Scenedesmus

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Scenedesmus
Scenedesmus bijunga EPA.jpg
Scenedesmus bijugus
Scientific classification OOjs UI icon edit-ltr.svg
(unranked): Viridiplantae
Division: Chlorophyta
Class: Chlorophyceae
Order: Sphaeropleales
Family: Scenedesmaceae
Genus: Scenedesmus
Meyen, 1829
Type species
Scenedesmus obtusus
Meyen, 1829
Species

Scenedesmus is a genus of green algae, in the class Chlorophyceae. They are colonial and non-motile. They are one of the most common components of phytoplankton in freshwater habitats worldwide. [1]

Taxonomy

The starting point of Scenedesmus and related algae is in 1820, when Pierre Jean François Turpin observed these algae under a microscope. He classified them under the diatom genus Achnanthes ; later authors moved them to different groups, until it was finally classified as a green alga. [1]

Currently, there are 74 taxonomically accepted species of Scenedesmus. [2] Additionally, several subgenera have been identified, but vary according to the source. Hegewald denotes Acutodesmus, Desmodesmus , and Scenedesmus as the three major categories. Acutodesmus is characterized as having acute cell poles, while Desmodesmus and Scenedesmus have obtuse/truncated cell poles (differentiated by the presence or absence of spines respectively). Fossil records date Scenedesmus from 70 to 100 million years ago with Desmodesmus suspected to be the youngest of these three groups. [1]

Basic biology

Scenedesmus is one of the most common freshwater algae genera; however, the extremely diverse morphologies found within species make identification difficult. [3] While most species are found across the world, certain species exist only in local populations such as S. intermedius and S. serratus which are found in New Zealand. [3]

Coenobia and cell growth

Scenedesmus can exist as unicells; they are also frequently found in coenobia of four or eight cells [3] inside a parental mother wall. Various coenobial architectures have been described, including linear, costulatoid, irregular, alternating, or dactylococcoid patterns (Figure 1). [3] The formation of coenobia is dependent on a number of factors. A higher proportion of unicellular organisms was found at high light intensities and high temperatures, suggesting that at higher growth rates the organisms prefer to be non-colonized. [3] Successful growth and division for algae relies on a balance between maintaining buoyancy in the euphotic zone (containing ideal light and nutritional conditions) and avoidance of grazing predators. [3] Larger colonies have a smaller surface-to-volume ratio, which limits nutrient uptake and light harvesting, and the large mass promotes sinking. However, in the presence of grazers, such as Daphnia , that threaten to consume unicellular algae, the larger colonies provide significant security. [3] This threat can be so significant that the cells will coalesce into these eight-cell colonies even in severely limiting growth conditions in order to reduce grazing vulnerability or while in nutrient-deplete conditions. [3] [4]

Defense mechanisms

The cells have other mechanisms of self-defense in addition to colonizing. Scenedesmus can be divided into two subgenera, the non-spiny Scenedesmus and the spiny Desmodesmus. Although spineless, the Scenedesmus subgenera cells have thick cells walls and mucilage, which may make them digestion-resistant. Some chemical compounds in Scenedesmus could even be toxic to certain organisms upon consumption. Bristles of up to 100 μm may form a net in both spiny and non-spiny varieties to discourage predation even further. [3] Cells defensively form these bristles when kairomones are detected, an infochemical released by Daphnia that Scenedesmus has evolved to recognize as a warning signal. [3] [4]

Reproduction and colony formation

During replication, the mother cell enlarges and becomes multinucleate after multiple divisions. The cytoplasm then is cleaved into uninucleate daughter cells, usually developing as non-motile autospores. These daughter cells typically link up with other daughter cells to form a colony within the parental cell wall to be later released. [5] The cells progress through a typical mitotic cycle similar to other members of Chlorophyceae, with the cytoplasm of the daughter cells becoming very dense. [5] Eventually the mother cell wall breaks and releases the spores which adopt a normal cellular appearance. [5] The cells at either end of the coenobium are different in morphology from those in the center. [5] How the cells adhere to one another during development is still unclear, but it is known that a trilaminar sheath (TLS), composed of algaenan, is one of the first exterior structures to form, developing in patches before growing to connect into one continuous layer. [5] The ornamented layer is the last component to develop. [5]

