015). A starch sheath composed of multiple starch granules forms around the pyrenoid in response to CO₂ limitation (Kuchitsu et al., 1988), which may prevent CO₂ diffusion from the pyrenoid.

Earlier reports on C. reinhardtii suggested that flexible CCM systems operate for adaptation to CO₂ limitation, i.e., low CO₂ (LC; approximately 0.03%–0.5%) and very low CO₂ (VLC; < 0.02%) environments (Wang and Spalding, 2014). Under LC conditions, CO₂ uptake mechanisms are predominantly activated. It has been suggested that the chloroplast protein limiting CO₂ inducible protein B (LCIB), which structurally resembles a β-type carbonic anhydrase (Jin et al., 2016), is indispensable for the stimulation of CO₂ uptake under LC conditions (Yamano et al., 2010; Wang and Spalding, 2014). It may be that LCIB captures CO₂ leaked from the pyrenoid by unidirectionally hydrating CO₂ to HCO₃^- under LC conditions (Yamano et al., 2022), though recombinant LCIB did not show carbonic anhydrase activity (Jin et al., 2016). LCIB proteins are dispersed uniformly in the chloroplast under LC conditions, whereas they migrate to the pyrenoid periphery under VLC conditions (Yamano et al., 2022). The starch sheath surrounding the pyrenoid is important in the localization of LCIB (Toyokawa et al., 2020). LCIB interacts with its homolog LCIC (Yamano et al., 2010). Additionally, LCIC accumulation is involved in LCIB migration (Yamano et al., 2022). These results suggest that an LCIB–LCIC complex plays a critical role in CCM regulation depending on the CO₂ concentration.

Although suppressed under LC conditions, HCO₃^– uptake is activated under VLC conditions. The ABC transporter high-light activated3 (HLA3) and anion channel LCIA, which are localized in the plasma membrane and chloroplast envelope, respectively, act cooperatively for the HCO₃^– uptake (Duanmu et al., 2009; Gao et al., 2015; Yamano et al., 2015).

It has been suggested that CCM-assisted carbon fixation is associated with nutrient availability (Raven et al., 2008). For example, a study using C. reinhardtii, Chlamydomonas acidophila, Chlamydomonas pitschmannii, and Scenedesmus vacuolatus observed different impacts of P limitation on their CCM, such as reduction of CO₂ and HCO₃^– uptake (Lachmann et al., 2017). Such impacts might be attributed to energy-demanding processes driven by ATP in the CCMs (Su, 2021). Therefore, P uptake capacity is also crucial for the growth performance of microalgae in water systems. In addition, the P content of microalgal biomass may directly affect its effectiveness as a fertilizer, which will be described further below.

Phosphorus accumulation associated with membrane lipid remodeling

Nutrient availability substantially affects microalgal growth and lipid metabolism. Owing to their utility for lipid production, interactions between nutrient acquisition and lipid metabolism in microalgae have been extensively studied (Moore et al., 2013; Yaakob et al., 2021). However, for microalgal application in a wastewater purification system followed by fertilizer use, the lipid-metabolism-dependent nutrient uptake capacity of microalgae is of greater interest.

P starvation induces membrane lipid remodeling from phospholipids (e.g., phosphatidylethanolamine, phosphatidylcholine, and phosphatidylglycerol) to non-P-containing glycolipids (e.g., sulfoquinovosyldiacylglycerol, SQDG) and/or betaine lipids (e.g., diacylglyceroltrimethylhomoserine, DGTS), thus facilitating P reallocation to other biochemical and cellular processes (Moseley and Grossman, 2009; Rouached et al., 2010). In Nannochloropsis oceanica, the breakdown of phospholipids and the synthesis of DGTS and SQDG are stimulated in the exponential growth phase under P limitation (Mühlroth et al., 2017). Additionally, acyl-editing-mediated conversion of phospholipids to non-P-containing lipids is upregulated in the stationary growth phase (Mühlroth et al., 2017).

The lipid-remodeling-associated P uptake capacity is different in taxonomically diverse microalgae. For example, high P uptake occurs in Nannochloropsis gaditana, Tetraselmis suecica, and Picochlorum atomus, which can actively counterbalance phospholipids with betaine (non-P-containing) lipids under P limitation (Cañavate et al., 2017a; Cañavate et al., 2017b). Meanwhile, such high P uptake is practically absent in Rhodomonas baltica, Chroomonas placoidea, and Chaetoceros gracilis, which constitutively produce betaine lipids with fluctuating abundances of phospholipids depending on P supply levels (Cañavate et al., 2017a; Cañavate et al., 2017b). The diversity may be associated with distinct strategies of microalgae for adaptation to P limitation. Microalgal species displaying a high capacity for P uptake might be useful for the applications in P recycling from wastewater to farmland.

