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Plant function and evolutionary biology
RESEARCH ARTICLE (Open Access)

A new method for separate evaluation of PSII with inactive oxygen evolving complex and active D1 by the pulse-amplitude modulated chlorophyll fluorometry

Masaru Kono https://orcid.org/0000-0002-1543-937X A B , Sae Matsuzawa A , Takaya Noguchi A , Kazunori Miyata A , Riichi Oguchi A and Ichiro Terashima https://orcid.org/0000-0001-7680-9867 A
+ Author Affiliations
- Author Affiliations

A Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

B Corresponding author. Email: konom07@bs.s.u-tokyo.ac.jp

Functional Plant Biology - https://doi.org/10.1071/FP21073
Submitted: 6 March 2021  Accepted: 13 August 2021   Published online: 13 September 2021

Journal compilation © CSIRO 2021 Open Access CC BY-NC-ND

Abstract

A method that separately quantifies the PSII with inactive oxygen-evolving complex (OEC) and active D1 retaining the primary quinone acceptor (QA)-reducing activity from the PSII with damaged D1 in the leaf was developed using PAM fluorometry. It is necessary to fully reduce QA to obtain Fm, the maximum fluorescence. However, QA in PSII with inactive OEC and active D1 would not be fully reduced by a saturating flash. We used the acceptor-side inhibitor DCMU to fully reduce QA. Leaves of cucumber (Cucumis sativus L.) were chilled at 4°C in dark or illuminated with UV-A to selectively inactivate OEC. After these treatments, Fv/Fm, the maximum quantum yield, in the leaves vacuum-infiltrated with DCMU were greater than those in water-infiltrated leaves. In contrast, when the leaves were illuminated by red light to photodamage D1, Fv/Fm did not differ between DCMU- and water-infiltrated leaves. These results indicate relevance of the present evaluation of the fraction of PSII with inactive OEC and active D1. Several examinations in the laboratory and glasshouse showed that PSII with inactive OEC and active D1 was only rarely observed. The present simple method would serve as a useful tool to clarify the details of the PSII photoinhibition.

Keywords: Cucumis sativus, oxygen-evolving complex, pulse-amplitude modulated fluorometry, PAM, DCMU, Fv/Fm, PSII, photoinhibition.


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