Cell ornamentation and outer layers

The exterior ornamentation is highly variable within the genus Scenedesmus. Staehelin et al. characterized two species in detail: S. pannonicus and S. longus. S. pannonicus assembles a tight-fitting "warty" layer compared to the loose "reticulate" layer found on S. longus. [6] A shared feature between the two is a TLS found at the junction between neighboring cells that helps cement them together. [6] An additional pectic layer observed on S. pannonicus forms a thick mesh of thin filaments originating from the warty layer. [6] Another feature of the outer coenobial surface of S. pannonicus is a combination of individual spikes (seemingly connected to the warts) and small spikelets that fuse to form combs that zigzag along the cell. [6] An overview of these structures can be seen in Figure 2. The last major category of ornamentation is rosettes that are common to many Scenedesmus species. [6] Rosettes are ring-shaped structures enclosing small mounds on the cell surface and are usually sitting upon a thicker layer of cell wall than the surrounding areas. [6] No potential function for these structures has been suggested. While S. longus was not observed with the comb-like structures of S. pannonicus, it did have two variations of spikelets forming between the TLS and reticulate layer to keep the two apart. [6]

Mitochondrial DNA

Scenedesmus obliquus is notable for the non-standard coding of its mitochondrial DNA which may represent an intermediate form in the evolution of green algal mitochondrial DNA. [7] This code is represented by NCBI translation table 22, Scenedesmus obliquus mitochondrial code. [8]

Biofuel production

Although Scenedesmus is capable of producing many kinds of biofuels such as biohydrogen, biodiesel, bioethanol and drop-in fuels, most extensive research has been done on the use of Scenedesmus for biodiesel production. Like all algae systems, the implementation of integrated biofuel production of Scenedesmus from the laboratory findings has challenges in large-scale production. Major challenges include nutrient supply and recycling, gas transfer and exchange, PAR (Photosynthetically Active Radiation) delivery, cultural integrity, environmental control, land and water availability, harvesting, and genetic and metabolic engineering [9]

Biohydrogen (H2) production

In 1942, Gaffron and Rubin may be credited with conducting an experiment that sparked H2 production research in green algae using Scenedesmus obliquus. [10] Algae produce H2 gas under anaerobic conditions by providing hydrogenases with hydrogen ions derived from splitting of water molecules via photosynthesis. [11] However, enzyme activity is transient due to inhibition from O2 production via photosynthesis, a problem that continues to plague H2 production. [12] S. obliquus is traditionally known to utilize a nickel-iron hydrogenase, but usage of other iron hydrogenases in H2 production is also reported. [13] Hydrogenase enzyme activity in Scenedesmus species is reported to be lower than that of Chlamydomonas reinhardtii. [14] H2 production independent of Photosystem II in Scenedesmus has also been performed using redox equivalents of fermentative metabolism under dark anaerobic incubation. [10] [15] Research findings suggest that a sulfur-deprived environment triggers an imbalance in the photosynthesis and respiration relationship, resulting in net consumption of O2, causing anaerobiosis, and switching to hydrogen production. [12] Ultrasonication pretreatment has been effective in increasing fermentative bioenergy production from Scenedesmus oliquus YSW15. [16] Biohydrogen production research using Scenedesmus is actively spurred by its applications to wastewater treatment. (See subsequent section on waste management by Scenedesmus).

