Physiological ecology of photosynthesis in <i><scp>P</scp>rasiola stipitata</i> (<scp>T</scp>rebouxiophyceae) from the <scp>B</scp>ay of <scp>F</scp>undy, <scp>C</scp>anada

Kang, Eun Ju; Scrosati, Ricardo A.; Garbary, David J.

doi:10.1111/pre.12017

Cited by 7 publications

(8 citation statements)

References 44 publications

(75 reference statements)

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“…In contrast to both Stichococcus-species, the average maximum quantum yield (Fig. 4A) in the Prasiola aerophytica control was at least 30% lower than previously reported literature values (Juneau and Harrison 2005, Gray et al 2007, Kang et al 2013, Gu era et al 2016, Zhang et al 2017, indicating that the applied cultivation methods were not suitable for this species. Hence, the physiological performance in P. aerophytica was already negatively affected under control conditions.…”

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confidence: 67%

Polyols and UV‐sunscreens in the Prasiola‐clade (Trebouxiophyceae, Chlorophyta) as metabolites for stress response and chemotaxonomy

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Glaser

Hartmann

et al. 2018

Journal of Phycology

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In many regions of the world, aeroterrestrial green algae of the Trebouxiophyceae (Chlorophyta) represent very abundant soil microorganisms, and hence their taxonomy is crucial to investigate their physiological performance and ecological importance. Due to a lack in morphological features, taxonomic and phylogenetic studies of Trebouxiophycean algae can be a challenging task. Since chemotaxonomic markers could be a great assistance in this regard, 22 strains of aeroterrestrial Trebouxiophyceae were chemically screened for their polyol‐patterns as well as for mycosporine‐like amino acids (MAAs) in their aqueous extracts using RP‐HPLC and LC‐MS. d‐sorbitol was exclusively detected in members of the Prasiolaceae family. The novel MAA prasiolin and a related compound (“prasiolin‐like”) were present in all investigated members of the Prasiola‐clade, but missing in all other tested Trebouxiophyceae. While prasiolin could only be detected in field material directly after extraction, the “prasiolin‐like” compound present in the other algae was fully converted into prasiolin after 24 h. These findings suggest d‐sorbitol and prasiolin‐like compounds are suitable chemotaxonomic markers for the Prasiolaceae and Prasiola‐clade, respectively. Additional UV‐exposure experiments with selected strains show that MAA formation and accumulation can be induced, supporting their role as UV‐sunscreen.

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confidence: 67%

Polyols and UV‐sunscreens in the Prasiola‐clade (Trebouxiophyceae, Chlorophyta) as metabolites for stress response and chemotaxonomy

Hotter

Glaser

Hartmann

et al. 2018

Journal of Phycology

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“…4A, C). The carbon assimilation of M. tessellata and different species of Prasiola have been previously reported (Smith & Gremmen, 2001a,b;Kang et al, 2013;Holzinger et al, 2017). Nevertheless, and as far as we are concerned, photosynthesis data of both M. tessellata and P. crispa have only been compared by Huiskes et al (1997b) so far, at nonsaturating irradiation and low temperature.…”

Section: Effect Of Lichenization In the Photosynthetic Performance Ofmentioning

confidence: 91%

Symbiosis at its limits: ecophysiological consequences of lichenization in the genus Prasiola in Antarctica