Given that P limitation induces membrane lipid remodeling also in land plants (Nakamura, 2013; Tawaraya et al., 2018; Hayes et al., 2022), information on the molecular mechanisms involved in microalgal lipid remodeling may be beneficial to enhance our understanding of low-P adaptation in land plants. The MYB transcription factor phosphorus starvation response1 (PSR1), a homolog of Arabidopsis thaliana phosphate starvation response regulator1 (PHR1), acts as a crucial regulator of the acquisition and reallocation of P in C. reinhardtii (Shimogawara et al., 1999; Wykoff et al., 1999; Bajhaiya et al., 2016). In a N. oceanica mutant deficient in the gene encoding PSR1, low-P-induced replacement of phospholipids with DGTS and SQDG is not observed (Murakami et al., 2020), further supporting the association of PSR1 with low-P-induced membrane lipid remodeling in microalgal species. In addition, the MYB transcription factor lipid remodeling regulator1 (LRL1), a homolog of AtMYB65 from A. thaliana, upregulates the expression of the gene encoding sulfoquinovosyl diacylglycerol2 (SQD2) involved in SQDG biosynthesis at an advanced stage of the low-P response of C. reinhardtii (Hidayati et al., 2019).

Applications of microalgae for nutrient recycling

Given the aforementioned physiological characteristics that support biomass productivity and nutrient uptake capacity, microalgae are a viable renewable and eco-friendly alternative for conventional wastewater treatment systems (Table 1). For example, Chlorella vulgaris and Microcystis sp. can recover 33 mg P L^-1 (79%) and 37 mg P L^-1 (88%), respectively, from an initial concentration of 41 mg P L⁻¹ in wastewater in 14 days (Chu et al., 2021). With the escalation in the flow of P from terrestrial to water systems with increased industrialization (Liu et al., 2008; Schlesinger, 2012; Van Dijk et al., 2016), P recovery from wastewaters has become a mandatory practice (Peng et al., 2018). A large amount of P has been recovered annually from wastewater using microalgal biofilm techniques (Sukačová et al., 2020).

Further utilization of microalgal biomass recovered from wastewater treatment systems may facilitate the establishment of nutrient recycling (Table 2). The application of dried microalgal biomass can significantly increase total or plant-available nutrients (Dineshkumar et al., 2018; Dineshkumar et al., 2019; Saadaoui et al., 2019; Sharma et al., 2021) and organic carbon (Renuka et al., 2017) in soils. Deoiled dry biomass, which can be obtained as a residue of microalga-based oil production, improves crop productivity when used as a partial substitute for chemical fertilizers (Silambarasan et al., 2021). There are also reports on the positive effects of microalgal extracts and hydrolysates as a seed primer, foliar spray, and liquid fertilizer (Plaza et al., 2018; Kholssi et al., 2019; Supraja et al., 2020; Kusvuran, 2021). Interestingly, the potential of living microalgae to alleviate saline–alkaline stresses (Ma et al., 2022) and that of a soil-surface biofilm to suppress N loss through NH₃ volatilization (de Siqueira Castro et al., 2017) have been reported. Circular economy projects using microalgae for wastewater purification and farmland fertilization in a cattle farm (Lorentz et al., 2020) and winery company (Avila et al., 2022) have been tested.

It has also been reported that algal–bacterial aerobic granular sludge removes greater amounts of P and N from wastewater than does bacteria alone (Wang et al., 2021). Bacterial degradation of organic carbon may mitigate the issue of microalgal CO₂ acquisition in water systems, which was mentioned above. Additionally, the artificial augmentation of CO₂ in wastewater via supplementation with flue gas from combustion may also stimulate microalgal biomass productivity and nutrient uptake capacity, potentially resulting in enhanced nutrient recycling (He et al., 2012; Lara-Gil et al., 2016; Yadav et al., 2019).