Biodiesel production

Scenedesmus is known to have high biomass productivity among green algae, and has been actively researched for its use for biodiesel production. Its heterotrophic production of biomass and lipid in optimized conditions is reported to have higher efficiency than its autotrophic production. [17] [18] [19] [20] Optimization of biomass productivity as well as lipid content through varying concentration of supplemental nutrients has been done in numerous studies; currently, Scenedesmus lipid yield after optimization has reached ~60% dry cell weight, lower than some other algae. [18] [21] However, Scenedesmus is more efficient at capturing CO2 than other algae. [20] Like many algae species, Scenedesmus required nitrate-deficient condition to profoundly increase its lipid yield. [22] A significant improvement (up to six-fold) of feedstock yields was achieved by adding varying concentrations of ethanol under a 12-hour photoperiod and in the dark. [22] Under salinity stress via two-stage cultivation, Scenedesmus sp. BHU1 enhances both biomass productivity and lipid content. [23] The most significant improvement in lipid production was obtained when stationary phase cultures were transferred to media deficient in nitrate for 7 days and phosphate for 3 days, respectively. [18] Extraction of oils with methanol or ethanol from the Scenedesmus remains a challenge and its lower lipid content adds to the cost of production. [18] In a recent study, [24] Scenedesmus abundans was isolated from Dal Lake, Kashmir and proved to be a suitable raw material for biodiesel production. The alga increased significantly in biomass and lipid content with the nitrogen concentration of 0.32 g/L of nitrogen. A two-step transesterification was found to be best suited for transesterification, while Folch extraction was best for lipid extraction. [24]

Bioethanol

Scenedesmus, and other microalgae such as Chlorella, Dunaliella, Chlamydomonas, and Spirulina, contain large amounts of carbohydrate (>50% of the dry weight), which make them attractive candidates for bioethanol production. [25] In one study, [26] Scenedesmus was used to yield high biomass productivity; its carbohydrate-rich biomass was then hydrolyzed with 2% sulfuric acid and underwent an SHF (Separate Hydrolysis and Fermentation) process to produce 8.55 g L−1 of ethanol and a maximum yield of 0.213 g ethanol / g biomass within 4 hours of ethanol fermentation.

Drop-in fuels

Isoprenoids are considered important metabolites that can be utilized as drop-in fuels, often as alkane chains. Scenedesmus conducts a pyruvate/glyeraldehyde 3-phosphate non-mevalonate pathway to synthesize isoprenoids. However, isoprenoid yields were too low (1.5~15 mg per 10 liter of Scenedesmus culture when cells reached 0.5-0.6 g L−1) to be considered viable for future drop-in fuel production. [27]

Wastewater management

Scendesmus species are often able to grow in wastewater or other side streams and are thus regularly cultivated in such streams. [28] [29] [30] [31] In a study comparing the efficiency of ammonia and phosphorus removal from an agroindustrial wastewater by Chlorella vulgaris and Scenedesmus dimorphus, Scenedesmus exhibited better efficiency of removing ammonia in cylindrical bioreactor while both algae removed phosphorus from the wastewater to the same extent. [32] Algal Turf Scrubber (ATS) is one of many technologies that utilize algae for treating variety of wastes and industrially polluted waters. [33] An algal turf scrubber in Florida, for example, removed phosphorus at a cost of $24 per kg whereas engineered wetland processes removed phosphorus at a cost of $77 per kg. While removing metallic wastes as well as organic substrates, growing Scenedesmus biomass could be utilized for producing cattle feeds, organic fertilizers, paper, construction paper, and biodiesel. [9]

Related Research Articles

<span class="mw-page-title-main">Biofuel</span> Type of biological fuel

Biofuel is a fuel that is produced over a short time span from biomass, rather than by the very slow natural processes involved in the formation of fossil fuels such as oil. Biofuel can be produced from plants or from agricultural, domestic or industrial biowaste. Biofuels are mostly used for transportation, but can also be used for heating and electricity. Biofuels are regarded as a renewable energy source. The use of biofuel has been subject to criticism regarding the "food vs fuel" debate, varied assessments of their sustainability, and possible deforestation and biodiversity loss as a result of biofuel production.

