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Shade lichens are characterized by rapid relaxation of non-photochemical quenching on transition to darkness

Published online by Cambridge University Press:  13 October 2021

Richard P. Beckett Open the ORCID record for Richard P. Beckett [Opens in a new window] ,
Farida V. Minibayeva Open the ORCID record for Farida V. Minibayeva [Opens in a new window]  and
Kwanele W. G. Mkhize
Richard P. Beckett*
Affiliation:
School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa Open Lab ‘Biomarker’, Kazan (Volga Region) Federal University, Kremlevskaya Str. 18, Kazan 420008, Russia
Farida V. Minibayeva
Affiliation:
Kazan Institute of Biochemistry and Biophysics, Federal Research Center ‘Kazan Scientific Center of RAS’, PO Box 30, Kazan 420111, Russia
Kwanele W. G. Mkhize
Affiliation:
School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa
*
Author for correspondence: Richard P. Beckett. E-mail: [email protected]
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Abstract

Non-photochemical quenching (NPQ) plays an important role in protecting photosynthetic organisms from photoinhibition by dissipating excess light energy as heat. However, excess NPQ can greatly reduce the quantum yield of photosynthesis at lower light levels. Recently, there has been considerable interest in understanding how plants balance NPQ to ensure optimal productivity in environments in which light levels are rapidly changing. In the present study, chlorophyll fluorescence was used to study the induction and relaxation of non-photochemical quenching (NPQ) in the dark and the induction of photosynthesis in ten species of lichens, five sampled from exposed and five sampled from shaded habitats. Here we show that the main difference between sun and shade lichens is the rate at which NPQ relaxes in the dark, rather than the speed that photosynthesis starts upon illumination. During the first two minutes in the dark, NPQ values in the five sun species declined only by an average of 2%, while by contrast, in shade species the average decline was 40%. For lichens growing in microhabitats where light levels are rapidly changing, rapid relaxation of NPQ may enable their photobionts to use the available light most efficiently.

Keywords

chlorophyll fluorescencephotoprotectionphotosynthesissunfleckxanthophyll cycle
Type
Standard Paper
Information
The Lichenologist , Volume 53 , Issue 5 , September 2021 , pp. 409 - 414
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the British Lichen Society

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