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Survey of the occurrence of desiccation-induced quenching of basal fluorescence in 28 species of green microalgae

Wieners, Paul ; Mudimu, Opayi ; Bilger, Wolfgang

Planta, 2018, Vol.248(3), pp.601-612 [Periódico revisado por pares]

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  • Título:
    Survey of the occurrence of desiccation-induced quenching of basal fluorescence in 28 species of green microalgae
  • Autor: Wieners, Paul ; Mudimu, Opayi ; Bilger, Wolfgang
  • Assuntos: Aero-terrestrial algae ; Desiccation tolerance ; Lichens ; Photobionts ; Photoprotection
  • É parte de: Planta, 2018, Vol.248(3), pp.601-612
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1007/s00425-018-2925-7 Byline: Paul Christian Wieners (1), Opayi Mudimu (1), Wolfgang Bilger (1) Keywords: Aero-terrestrial algae; Desiccation tolerance; Lichens; Photobionts; Photoprotection Abstract: Main conclusion Desiccation-induced chlorophyll fluorescence quenching seems to be an indispensable part of desiccation resistance in the surveyed 28 green microalgal species. Lichens are desiccation tolerant meta-organisms. In the desiccated state photosynthesis is inhibited rendering the photobionts potentially sensitive to photoinhibition. As a photoprotective mechanism, strong non-radiative dissipation of absorbed light leading to quenching of chlorophyll fluorescence has been proposed. Desiccation-induced quenching affects not only variable fluorescence, but also the so-called basal fluorescence, F .sub.0. This phenomenon is well-known for intact lichens and some free living aero-terrestrial algae, but it was often absent in isolated lichen algae. Therefore, a thorough screening for the appearance of desiccation-induced quenching was undertaken with 13 different aero-terrestrial microalgal species and lichen photobionts. They were compared with 15 aquatic green microalgal species, among them also three marine species. We asked the following questions: Do isolated lichen algae show desiccation-induced quenching? Are aero-terrestrial algae different in this respect to aquatic algae and is the potential for desiccation-induced quenching coupled to desiccation tolerance? How variable is desiccation-induced quenching among species? Most of the aero-terrestrial algae, including all lichen photobionts, showed desiccation-induced quenching, although highly variable in extent, whereas most of the aquatic algae did not. All algae displaying quenching were also desiccation tolerant, whereas all algae unable to perform desiccation-induced quenching were desiccation intolerant. Desiccation-induced fluorescence quenching seems to be an indispensable part of desiccation resistance in the investigated species. Author Affiliation: (1) 0000 0001 2153 9986, grid.9764.c, Botanical Institute, Christian-Albrechts University of Kiel, Olshausenstra[sz]e 40, DE, 24098, Kiel, Germany Article History: Registration Date: 24/05/2018 Received Date: 19/12/2017 Accepted Date: 22/05/2018 Online Date: 30/05/2018 Article note: Dedicated gratefully to the late Profs. Otto Ludwig Lange and Ulrich Heber, two pioneers in the ecophysiology of desiccation tolerance.
  • Idioma: Inglês

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