Abstract
The main benefit involved in the mutualistic relationship between Paramecium bursaria and Chlorella has been traditionally interpreted as an adaptation to the struggle against starvation and nutrient limitation. However, other benefits such as the minimization of mortality and protection against damage by sunlight have been proposed recently. Here, we explore the photobiological adaptations and responses of P. bursaria and its algal symbionts when exposed to photosynthetically active and ultraviolet radiation, as well as the role of (photo-)oxidative and antioxidative defenses in the symbiosis. We conclude that the benefits are multiple and should be considered as a whole when assessing the selective advantage of living in mutualistic symbiosis.
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Acknowledgements
We thank M.T. Pérez and M. Summerer for critical reading of the original manuscript. We are also indebted to M. Summerer for providing Figs. 1–3, P. Hörtnagl for providing Fig. 5, and T. Kawano for providing Fig. 4 in color. This work was supported by the Austrian Science Fund (project FWF 16559) granted to R.S.
End Note The original light intensity in the paper by Kawano et al. (2004) was given in lux, which can only be converted to micromole photons per square meter per second when the wavelength dependency is considered. Here a factor of 0.0165 was applied to facilitate comparison with other studies.
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Sommaruga, R., Sonntag, B. (2009). Photobiological Aspects of the Mutualistic Association Between Paramecium bursaria and Chlorella . In: Fujishima, M. (eds) Endosymbionts in Paramecium. Microbiology Monographs, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-92677-1_5
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