Characteristics of microalga-based fertilizers

The application of dry biomass from Chlorella minutissima reduced the leaching of nitrate from farmland and increased leaf N content of spinach (Spinacia oleracea) plants (Sharma et al., 2022) (Table 2). The application of Asterarcys quadricellulare extracts significantly stimulated N assimilation and the nitrate reductase activity of potato (Solanum tuberosum) plants (Cordeiro et al., 2022). The applications of C. vulgaris biomass and chemical fertilizer resulted in comparable levels of shoot N uptake in wheat (Triticum aestivum) plants (Schreiber et al., 2018). These results demonstrate the effectiveness of the microalga-based fertilizer. However, the level of shoot P uptake was lower in the wheat plants grown under the microalgal treatment than in those grown under the chemical fertilizer treatment (Schreiber et al., 2018), suggesting that microalgal biomass acts as a slow-release P fertilizer. Microalgae can store P as polyphosphates (Delgadillo-Mirquez et al., 2016; Solovchenko et al., 2019; Chu et al., 2021), which are degraded slowly by soil microbes (Powell et al., 2011; Ray et al., 2013; Solovchenko et al., 2019). Furthermore, hydrothermal carbonization of microalgal biomass enhances its characteristics as a slow-release fertilizer, which increases the amount of moderately available P in soils more persistently compared with chemical fertilizer (Chu et al., 2021) (Table 2). Such fertilizer characteristics might increase the nutrient use efficiency of crops and/or reduce environmental pollution by suppressing the leaching of nutrients from farmland (Coppens et al., 2016; Jimenez et al., 2020; Sharma et al., 2022).

The application of microalgal extracts enriches essential macronutrients such as P, potassium, calcium, and magnesium in tomato plants (Suchithra et al., 2022) (Table 2). Microalga-based fertilizers also supply essential micronutrients as well as beneficial elements for plants (de Haes et al., 2012; Maurya et al., 2016; Wuang et al., 2016; Silva et al., 2019). In a wheat cultivation test, the application of microalgal biomass increased the contents of zinc, iron, copper, and manganese in plants (Rana et al., 2012; Prasanna et al., 2013; Renuka et al., 2017). Microalgal biomass rich in selenium, a beneficial element for plants, has been also suggested to serve as an effective fertilizer (Han et al., 2020).

Garcia-Gonzalez and Sommerfeld (2016) and Deepika and MubarakAli (2020) mentioned the occurrence in microalgal extracts of phytohormones that upregulate plant growth. It has been considered that microalgal components, including phytohormones, stimulate the production of antifungal substances in plants (Spolaore et al., 2006; Coppens et al., 2016). In addition, crude polysaccharides obtained from microalgae have a biostimulant-like effect on plants (Farid et al., 2019; Rachidi et al., 2020) (Table 2). Plant morphological traits, such as plant height, leaf number, tillering rate, root length, and lateral root number, are positively affected by the application of a microalga-based fertilizer depending on its dosage (Wuang et al., 2016; Nayak et al., 2019; Deepika and MubarakAli, 2020) (Table 2). Commercially important components of fruit, such as carotenoids and sugars, increase in response to the application of microalga-based fertilizers (Kumari et al., 2011; Coppens et al., 2016; Mutale-Joan et al., 2020; Cordeiro et al., 2022). These changes might be partially due to the effect of plant growth regulators in microalgal biomass, although further investigation is required for verification.

Conclusions and prospects

To achieve rapid growth and efficient nutrient accumulation in water systems, microalgae developed mechanisms such as flexible CCMs and membrane lipid remodeling. Previous research has shed light on the sophisticated molecular interactions underlying the physiological characteristics of microalgae, which support its utility as a wastewater purification system and fertilizer. Applications of microalgae in a wastewater purification system followed by fertilizer use may facilitate the establishment of nutrient recycling. Many studies have shown that application of microalgal biomass can provide nutrients essential for plants and enrich organic carbons in soils. In addition, microalgal biomass contains slowly degradable forms of plant-essential nutrients, reducing the leaching of the nutrients from farmland. Furthermore, microalga-based fertilizers are regarded as suppliers of plant growth regulators. However, challenges remain in the expansion of microalga-based technologies. For example, a life cycle assessment highlighted the detrimental impact of electricity consumption required for microalgal cultivation (Diniz et al., 2017; de Souza et al., 2019). In addition, the application of a microalga-based fertilizer can stimulate the emission of greenhouse gases, such as N₂O and CO₂, from soils (Suleiman et al., 2020). Thus, further technological advances, as well as a more in-depth understanding of microalgal physiology, are required for wider implementation of microalgal applications for sustainable agriculture.

Funding

This work was partially supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI grant (JP#22K14876).

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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