<span class="mw-page-title-main">Biorefinery</span> Refinery that converts biomass to energy and other beneficial byproducts

A biorefinery is a refinery that converts biomass to energy and other beneficial byproducts. The International Energy Agency Bioenergy Task 42 defined biorefining as "the sustainable processing of biomass into a spectrum of bio-based products and bioenergy ". As refineries, biorefineries can provide multiple chemicals by fractioning an initial raw material (biomass) into multiple intermediates that can be further converted into value-added products. Each refining phase is also referred to as a "cascading phase". The use of biomass as feedstock can provide a benefit by reducing the impacts on the environment, as lower pollutants emissions and reduction in the emissions of hazard products. In addition, biorefineries are intended to achieve the following goals:

  1. Supply the current fuels and chemical building blocks
  2. Supply new building blocks for the production of novel materials with disruptive characteristics
  3. Creation of new jobs, including rural areas
  4. Valorization of waste
  5. Achieve the ultimate goal of reducing GHG emissions

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<span class="mw-page-title-main">Biohydrogen</span> Hydrogen that is produced biologically

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<span class="mw-page-title-main">Selenastraceae</span> Family of algae

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References

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  2. ↑ M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 16 April 2015.
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  13. ↑ Florin, Lore, Anestis Tsokoglou, and Thomas Happe. "A Novel Type of Iron Hydrogenase in the Green Alga Scenedesmus obliquus is Linked to the Photosynthetic Electron Transport Chain." Journal of Biological Chemistry276.9 (2001): 6125-6132.
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  15. ↑ Das Debabrata; Veziroǧlu T. Nejat (2001). "Hydrogen production by biological processes: a survey of literature". International Journal of Hydrogen Energy. 26 (1): 13–28. doi:10.1016/s0360-3199(00)00058-6.
  16. ↑ Choi, Jeong-A., et al. "Enhancement of fermentative bioenergy (ethanol/hydrogen) production using ultrasonication of Scenedesmus obliquus YSW15 cultivated in swine wastewater effluent." Energy & Environmental Science (2011); 4(9): 3513-3520.
  17. ↑ El-Sheekh, Mostafa, Abd El-Fatah Abomohra, and Dieter Hanelt. "Optimization of biomass and fatty acid productivity of Scenedesmus obliquus as a promising microalga for biodiesel production." World Journal of Microbiology and Biotechnology (2012): 1-8.
  18. 1 2 3 4 Mandal Shovon, Mallick Nirupama (2009). "Microalga Scenedesmus obliquus and a potential source for biodiesel production". Applied Microbiology and Biotechnology. 84 (2): 281–291. doi:10.1007/s00253-009-1935-6. PMID   19330327. S2CID   24837468.
  19. ↑ da Silva, Teresa Lopes, et al.; "Oil production towards biofuel from autotrophic microalgae semicontinuous cultivations monitorized by flow cytometry." Applied biochemistry and biotechnology 159.2 (2009): 568-578.
  20. 1 2 Yoo Chan; et al. (2010). "Selection of microalgae for lipid production under high levels carbon dioxide". Bioresource Technology. 101 (1): S71–S74. doi:10.1016/j.biortech.2009.03.030. PMID   19362826.
  21. ↑ Banerjee, Anirban, et al. "Botryococcus braunii: a renewable source of hydrocarbons and other chemicals." Critical reviews in biotechnology 22.3 (2002): 245-279.
