Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching
Non-photochemical quenching (NPQ) is an important photoprotective mechanism in plants and algae. Although the process is extensively studied, little is known about its relationship with ultrastructural changes of the thylakoid membranes. In order to better understand this relationship, we studied th...
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The Royal Society
2020-09-01
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Series: | Open Biology |
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Online Access: | https://royalsocietypublishing.org/doi/pdf/10.1098/rsob.200144 |
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author | Renáta Ünnep Suman Paul Ottó Zsiros László Kovács Noémi K. Székely Gábor Steinbach Marie-Sousai Appavou Lionel Porcar Alfred R. Holzwarth Győző Garab Gergely Nagy |
author_facet | Renáta Ünnep Suman Paul Ottó Zsiros László Kovács Noémi K. Székely Gábor Steinbach Marie-Sousai Appavou Lionel Porcar Alfred R. Holzwarth Győző Garab Gergely Nagy |
author_sort | Renáta Ünnep |
collection | DOAJ |
description | Non-photochemical quenching (NPQ) is an important photoprotective mechanism in plants and algae. Although the process is extensively studied, little is known about its relationship with ultrastructural changes of the thylakoid membranes. In order to better understand this relationship, we studied the effects of illumination on the organization of thylakoid membranes in Monstera deliciosa leaves. This evergreen species is known to exhibit very large NPQ and to possess giant grana with dozens of stacked thylakoids. It is thus ideally suited for small-angle neutron scattering measurements (SANS)—a non-invasive technique, which is capable of providing spatially and statistically averaged information on the periodicity of the thylakoid membranes and their rapid reorganizations in vivo. We show that NPQ-inducing illumination causes a strong decrease in the periodic order of granum thylakoid membranes. Development of NPQ and light-induced ultrastructural changes, as well as the relaxation processes, follow similar kinetic patterns. Surprisingly, whereas NPQ is suppressed by diuron, it impedes only the relaxation of the structural changes and not its formation, suggesting that structural changes do not cause but enable NPQ. We also demonstrate that the diminishment of SANS peak does not originate from light-induced redistribution and reorientation of chloroplasts inside the cells. |
first_indexed | 2024-12-23T20:08:45Z |
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id | doaj.art-bd9b3516d0b54e9fb2ee41a99db2b199 |
institution | Directory Open Access Journal |
issn | 2046-2441 |
language | English |
last_indexed | 2024-12-23T20:08:45Z |
publishDate | 2020-09-01 |
publisher | The Royal Society |
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series | Open Biology |
spelling | doaj.art-bd9b3516d0b54e9fb2ee41a99db2b1992022-12-21T17:32:53ZengThe Royal SocietyOpen Biology2046-24412020-09-0110910.1098/rsob.200144200144Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenchingRenáta ÜnnepSuman PaulOttó ZsirosLászló KovácsNoémi K. SzékelyGábor SteinbachMarie-Sousai AppavouLionel PorcarAlfred R. HolzwarthGyőző GarabGergely NagyNon-photochemical quenching (NPQ) is an important photoprotective mechanism in plants and algae. Although the process is extensively studied, little is known about its relationship with ultrastructural changes of the thylakoid membranes. In order to better understand this relationship, we studied the effects of illumination on the organization of thylakoid membranes in Monstera deliciosa leaves. This evergreen species is known to exhibit very large NPQ and to possess giant grana with dozens of stacked thylakoids. It is thus ideally suited for small-angle neutron scattering measurements (SANS)—a non-invasive technique, which is capable of providing spatially and statistically averaged information on the periodicity of the thylakoid membranes and their rapid reorganizations in vivo. We show that NPQ-inducing illumination causes a strong decrease in the periodic order of granum thylakoid membranes. Development of NPQ and light-induced ultrastructural changes, as well as the relaxation processes, follow similar kinetic patterns. Surprisingly, whereas NPQ is suppressed by diuron, it impedes only the relaxation of the structural changes and not its formation, suggesting that structural changes do not cause but enable NPQ. We also demonstrate that the diminishment of SANS peak does not originate from light-induced redistribution and reorientation of chloroplasts inside the cells.https://royalsocietypublishing.org/doi/pdf/10.1098/rsob.200144chloroplast thylakoid membranesgranalamellar repeat distancenon-photochemical quenchingsmall-angle neutron scattering |
spellingShingle | Renáta Ünnep Suman Paul Ottó Zsiros László Kovács Noémi K. Székely Gábor Steinbach Marie-Sousai Appavou Lionel Porcar Alfred R. Holzwarth Győző Garab Gergely Nagy Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching Open Biology chloroplast thylakoid membranes grana lamellar repeat distance non-photochemical quenching small-angle neutron scattering |
title | Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching |
title_full | Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching |
title_fullStr | Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching |
title_full_unstemmed | Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching |
title_short | Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching |
title_sort | thylakoid membrane reorganizations revealed by small angle neutron scattering of monstera deliciosa leaves associated with non photochemical quenching |
topic | chloroplast thylakoid membranes grana lamellar repeat distance non-photochemical quenching small-angle neutron scattering |
url | https://royalsocietypublishing.org/doi/pdf/10.1098/rsob.200144 |
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