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

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

Open Access
|Jun 2018

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.

DOI: https://doi.org/10.1515/ohs-2018-0019 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X
Language: English
Page range: 202 - 210
Submitted on: Sep 7, 2017
Accepted on: Nov 21, 2017
Published on: Jun 18, 2018
Published by: University of Gdańsk
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2018 Katarzyna Możdżeń, Patrycja Z. Leśnicka, Tomasz Burnecki, Sylwia Śliwińska-Wilczewska, Andrzej Skoczowski, Magdalena Greczek-Stachura, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.