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Gonzalez-Pimentel, J.L.; Martin-Pozas, T.; Jurado, V.; Laiz, L.; Fernandez-Cortes, A.; Sanchez-Moral, S.; Saiz-Jimenez, C. Marine Bacterial Genus Euzebya in Terrestrial Environments. Encyclopedia. Available online: https://encyclopedia.pub/entry/51033 (accessed on 04 September 2024).
Gonzalez-Pimentel JL, Martin-Pozas T, Jurado V, Laiz L, Fernandez-Cortes A, Sanchez-Moral S, et al. Marine Bacterial Genus Euzebya in Terrestrial Environments. Encyclopedia. Available at: https://encyclopedia.pub/entry/51033. Accessed September 04, 2024.
Gonzalez-Pimentel, Jose Luis, Tamara Martin-Pozas, Valme Jurado, Leonila Laiz, Angel Fernandez-Cortes, Sergio Sanchez-Moral, Cesareo Saiz-Jimenez. "Marine Bacterial Genus Euzebya in Terrestrial Environments" Encyclopedia, https://encyclopedia.pub/entry/51033 (accessed September 04, 2024).
Gonzalez-Pimentel, J.L., Martin-Pozas, T., Jurado, V., Laiz, L., Fernandez-Cortes, A., Sanchez-Moral, S., & Saiz-Jimenez, C. (2023, November 01). Marine Bacterial Genus Euzebya in Terrestrial Environments. In Encyclopedia. https://encyclopedia.pub/entry/51033
Gonzalez-Pimentel, Jose Luis, et al. "Marine Bacterial Genus Euzebya in Terrestrial Environments." Encyclopedia. Web. 01 November, 2023.
Marine Bacterial Genus Euzebya in Terrestrial Environments
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This entry is adapted from the peer-reviewed paper 10.3390/app13179644

Euzebya and other haloalkaliphilic bacteria can thrive under harsh conditions, such as high concentrations of sodium and/or calcium, high electric conductivity and alkaline pH, highly variable temperatures, and water fluctuations. These conditions are quasi-extreme in the studied terrestrial environments. 

biofilms caves soils Euzebya

1. Introduction

In terms of microbial diversity, the oceans represent the largest biosphere habitat, containing about 70% of the prokaryotic biomass [1]. In recent decades, interest in the bioactive compounds from marine bacteria has grown enormously [2][3][4][5][6][7][8], and many works have focused on rare marine Actinomycetota [9][10][11][12][13]. One of the most intriguing and rare genera of marine Actinomycetota is Euzebya. No terrestrial Euzebya has been isolated so far.
The genus Euzebya was described by Kurahashi et al. [14] to accommodate a Gram-positive actinobacterial strain isolated from the epidermis of Holothuria edulis, a sea cucumber collected in the Sea of Japan. The strain was characterized by a reddish-orange or tangerine color and was able to grow in sodium chloride concentrations of 0.5–12%, but no growth was observed in the absence of sodium chloride or at a concentration of 15%. Optimal growth temperatures were in the range of 20–28 °C and pH 7–9. No growth was obtained at pH 6 or 10. The type strain is Euzebya tangerina from the new order Euzebyales and the new family Euzebyaceae [14]. A second member of the genus, Euzebya rosea, was isolated from the waters of the East China Sea and showed a light pink color, optimal growth at 25–30 °C, and pH 6–7. Optimal sodium chloride concentrations were 1–4% [15].
Euzebya pacifica was the third species of the genus, isolated from seawater collected at 150 m depth in the Eastern Pacific Ocean [16]. Colonies were pink, with optimal growth at 30–35 °C, in sodium chloride concentrations of 1–2%, and pH 6.5. This last species could grow in the absence of sodium chloride. The complete genome sequence of E. pacifica revealed its ecological roles in marine carbon, nitrogen, phosphorus, and sulfur cycles [17]. In general, the three marine species of Euzebya are characterized by their tolerance to relatively high sodium chloride concentrations, growth at neutral pH (7), and temperatures from 20 to 35 °C.
The advent of molecular tools, particularly next-generation sequencing (NGS), has dramatically changed the knowledge of the diversity of microbial life on Earth. In recent decades, many studies on different terrestrial environments, including caves [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], have described the diversity and abundance of Euzebyales/Euzebyaceae/Euzebya; however, as far as we know, no Euzebya isolates have been obtained from terrestrial niches.