  22. 1 2 Wu, Chengchen, et al. "Enhancement Effect of Ethanol on Lipid and Fatty Acid Accumulation and Composition of Scenedesmus sp." Bioresource Technology (2013).
  23. ↑ Singh, R.P., Yadav, P., Kumar, A., Hashem, A., Avila-Quezada, G.D., Abd_Allah, E.F. and Gupta, R.K., 2023. Salinity-Induced Physiochemical Alterations to Enhance Lipid Content in Oleaginous Microalgae Scenedesmus sp. BHU1 via Two-Stage Cultivation for Biodiesel Feedstock. Microorganisms, 11(8), p.2064.
  24. 1 2 Mandotra S.K., Kumar Pankaj, Suseela M.R., Ramteke P.W. (2014). "Fresh water green microalga Scenedesmus abundans: A potential feedstock for high quality biodiesel production". Bioresource Technology. 156: 42–47. doi:10.1016/j.biortech.2013.12.127. PMID   24486936.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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  26. ↑ Ho, Shih-Hsin, et al. "Bioprocess development on microalgae-based CO 2 fixation and bioethanol production using Scenedesmus obliquus CNW-N." Bioresource Technology (2013).
  27. ↑ Schwender, J., et al. "Biosynthesis of isoprenoids (carotenoids, sterols, prenyl side-chains of chlorophylls and plastoquinone) via a novel pyruvate/glyceraldehyde 3-phosphate non-mevalonate pathway in the green alga Scenedesmus obliquus." Biochemical Journal 316.Pt 1 (1996): 73.
  28. ↑ Oliveira, Ana Cristina; Barata, Ana; Batista, Ana P.; Gouveia, Luísa (19 December 2019). "Scenedesmus obliquus in poultry wastewater bioremediation". Environmental Technology. 40 (28): 3735–3744. doi:10.1080/09593330.2018.1488003. hdl: 10400.9/3072 . PMID   29893195. S2CID   48355209.
  29. ↑ Schoeters, Floris; Thoré, Eli S. J.; De Cuyper, Audrey; Noyens, Isabelle; Goossens, Sarah; Lybaert, Sander; Meers, Erik; Van Miert, Sabine; de Souza, Marcella Fernandes (12 December 2022). "Microalgal cultivation on grass juice as a novel process for a green biorefinery". Algal Research. 69: 102941. doi: 10.1016/j.algal.2022.102941 . hdl: 1854/LU-01GSF6YKRK642A1S9980ARW11R . ISSN   2211-9264.
  30. ↑ Sánchez-Zurano, Ana; Lafarga, Tomás; Morales-Amaral, María del Mar; Gómez-Serrano, Cintia; Fernández-Sevilla, José María; Acién-Fernández, Francisco Gabriel; Molina-Grima, Emilio (1 December 2021). "Wastewater treatment using Scenedesmus almeriensis: effect of operational conditions on the composition of the microalgae-bacteria consortia". Journal of Applied Phycology. 33 (6): 3885–3897. doi:10.1007/s10811-021-02600-2. hdl: 10835/13315 . ISSN   1573-5176. S2CID   240509916.
  31. ↑ Sánchez-Zurano, Ana; Morillas-España, Ainoa; Gómez-Serrano, Cintia; Ciardi, Martina; Acién, Gabriel; Lafarga, Tomás (4 November 2021). "Annual assessment of the wastewater treatment capacity of the microalga Scenedesmus almeriensis and optimisation of operational conditions". Scientific Reports. 11 (1): 21651. Bibcode:2021NatSR..1121651S. doi: 10.1038/s41598-021-01163-z . ISSN   2045-2322. PMC   8569198 . PMID   34737353.
  32. ↑ González , Estela Luz, Olivia Cañizares Rosa, Baena Sandra (1997). "Efficiency of ammonia and phosphorus removal from a Colombian agroindustrial wastewater by the microalgae Chlorella vulgaris and Scenedesmus dimorphus". Bioresource Technology. 60 (3): 259–262. CiteSeerX   10.1.1.316.6465 . doi:10.1016/s0960-8524(97)00029-1.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  33. ↑ ":: The Algal Turf Scrubber ::". Archived from the original on 2015-04-25. Retrieved 2015-05-04.
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