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Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase

Salt stress triggers an Stt7-mediated LHCII-phosphorylation signaling mechanism similar to light-induced state transitions. However, phosphorylated LHCII, after detaching from PSII, does not attach to PSI but self-aggregates instead. Salt is a major stress factor in the growth of algae and plants. H...

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Autores principales: Devadasu, Elsinraju, Kanna, Sai Divya, Neelam, Satyabala, Yadav, Ranay Mohan, Nama, Srilatha, Akhtar, Parveen, Polgár, Tamás F., Ughy, Bettina, Garab, Győző, Lambrev, Petar H., Subramanyam, Rajagopal
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10113551/
https://www.ncbi.nlm.nih.gov/pubmed/37089643
http://dx.doi.org/10.3389/fpls.2023.1051711
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author Devadasu, Elsinraju
Kanna, Sai Divya
Neelam, Satyabala
Yadav, Ranay Mohan
Nama, Srilatha
Akhtar, Parveen
Polgár, Tamás F.
Ughy, Bettina
Garab, Győző
Lambrev, Petar H.
Subramanyam, Rajagopal
author_facet Devadasu, Elsinraju
Kanna, Sai Divya
Neelam, Satyabala
Yadav, Ranay Mohan
Nama, Srilatha
Akhtar, Parveen
Polgár, Tamás F.
Ughy, Bettina
Garab, Győző
Lambrev, Petar H.
Subramanyam, Rajagopal
author_sort Devadasu, Elsinraju
collection PubMed
description Salt stress triggers an Stt7-mediated LHCII-phosphorylation signaling mechanism similar to light-induced state transitions. However, phosphorylated LHCII, after detaching from PSII, does not attach to PSI but self-aggregates instead. Salt is a major stress factor in the growth of algae and plants. Here, our study mainly focuses on the organization of the photosynthetic apparatus to the long-term responses of Chlamydomonas reinhardtii to elevated NaCl concentrations. We analyzed the physiological effects of salt treatment at a cellular, membrane, and protein level by microscopy, protein profile analyses, transcripts, circular dichroism spectroscopy, chlorophyll fluorescence transients, and steady-state and time-resolved fluorescence spectroscopy. We have ascertained that cells that were grown in high-salinity medium form palmelloids sphere-shaped colonies, where daughter cells with curtailed flagella are enclosed within the mother cell walls. Palmelloid formation depends on the presence of a cell wall, as it was not observed in a cell-wall-less mutant CC-503. Using the stt7 mutant cells, we show Stt7 kinase-dependent phosphorylation of light-harvesting complex II (LHCII) in both short- and long-term treatments of various NaCl concentrations—demonstrating NaCl-induced state transitions that are similar to light-induced state transitions. The grana thylakoids were less appressed (with higher repeat distances), and cells grown in 150 mM NaCl showed disordered structures that formed diffuse boundaries with the flanking stroma lamellae. PSII core proteins were more prone to damage than PSI. At high salt concentrations (100–150 mM), LHCII aggregates accumulated in the thylakoid membranes. Low-temperature and time-resolved fluorescence spectroscopy indicated that the stt7 mutant was more sensitive to salt stress, suggesting that LHCII phosphorylation has a role in the acclimation and protection of the photosynthetic apparatus.
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spelling pubmed-101135512023-04-20 Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase Devadasu, Elsinraju Kanna, Sai Divya Neelam, Satyabala Yadav, Ranay Mohan Nama, Srilatha Akhtar, Parveen Polgár, Tamás F. Ughy, Bettina Garab, Győző Lambrev, Petar H. Subramanyam, Rajagopal Front Plant Sci Plant Science Salt stress triggers an Stt7-mediated LHCII-phosphorylation signaling mechanism similar to light-induced state transitions. However, phosphorylated LHCII, after detaching from PSII, does not attach to PSI but self-aggregates instead. Salt is a major stress factor in the growth of algae and plants. Here, our study mainly focuses on the organization of the photosynthetic apparatus to the long-term responses of Chlamydomonas reinhardtii to elevated NaCl concentrations. We analyzed the physiological effects of salt treatment at a cellular, membrane, and protein level by microscopy, protein profile analyses, transcripts, circular dichroism spectroscopy, chlorophyll fluorescence transients, and steady-state and time-resolved fluorescence spectroscopy. We have ascertained that cells that were grown in high-salinity medium form palmelloids sphere-shaped colonies, where daughter cells with curtailed flagella are enclosed within the mother cell walls. Palmelloid formation depends on the presence of a cell wall, as it was not observed in a cell-wall-less mutant CC-503. Using the stt7 mutant cells, we show Stt7 kinase-dependent phosphorylation of light-harvesting complex II (LHCII) in both short- and long-term treatments of various NaCl concentrations—demonstrating NaCl-induced state transitions that are similar to light-induced state transitions. The grana thylakoids were less appressed (with higher repeat distances), and cells grown in 150 mM NaCl showed disordered structures that formed diffuse boundaries with the flanking stroma lamellae. PSII core proteins were more prone to damage than PSI. At high salt concentrations (100–150 mM), LHCII aggregates accumulated in the thylakoid membranes. Low-temperature and time-resolved fluorescence spectroscopy indicated that the stt7 mutant was more sensitive to salt stress, suggesting that LHCII phosphorylation has a role in the acclimation and protection of the photosynthetic apparatus. Frontiers Media S.A. 2023-04-05 /pmc/articles/PMC10113551/ /pubmed/37089643 http://dx.doi.org/10.3389/fpls.2023.1051711 Text en Copyright © 2023 Devadasu, Kanna, Neelam, Yadav, Nama, Akhtar, Polgár, Ughy, Garab, Lambrev and Subramanyam https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Devadasu, Elsinraju
Kanna, Sai Divya
Neelam, Satyabala
Yadav, Ranay Mohan
Nama, Srilatha
Akhtar, Parveen
Polgár, Tamás F.
Ughy, Bettina
Garab, Győző
Lambrev, Petar H.
Subramanyam, Rajagopal
Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase
title Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase
title_full Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase
title_fullStr Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase
title_full_unstemmed Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase
title_short Long- and short-term acclimation of the photosynthetic apparatus to salinity in Chlamydomonas reinhardtii. The role of Stt7 protein kinase
title_sort long- and short-term acclimation of the photosynthetic apparatus to salinity in chlamydomonas reinhardtii. the role of stt7 protein kinase
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10113551/
https://www.ncbi.nlm.nih.gov/pubmed/37089643
http://dx.doi.org/10.3389/fpls.2023.1051711
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