2. Metagenomic Detection of Euzebya in the Environment: Caves

Caves are mineral environments, often oligotrophic in nature. Rocks, speleothems, and mineral deposits, such as moonmilk, are colonized by microbial communities, which develop as colored biofilms [18][19][20]. To our knowledge, the first report on the occurrence of Euzebya in caves was in a study by Cuezva et al. [18]. In Altamira Cave, Spain, sequences with 82–92% similarity to the nearest relative Euzebya tangerina were retrieved from grey biofilms, suggesting that they probably represented an unknown species. Euzebya represented 72.8% of the clones retrieved from the grey biofilms [18]. Riquelme et al. [19] recovered representatives of Euzebyales from colored microbial mats found in volcanic caves in the Azores, Hawai’i, and New Mexico, and stated that the different clades obtained suggested a significant diversity within the sequences found. Other papers reported Euzebya sequences from caves in different geographical regions [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].
The composition of microbial communities was found to be dependent on geochemical and microclimatic parameters. In this context, Frazier [29] reported the high relative abundance of Euzebya (up to 30.7%) in one cave and its negligible occurrence (up to 0.2%) in another cave from mineralogically similar formations located 65 km apart. The difference in abundance was attributed to flooding and clay deposition in the Euzebya-rich cave.
A recent study was conducted on the biofilms present in Covadura Cave, located in the gypsum karst of Sorbas, Almeria, Spain. The karst comprises over 100 km of passages within the six most important caves (Covadura Cave, GEP Complex, C3 Cave, Gypsum Cave, Treasure Cave, and Water Cave), which are subject to condensation–dissolution mechanisms. Water condensation on the cooler walls of Covadura Cave takes place mainly during the dry period (July to October) and the biofilms show water droplets on their surface. Biofilm proliferation has been associated with the strong condensation existing in some caves [36], as condensation favors the colonization of cave walls by microorganisms [18][19].

The data revealed that Euzebyaceae were abundant in Covadura Cave white biofilms collected in 2010, but their relative abundance was drastically reduced in the 2022 sampling. This could be associated with the severe droughts, the last of which occurred between 2017 and 2018, and which continue until now. In the yellow biofilms, the decrease in abundance of Euzebyaceae was lower.

Euzebya was also abundant in volcanic caves. The genus was found in caves in the Azores, Canary Islands, Galapagos, Hawai’i, Idaho, Tennessee, and Mexico [19][20][24][26][28][29][30][34]. Gonzalez-Pimentel et al. [24] stated that yellow biofilms from a cave on the Canary Island of La Palma were dominated by metabolically active Euzebya (43.9% RNA clones vs. 26.0% DNA clones).

3. Euzebyales in Extreme Environments

Saline and hypersaline terrestrial environments include salt mines, sediments of desiccated salt lakes, saline and alkaline soils, salt marshes, etc. These environments often have salt concentrations higher than that of seawater and support halophilic microorganisms that have adapted to deal with extreme environmental parameters (high salt concentrations, temperatures, and pH), although their community composition and structure vary depending on salinity fluctuations in the environment [37].
The occurrence of Euzebya in these environments has been reported in numerous studies [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53], denoting the ability of the members of this genus to prosper in habitats with high salt concentrations.
Interestingly, the wide occurrence of Euzebya and its haloalkaliphilic relatives has been registered in the drained sediments of former Mexican lakes (Texcoco and Rincon de Parangueo) [38][43], and the Songnen Plain of Northeast China, one of the three regions with extensive saline–sodic soils in the world [48][49][50][51].
The Texcoco Lake sediments are characterized by a very high pH (10) and an electric conductivity (EC) of up to 179.8 dS m−1 [38][40][42]. There, Euzebya was one of the dominant bacterial genera with relative abundances >10% [40]. It has been reported that organic carbon additions to the sediments increased Euzebya abundance [40].
In the Songnen Plain of Northeast China, with very high pH (>10) and high EC, Euzebya showed high relative abundance [48][50], as well as a high sodicity/salinity niche preference, however, the genus was depleted or absent when sodicity/salinity decreased [49].

Deserts, cover around 33% of the planet’s surface. The use of molecular tools (NGS) revealed dominant members of the extremophilic microbial communities that have not been yet isolated. They included Euzebya, both in cold environments (Antarctica) and hot deserts (Atacama, Sahara, Colorado Plateau, etc.) [54][55][56][57][58][59][60][61][62][63][64][65].

