A chemosystematic investigation of selected &lt;italic&gt;Stichococcus&lt;/italic&gt;-like organisms (Trebouxiophyta)

Van, Anh Tu; Karsten, Ulf; Glaser, Karin

doi:10.4490/algae.2021.36.6.5

Cited by 6 publications

(13 citation statements)

References 45 publications

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“…Proline, together with sorbitol, is among the key compatible solutes associated with protection from damage induced by various stress factors interfering with osmoregulation, such as dehydration [ 56 , 57 ]. The higher sorbitol and proline contents in D. epiphytica were confirmed using an HPLC assay and a spectrophotometric assay, respectively ( Table S2 ), in agreement with previous work on the same strain (SAG 11.88) and D. chodatii , showing that sorbitol is present at high concentrations [ 16 , 17 , 18 ]. Several sugars and sugar alcohols, including sorbitol, have been suggested to play a role in desiccation tolerance [ 30 , 32 ], but they also play a role in the lichen symbiosis [ 31 , 32 , 58 ].…”

Section: Discussionsupporting

confidence: 90%

“…Trebouxiophyceae are widespread globally, and occur in many aquatic and terrestrial ecosystems [ 9 , 10 , 11 ] with different lifestyles [ 2 , 12 ] either free-living or as lichen photobionts [ 13 , 14 , 15 ]. Ecophysiological traits of D. epiphtica and D. chodatii were recently reported [ 16 , 17 , 18 ]. In D. epiphtica , sorbitol and sucrose contents were used as chemotaxonomic markers [ 16 ], and the potential of Diplopshaera spp.…”

Section: Introductionmentioning

confidence: 99%

“…Ecophysiological traits of D. epiphtica and D. chodatii were recently reported [ 16 , 17 , 18 ]. In D. epiphtica , sorbitol and sucrose contents were used as chemotaxonomic markers [ 16 ], and the potential of Diplopshaera spp. for biotechnological applications was investigated [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Metabolite Profiling in Green Microalgae with Varying Degrees of Desiccation Tolerance

et al. 2022

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Trebouxiophyceae are microalgae occupying even extreme environments such as polar regions or deserts, terrestrial or aquatic, and can occur free-living or as lichen photobionts. Yet, it is poorly understood how environmental factors shape their metabolism. Here, we report on responses to light and temperature, and metabolic adjustments to desiccation in Diplosphaera epiphytica, isolated from a lichen, and Edaphochlorella mirabilis, isolated from Tundra soil, assessed via growth and photosynthetic performance parameters. Metabolite profiling was conducted by GC–MS. A meta-analysis together with data from a terrestrial and an aquatic Chlorella vulgaris strain reflected elements of phylogenetic relationship, lifestyle, and relative desiccation tolerance of the four algal strains. For example, compatible solutes associated with desiccation tolerance were up-accumulated in D. epiphytica, but also sugars and sugar alcohols typically produced by lichen photobionts. The aquatic C. vulgaris, the most desiccation-sensitive strain, showed the greatest variation in metabolite accumulation after desiccation and rehydration, whereas the most desiccation-tolerant strain, D. epiphytica, showed the least, suggesting that it has a more efficient constitutive protection from desiccation and/or that desiccation disturbed the metabolic steady-state less than in the other three strains. The authors hope that this study will stimulate more research into desiccation tolerance mechanisms in these under-investigated microorganisms.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Metabolite Profiling in Green Microalgae with Varying Degrees of Desiccation Tolerance

et al. 2022

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“…It is possible that the genus Pseudostichococcus as a whole is more halotolerant than others within the Stichococcus-like clade. The hitherto monotypic genus Pseudostichococcus has been revised to also include the strains Pseudostichococcus sequoieti LB 1820 and Pseudostichococcus undulatus CALU-1142 used in this study, and that the latter strains belong to a second, possibly not halotolerant clade, within Pseudostichococcus [40]. Further studies are needed to delineate the ecological traits of Pseudostichococcus from those of the other Stichococcus-like strains.…”

Section: Growth In Response To Saline Stressmentioning

confidence: 99%

The Ecophysiological Performance and Traits of Genera within the Stichococcus-like Clade (Trebouxiophyceae) under Matric and Osmotic Stress

2021

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Changes in water balance are some of the most critical challenges that aeroterrestrial algae face. They have a wide variety of mechanisms to protect against osmotic stress, including, but not limited to, downregulating photosynthesis, the production of compatible solutes, spore and akinete formation, biofilms, as well as triggering structural cellular changes. In comparison, algae living in saline environments must cope with ionic stress, which has similar effects on the physiology as desiccation in addition to sodium and chloride ion toxicity. These environmental challenges define ecological niches for both specialist and generalist algae. One alga known to be aeroterrestrial and euryhaline is Stichococcus bacillaris Nägeli, possessing the ability to withstand both matric and osmotic stresses, which may contribute to wide distribution worldwide. Following taxonomic revision of Stichococcus into seven lineages, we here examined their physiological responses to osmotic and matric stress through a salt growth challenge and desiccation experiment. The results demonstrate that innate compatible solute production capacity under salt stress and desiccation tolerance are independent of one another, and that salt tolerance is more variable than desiccation tolerance in the Stichococcus-like genera. Furthermore, algae within this group likely occupy similar ecological niches, with the exception of Pseudostichococcus.

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“…As with the other Stichococcus-like organisms, Pseudostichococcus are present in a variety of habitats, such as such as tree bark, surfaces of buildings and outdoor structures, diverse soils and are also components of biocrusts. A previous study indicated that Pseudostichococcus may be more halotolerant than previously assumed, as those strains retained vitality despite cultivation at very high salinities [39].…”

Section: Introductionmentioning

confidence: 86%

Pseudostichococcus Stands Out from Its Siblings Due to High Salinity and Desiccation Tolerance

Van

Glaser

2022

Phycology

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Desiccation and high salinity are two abiotic stressors that are related in terms of their effect on water homeostasis within cells. The success of certain aeroterrestrial microalgae is influenced by their ability to cope with desiccation, and in some cases, high salinity. The microalgae of the Stichococcus clade are ubiquitous in terrestrial habitats and are known to withstand desiccation and salinity stress by accumulating secondary metabolites. Nevertheless, it remains unclear if those two related stressors have a synergistic effect. Hence, we studied the effect of salinity on desiccation on various representative taxa within the Stichococcus clade. The results showed that in contrast to other Stichococcus taxa, Pseudostichococcus was able to recover fully after desiccation, with and without salinity stress. This observation was connected to elevated proline production under salinity stress and higher proline:sorbitol ratio in Pseudostichococcus to the other strains tested. In the other taxa, increasing salinity reduced their ability to withstand desiccation. This might have severe effects on microalgae in (semi)arid regions, where salinization of soils is an increasing threat also for agriculture. The results encourage further research to be done on the possible applications of this genus in salinity bioremediation, as it seems to be comparable to other halotolerant green algae used for this purpose.

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A chemosystematic investigation of selected <italic>Stichococcus</italic>-like organisms (Trebouxiophyta)

Cited by 6 publications

References 45 publications

Metabolite Profiling in Green Microalgae with Varying Degrees of Desiccation Tolerance

Metabolite Profiling in Green Microalgae with Varying Degrees of Desiccation Tolerance

The Ecophysiological Performance and Traits of Genera within the Stichococcus-like Clade (Trebouxiophyceae) under Matric and Osmotic Stress

Pseudostichococcus Stands Out from Its Siblings Due to High Salinity and Desiccation Tolerance

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