The role of endosymbiotic algae in photoaccumulation of green Paramecium bursaria

Planta ◽  
1981 ◽  
Vol 152 (3) ◽  
pp. 268-271 ◽  
Author(s):  
D�rte Niess ◽  
Werner Reisser ◽  
Wolfgang Wiessner
Keyword(s):  
Paramecium Bursaria ◽  
Endosymbiotic Algae

Cloning and characterization of endosymbiotic algae isolated from Paramecium bursaria

PROTOPLASMA ◽  
1998 ◽  
Vol 203 (1-2) ◽  
pp. 91-99 ◽  
Author(s):  
N. Nishihara ◽  
S. Horiike ◽  
T. Takahashi ◽  
T. Kosaka ◽  
Y. Shigenaka ◽  
...  
Keyword(s):  
Paramecium Bursaria ◽  
Endosymbiotic Algae

Photosynthetic efficiency of endosymbiotic algae of Paramecium bursaria originating from locations with cold and warm climates

2018 ◽  
Vol 47 (2) ◽  
pp. 202-210
Author(s):  
Katarzyna Możdżeń ◽  
Patrycja Z. Leśnicka ◽  
Tomasz Burnecki ◽  
Sylwia Śliwińska-Wilczewska ◽  
Andrzej Skoczowski ◽  
...  
Keyword(s):  
Photosynthetic Activity ◽  
Cold Climate ◽  
Paramecium Bursaria ◽  
Control Group ◽  
Constant Darkness ◽  
Light Conditions ◽  
Warm Climate ◽  
Symbiotic Algae ◽  
Different Temperatures ◽  
Endosymbiotic Algae

Abstract Paramecium bursaria (Ciliophora) is a cosmopolitan unicellular organism that plays a significant role in aquatic ecosystems. P. bursaria contains symbiotic algae and this association is a mutual symbiosis. The aim of the present study was to determine the activity of photosystem II (PSII) in Chlorella sp. inside P. bursaria cells. Ciliates were incubated for 7 days at different temperatures from 6 to 18°C, under the circadian cycle: 12 h light/12 h dark, at light intensity of 200 μmol m-2 s-1 and under constant darkness conditions. The control group was kept at a temperature of 18°C under constant light conditions. Changes in PSII were monitored using different fluorescence parameters. Differences in responses between endosymbiotic algae of two P. bursaria strains – Ard7 from a warm climate and KD64 from a cold climate – were determined. The highest photosynthetic activity of P. bursaria green endosymbionts was observed at a temperature of 18°C, regardless of the light conditions. Algae from warm climate were more sensitive to cold temperature stress than algae from P. bursaria collected in cold climate.

scholarly journals The Role of Radiation in Photodynamic Action

1951 ◽  
Vol 28 (4) ◽  
pp. 537-540
Author(s):  
G. CALCUTT
Keyword(s):  
Normal Condition ◽  
Paramecium Bursaria ◽  
Photodynamic Action

It has been demonstrated that, within certain limits, the radiation of cultures of Paramecium bursaria, which had been kept in the dark, with wave-lengths greater than 3300 A., facilitates a subsequently elicited photodynamic response. A period of darkness following the pre-irradiation allows of a return to the normal condition. The role of radiation in the mechanism of photodynamic action is discussed.

scholarly journals The photosynthetic activity of Paramecium bursaria endosymbiotic algae in varying temperature conditions

2017 ◽  
Author(s):  
Katarzyna Możdżeń ◽  
Patrycja Zagata-Leśnicka ◽  
Mateusz Ślęczka ◽  
Magdalena Greczek-Stachura
Keyword(s):  
Fluorescence Spectra ◽  
Photosynthetic Activity ◽  
Red Light ◽  
Paramecium Bursaria ◽  
Green Fluorescence ◽  
Chlorella Sp ◽  
Fluorescence Measurements ◽  
Higher Temperature ◽  
Endosymbiotic Algae ◽  
C 30

The aim of this study was to investigate the effect of higher temperatures on the photosynthesis of endosymbiotic Chlorella sp. of two Paramecium bursaria Ehrenberg 1831 strains originating from regions with a warmer and colder climate (Ardmore – USA and Kamchatka – Russia, respectively). After seven days of protozoa incubation at 18°C (control), 21°C, 24°C, 27°C, 30°C and 33°C, the chlorophyll a fluorescence measurements were carried out and fluorescence spectra were measured in blue-green and red light. As a result of the studies, a significant effect of higher temperature on the photosynthesis process of P. bursaria endosymbionts was observed. Weekly incubation at 33°C was lethal for both protozoan strains in comparison to the control temperature (18°C). The blue-green fluorescence spectra were characterised by marked peaks at 450 nm and 490 nm. Within the red light range, the peak was observed at about 690 nm with a lesser arm at 730 nm. Endosymbionts from Kamchatka were more sensitive to the temperature increase than algae from areas with relatively warm climates.

scholarly journals Catalysis of Chlorovirus Production by the Foraging of Bursaria truncatella on Paramecia bursaria Containing Endosymbiotic Algae

2021 ◽  
Vol 9 (10) ◽  
pp. 2170
Author(s):  
Zeina T. Al-Ameeli ◽  
Maitham M. Al-Sammak ◽  
John P. DeLong ◽  
David D. Dunigan ◽  
James L. Van Van Etten
Keyword(s):  
Green Algae ◽  
Virus Replication ◽  
Paramecium Bursaria ◽  
Fecal Pellets ◽  
Population Sizes ◽  
Endosymbiotic Algae ◽  
Additional Support

Chloroviruses are large viruses that replicate in chlorella-like green algae and normally exist as mutualistic endosymbionts (referred to as zoochlorellae) in protists such as Paramecium bursaria. Chlorovirus populations rise and fall in indigenous waters through time; however, the factors involved in these virus fluctuations are still under investigation. Chloroviruses attach to the surface of P. bursaria but cannot infect their zoochlorellae hosts because the viruses cannot reach the zoochlorellae as long as they are in the symbiotic phase. Predators of P. bursaria, such as copepods and didinia, can bring chloroviruses into contact with zoochlorellae by disrupting the paramecia, which results in an increase in virus titers in microcosm experiments. Here, we report that another predator of P. bursaria, Bursaria truncatella, can also increase chlorovirus titers. After two days of foraging on P. bursaria, B. truncatella increased infectious chlorovirus abundance about 20 times above the controls. Shorter term foraging (3 h) resulted in a small increase of chlorovirus titers over the controls and more foraging generated more chloroviruses. Considering that B. truncatella does not release viable zoochlorellae either during foraging or through fecal pellets, where zoochlorellae could be infected by chlorovirus, we suggest a third pathway of predator virus catalysis. By engulfing the entire protist and digesting it slowly, virus replication can occur within the predator and some of the virus is passed out through a waste vacuole. These results provide additional support for the hypothesis that predators of P. bursaria are important drivers of chlorovirus population sizes and dynamics.

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