Euzebya was one of the most frequently detected genera in Australian and Northern Antarctica soils. There, Actinomycetota diversity increased with increasing pH and sodium concentration, and this applies particularly to Euzebya [58].
The McMurdo Dry Valleys is the largest ice-free soil region in Antarctica. There, Euzebyales were abundant only in the soil samples with moisture below 6.82% but largely declined or were absent in the soil with moisture content above 15.57% [56]. In Victoria Valley, within McMurdo Dry Valleys, two families, Euzebyaceae and Rubrobacteraceae, were abundant (over 30%) in endolithic niches and less frequent in soils. It has been reported that water availability largely conditioned the distribution of these actinobacterial families [57].

4. Euzebyales in Soils and Other Diverse Environments

Euzebya was found in the rhizosphere of Agave lechuguilla in the saline and oligotrophic soils of Cuatro Ciénegas Basin, Mexico [66][67], as well as in other plant rhizospheres from different regions [67][68][69][70][71][72][73][74].
Euzebya is represented in soils all over the world [75][76][77][78][79][80][81][82][83][84][85][86]. Several authors have reported the occurrence of Euzebya in clean and healthy soils and its absence in polluted soils [76][87][88]. However, Euzebya has also been found in bauxite residue disposal areas and copper mine wastes [89][90][91][92].
The presence of Euzebya has been recorded in saltern and salt lakes, terrestrial and sea waters, marine organisms [93][94][95][96][97][98][99][100], bentonite [101], animals [102][103][104], and humans [105][106][107]. In addition, the genus was found on a sandstone surface, covered by efflorescences, at the Wawel Royal Castle in Poland [108].

5. Relationship of Euzebyales with Other Members of Microbial Communities in Diverse Environments

A review of all the reports available in the literature provided some insights into the relationship of Euzebya with other taxa in different environments. In fact, several taxonomic groups may inhabit the same niche as Euzebya. Thus, Euzebya is present in most caves together with Crossiella, Rubrobacter, wb1-P19 (Nitrosococcales), and Gaiella, among other genera [19][21][23][27][28][29][33][34][35][36]. Caves are characterized by high relative humidity, in most cases near saturation, high mineral concentration, mainly of calcite in karstic and basaltic rocks in volcanic caves, as well as alkaline pH. In some pristine caves, oligotrophy is an environmental constraint.
In saline and hypersaline environments, the order Euzebyales is accompanied by other orders common to these extreme environments, such as Nitriliruptorales, Rubrobacterales, Solirubrobacterales, Gaiellales, Acidimicrobiales, Oceanospirillales, Rhizobiales, KSA1 (Bacteroidetes), etc. [39][40][43][47][48][49][50][51]. Most members of these orders require high pH and salt concentrations, and oligotrophy is common in these environments.
In deserts, Euzebya has been found together with Nitriliruptor, Rubrobacter, Solirubrobacter, Gaiella, Halomonas, etc. [55][57][58][61][62][63][64]. Water availability is scarce in deserts and environmental conditions become more challenging (e.g., strong oligotrophy and high mineral deposits). Most of these genera are known for their ability to resist extreme desiccation, high UV and ionizing radiation, temperature fluctuations, and high salinity and metal concentrations [55].
In soils, the co-occurrence of Euzebyales with Nitriliruptorales, Rubrobacterales, Solirubrobacterales, Gaiellales, Oceanospirillales, Rhizobiales, etc., is frequently reported [81][82][83][109][110], as previously stated for caves, saline, hypersaline, and desert environments.
To summarize, some microbial lineages present in harsh terrestrial environments show successful adaptation strategies and the ability to cope with available scarce nutrient sources in unfavorable climatic and geochemical conditions.

6. Culture Media for the Isolation of Euzebya in Terrestrial Environments

The terrestrial environments where Euzebya have been found are characterized by haloalkaliphilic conditions, high pH (9–10), and high to moderate salt contents. The availability of water in these ecosystems is widely variable, from dry conditions to 100% relative humidity, which suggests the great adaptability of this genus. In addition, the range of mean temperatures of these environments is highly variable, from −30 °C (winter in McMurdo Dry Valleys) to >40 °C in deserts, with large daily temperature fluctuations in each location.
The culture media used by different authors contained a wide array of carbon and nitrogen sources (peptone, tryptone, starch, tyrosine, glycerol, asparagine, sodium caseinate, malt extract, humic acid, glucose, oatmeal, etc.), mainly used for the isolation of Actinomycetota. At the same time, the media rarely contained high concentrations of salts (sodium or calcium), and the pH was not adjusted to the alkalinity ranges where terrestrial Euzebya and other related bacteria are abundant. None of these attempts were able to isolate strains of Euzebya, Nitriliruptor, Rubrobacter, Solirubrobacter, Gaiella, Halomonas, etc., which clearly indicates that the culture media used failed to reproduce the ecological conditions where these bacteria succeed.