et al. 2019

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Background and Aims Lichens represent a symbiotic relationship between at least one fungal and one photosynthetic partner. The association between the lichen-forming fungus Mastodia tessellata (Verrucariaceae) and different species of Prasiola (Trebouxiophyceae) has an amphipolar distribution and represents a unique case study for the understanding of lichen symbiosis because of the macroalgal nature of the photobiont, the flexibility of the symbiotic interaction and the co-existence of free-living and lichenized forms in the same microenvironment. In this context, we aimed to (1) characterize the photosynthetic performance of co-occurring populations of free-living and lichenized Prasiola and (2) assess the effect of the symbiosis on water relations in Prasiola, including its tolerance of desiccation and its survival and performance under sub-zero temperatures. Methods Photochemical responses to irradiance, desiccation and freezing temperature and pressure–volume curves of co-existing free-living and lichenized Prasiola thalli were measured in situ in Livingston Island (Maritime Antarctica). Analyses of photosynthetic pigment, glass transition and ice nucleation temperatures, surface hydrophobicity extent and molecular analyses were conducted in the laboratory. Key Results Free-living and lichenized forms of Prasiola were identified as two different species: P. crispa and Prasiola sp., respectively. While lichenization appears to have no effect on the photochemical performance of the alga or its tolerance of desiccation (in the short term), the symbiotic lifestyle involves (1) changes in water relations, (2) a considerable decrease in the net carbon balance and (3) enhanced freezing tolerance. Conclusions Our results support improved tolerance of sub-zero temperature as the main benefit of lichenization for the photobiont, but highlight that lichenization represents a delicate equilibrium between a mutualistic and a less reciprocal relationship. In a warmer climate scenario, the spread of the free-living Prasiola to the detriment of the lichen form would be likely, with unknown consequences for Maritime Antarctic ecosystems.

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“…Kang et al . () made similar observations in the supralittoral Prasiola stipitata Suhr ex Jessen, indicating minimization of damage to the PSII complex from excess photon energy. Similarly, M. angicava might need to invest more energy to protect their PSII because of their parietal chloroplast position, which is more directly exposed to light than the varied chloroplast location in P. undulatum .…”

Section: Discussionmentioning

confidence: 57%

Chloroplast position and photosynthetic characteristics in two monostromatic species, Monostroma angicava and Protomonostroma undulatum (Ulvophyceae), having a shared ecological niche

Saco

Murakami

Sekida

et al. 2017

Phycological Research

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SUMMARYMonostroma angicava and Protomonostroma undulatum are monostromatic green benthic algae (Ulvophyceae), which grow together in the same intertidal habitat of Muroran, Hokkaido, Japan, during the spring season. Commonly, both species have a single chloroplast with one pyrenoid per cell. The parietal chloroplast is located on the periphery of the thallus in both species, although the location of the chloroplast differs in the two. In M. angicava, the chloroplast was observed to be arranged on one-side of the thallus surface, whereas, in P. undulatum, it was dispersed and randomly located on either side of the thallus or on the lateral face. The density of chlorophylls (Chls) assessed from the absorption spectra of the thallus and its solvent extract was higher in M. angicava, which appeared dark-green in color, than in the light-green colored P. undulatum. The maximum photosynthetic rate per thallus area (μmol O 2 m −2 s −1 ) was higher in M. angicava, whereas, per total chlorophyll content (μmol O 2 g Chl a + Chl b −1 s −1 ) was higher in P. undulatum. Both species showed similar efficiency of photosynthesis at light-limiting conditions. The efficiency of light absorption by photosystem II (PSII) in P. undulatum was higher than M. angicava, whereas the photoprotective response was higher in M. angicava. This indicates that more energy is utilized in M. angicava to protect its PSII due to the chloroplast position, which has more direct exposure to light and, therefore, lowers the efficiency of light absorption by PSII. The higher density of chlorophylls in M. angicava could explain higher photosynthesis per thallus area, whereas, higher efficiency of light absorption by PSII in P. undulatum could explain higher photosynthesis per total chlorophyll content. The differences in light absorption efficiency and quantum efficiency of PSII might be an important ecological strategy in these two species for their coexistence in the intertidal area.

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Physiological ecology of photosynthesis in Prasiola stipitata (Trebouxiophyceae) from the Bay of Fundy, Canada

Cited by 7 publications

References 44 publications

Polyols and UV‐sunscreens in the Prasiola‐clade (Trebouxiophyceae, Chlorophyta) as metabolites for stress response and chemotaxonomy

Polyols and UV‐sunscreens in the Prasiola‐clade (Trebouxiophyceae, Chlorophyta) as metabolites for stress response and chemotaxonomy

Symbiosis at its limits: ecophysiological consequences of lichenization in the genus Prasiola in Antarctica

Chloroplast position and photosynthetic characteristics in two monostromatic species, Monostroma angicava and Protomonostroma undulatum (Ulvophyceae), having a shared ecological niche

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