Light and Primary Production Shape Bacterial Activity and Community Composition of Aerobic Anoxygenic Phototrophic Bacteria in a Microcosm Experiment

0532783 - MBÚ 2021 RIV US eng J - Článek v odborném periodiku
Piwosz, Kasia - Vrdoljak, A. - Frenken, T. - Gonzalez-Olalla, J. M. - Šantić, D. - McKay, R. M. - Spilling, K. - Guttman, L. - Znachor, Petr - Mujakić, Izabela - Kolesár Fecskeová, Lívia - Zoccarato, L. - Hanusová, Martina - Pessina, A. - Reich, T. - Grossart, H.P. - Koblížek, Michal
Light and Primary Production Shape Bacterial Activity and Community Composition of Aerobic Anoxygenic Phototrophic Bacteria in a Microcosm Experiment.
mSphere. Roč. 5, č. 4 (2020), č. článku e00354-20. ISSN 2379-5042. E-ISSN 2379-5042
Grant CEP: GA ČR(CZ) GJ18-14095Y
Institucionální podpora: RVO:61388971 ; RVO:60077344
Klíčová slova: dissolved organic-matter * heterotrophic bacteria * leucine incorporation * protein-synthesis * phytoplankton * carbon * aerobic anoxygenic phototrophic bacteria
Obor OECD: Microbiology; Microbiology (BC-A)
Impakt faktor: 4.389, rok: 2020
Způsob publikování: Open access
https://msphere.asm.org/content/msph/5/4/e00354-20.full.pdf

Phytoplankton is a key component of aquatic microbial communities, and metabolic coupling between phytoplankton and bacteria determines the fate of dissolved organic carbon (DOC). Yet, the impact of primary production on bacterial activity and community composition remains largely unknown, as, for example, in the case of aerobic anoxygenic phototrophic (AAP) bacteria that utilize both phytoplankton-derived DOC and light as energy sources. Here, we studied how reduction of primary production in a natural freshwater community affects the bacterial community composition and its activity, focusing primarily on AAP bacteria. The bacterial respiration rate was the lowest when photosynthesis was reduced by direct inhibition of photosystem II and the highest in ambient light condition with no photosynthesis inhibition, suggesting that it was limited by carbon availability. However, bacterial assimilation rates of leucine and glucose were unaffected, indicating that increased bacterial growth efficiency (e.g., due to photoheterotrophy) can help to maintain overall bacterial production when low primary production limits DOC availability. Bacterial community composition was tightly linked to light intensity, mainly due to the increased relative abundance of light-dependent AAP bacteria. This notion shows that changes in bacterial community composition are not necessarily reflected by changes in bacterial production or growth and vice versa. Moreover, we demonstrated for the first time that light can directly affect bacterial community composition, a topic which has been neglected in studies of phytoplankton-bacteria interactions.
Trvalý link: http://hdl.handle.net/11104/0311229