7. Attempts to Isolate Euzebya from Pindal Cave

Pindal Cave is a shallow limestone cave formed through epigenic processes and located very close to the surface. The cave is 590 m long and due to the geographical location has a humid oceanic climate. The cave has a stable annual temperature (11.6 °C) with only minor fluctuations throughout the year (<2 °C/year). This cave is well-ventilated with relatively low annual average values of CO2 (680 ppm) and radon (950 Bq/m3) [36].
In Pindal Cave, pink biofilms primarily develop on the surface of calcite speleothems in areas near the entrance and Euzebyaceae reached a relative abundance of 7–16%; the biofilms have a rough surface and are formed by aggregates of cells, mostly rounded, with extensive filaments (Figure 1). Other abundant genera were Crossiella and wp1-P19. The ecological significance of the five top taxa in Pindal Cave was discussed elsewhere [36][111][112]. However, attempts to isolate Euzebya using different culture media failed. The following media were used: nutrient agar (NA), B-4 medium [113], GYM Streptomyces medium (DSMZ 65), Dimethylsulfone medium [114], TSA, diluted TSA/1000, and TSA supplemented with NaCl (3%) and MgSO4·7H2O (2%) (DSMZ 1350) [115]. In all these media, the pH was near 7, and not as markedly alkaline as Euzebya requires (pH 9–10), as denoted by their habitats; in other cases, the absence of relatively high NaCl concentrations likely prevented its isolation.
Applsci 13 09644 g001
Figure 1. (a) Pink biofilms growing on calcite speleothems in Pindal Cave, Spain (red arrow). (b–d) Scanning electron microscopy microphotographs of pink biofilms from Pindal Cave. (b) General view of pink biofilms (red arrow). (c,d) Bacterial filaments forming the biofilm.

Culture media reproducing the environmental conditions reported in terrestrial ecosystems, e.g., SN medium and marine agar (including 1/10 dilutions of these media), pH 9–10, and sodium chloride concentrations around 3% or more, could allow the isolation of terrestrial Euzebya and other haloalkaliphilic genera. Marine agar and SN medium [116] have been used for the isolation of marine Euzebya [14][15][16]. Alternatively, for maintaining a high pH, the medium Z8-NK, as described by Flores et al. [117], R2A, and/or other media with the addition of trace elements, amino acids, vitamins, and simple carbon sources to a minimal culture medium should be explored.

8. Concluding Remarks

NGS technologies have allowed the detection of unknown microorganisms and extended our knowledge of the diversity of microbial life on Earth. However, the majority of taxa are part of the yet-uncultured microbial dark matter that significantly contributes to ecosystem functioning [118][119].

The data indicate that Euzebya is present across the entire biosphere. The question is whether their species were dispersed from marine sources to the terrestrial environment or if they are truly terrestrial, not yet described, species.

Here, it is shown that Euzebya and other bacteria can thrive under harsh conditions, such as high concentrations of sodium and/or calcium, high electric conductivity, alkaline pH, and highly variable temperature and water fluctuations. These ecological conditions in the studied terrestrial environments are quasi-extreme.

Unfortunately, the culture media used so far for the isolation of Euzebya failed to reproduce the original conditions of these harsh terrestrial ecosystems and this could be the reason why strains of Euzebya and other bacteria that inhabit the same niche were not isolated.

Some of the pitfalls and limitations of commonly used culture media and possible solutions to challenges faced in isolating terrestrial Euzebya strains are presented. The importance of combining high-throughput sequencing and cultivation techniques is of the utmost interest for this task. Data on the physicochemical and environmental parameters of the terrestrial ecosystems where Euzebya thrives should be taken into account when designing appropriate culture media.

It is expected that the interest in the biogeochemical role and geographical distribution of Euzebya will promote the optimization of culture media, and in this way, researchers will be able to isolate novel Euzebya species from different terrestrial environments.

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Subjects: Marine & Freshwater Biology; Microbiology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Jose Luis Gonzalez-Pimentel
,
Tamara Martin-Pozas
,
Valme Jurado
,
Leonila Laiz
,
Angel Fernandez-Cortes
,
Sergio Sanchez-Moral
,
Cesareo Saiz-Jimenez
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Update Date: 01 Nov 2023
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