scholarly journals PGRL1 Participates in Iron-induced Remodeling of the Photosynthetic Apparatus and in Energy Metabolism in Chlamydomonas reinhardtii

2009 ◽  
Vol 284 (47) ◽  
pp. 32770-32781 ◽  
Author(s):  
Dimitris Petroutsos ◽  
Aimee M. Terauchi ◽  
Andreas Busch ◽  
Ingrid Hirschmann ◽  
Sabeeha S. Merchant ◽  
...  
Keyword(s):  
Energy Metabolism ◽  
Chlamydomonas Reinhardtii ◽  
Photosynthetic Apparatus

scholarly journals Nitric Oxide Remodels the Photosynthetic Apparatus upon S-Starvation in Chlamydomonas reinhardtii

2018 ◽  
Vol 179 (2) ◽  
pp. 718-731 ◽  
Author(s):  
Marcello De Mia ◽  
Stéphane D. Lemaire ◽  
Yves Choquet ◽  
Francis-André Wollman
Keyword(s):  
Nitric Oxide ◽  
Chlamydomonas Reinhardtii ◽  
Photosynthetic Apparatus

scholarly journals Association of Ferredoxin:NADP+ oxidoreductase with the photosynthetic apparatus modulates electron transfer in Chlamydomonas reinhardtii

2017 ◽  
Vol 134 (3) ◽  
pp. 291-306 ◽  
Author(s):  
Laura Mosebach ◽  
Claudia Heilmann ◽  
Risa Mutoh ◽  
Philipp Gäbelein ◽  
Janina Steinbeck ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Chlamydomonas Reinhardtii ◽  
Photosynthetic Apparatus

Changes in the photosynthetic apparatus and lipid droplet formation in Chlamydomonas reinhardtii under iron deficiency

2018 ◽  
Vol 139 (1-3) ◽  
pp. 253-266 ◽  
Author(s):  
Elsinraju Devadasu ◽  
Dinesh Kumar Chinthapalli ◽  
Nisha Chouhan ◽  
Sai Kiran Madireddi ◽  
Girish Kumar Rasineni ◽  
...  
Keyword(s):  
Iron Deficiency ◽  
Chlamydomonas Reinhardtii ◽  
Lipid Droplet ◽  
Photosynthetic Apparatus ◽  
Droplet Formation ◽  
Lipid Droplet Formation

scholarly journals Copper excess-induced large reversible and small irreversible adaptations in a population of Chlamydomonas reinhardtii CW15 (Chlorophyta)

2018 ◽  
Vol 87 (1) ◽  
Author(s):  
Bartosz Pluciński ◽  
Andrzej Waloszek ◽  
Joanna Rutkowska ◽  
Kazimierz Strzałka
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Copper Concentration ◽  
Photosynthetic Apparatus ◽  
Cellular Level ◽  
Copper Tolerance ◽  
Control Population ◽  
Copper Stress ◽  
Elevated Concentration ◽  
Adaptive Value ◽  
Dim Light

<p>Two <em>Chlamydomonas reinhardtii</em> CW15 populations modified by an excess of copper in growth medium were obtained: a “Cu” population that was continuously grown under the selection pressure of 5 µM Cu<sup>2+</sup> (for at least 48 weeks) and the “Re” population, where a relatively short (9 week) exposure to elevated copper, necessary for acquiring tolerance, was followed by a prolonged period (at least 39 weeks) of cultivation at a normal (0.25 µM) copper concentration.</p><p>Cells of the Cu population were able to multiply at a Cu<sup>2+</sup> concentration 16 times higher than that of the control population at a normal light intensity and at a Cu<sup>2+</sup> concentration 64 times higher when cultivated in dim light. The potential quantum yield of photosystem II (F<sub>V</sub>/F<sub>M</sub> ratio) under copper stress was also significantly higher for the Cu population than for Re and control populations.</p><p>The Re population showed only residual tolerance towards the elevated concentration of copper, which is revealed by an F<sub>V</sub>/F<sub>M</sub> ratio slightly higher than in the control population under Cu<sup>2+</sup> stress in dim light or in darkness.</p><p>We postulate that in the <em>Chlamydomonas populations</em> studied in this paper, at least two mechanisms of copper tolerance operate. The first mechanism is maintained during cultivation at a standard copper concentration and seems to be connected with photosynthetic apparatus. This mechanism, however, has only low adaptive value under excess of copper. The other mechanism, with a much higher adaptive value, is probably connected with Cu<sup>2+</sup> homeostasis at the cellular level, but is lost during cultivation at a normal copper concentration.</p>

scholarly journals Insights into the Survival of Chlamydomonas reinhardtii during Sulfur Starvation Based on Microarray Analysis of Gene Expression

2004 ◽  
Vol 3 (5) ◽  
pp. 1331-1348 ◽  
Author(s):  
Zhaoduo Zhang ◽  
Jeff Shrager ◽  
Monica Jain ◽  
Chiung-Wen Chang ◽  
Olivier Vallon ◽  
...  
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Photosynthetic Apparatus ◽  
Metabolic Processes ◽  
Sulfur Deprivation ◽  
Sulfur Starvation ◽  
Photosynthetic Organisms ◽  
A Genome ◽  
Genome Level ◽  
Microarray Analyses ◽  
Intracellular Proteolysis

ABSTRACT Responses of photosynthetic organisms to sulfur starvation include (i) increasing the capacity of the cell for transporting and/or assimilating exogenous sulfate, (ii) restructuring cellular features to conserve sulfur resources, and (iii) modulating metabolic processes and rates of cell growth and division. We used microarray analyses to obtain a genome-level view of changes in mRNA abundances in the green alga Chlamydomonas reinhardtii during sulfur starvation. The work confirms and extends upon previous findings showing that sulfur deprivation elicits changes in levels of transcripts for proteins that help scavenge sulfate and economize on the use of sulfur resources. Changes in levels of transcripts encoding members of the light-harvesting polypeptide family, such as LhcSR2, suggest restructuring of the photosynthetic apparatus during sulfur deprivation. There are also significant changes in levels of transcripts encoding enzymes involved in metabolic processes (e.g., carbon metabolism), intracellular proteolysis, and the amelioration of oxidative damage; a marked and sustained increase in mRNAs for a putative vanadium chloroperoxidase and a peroxiredoxin may help prolong survival of C. reinhardtii during sulfur deprivation. Furthermore, many of the sulfur stress-regulated transcripts (encoding polypeptides associated with sulfate uptake and assimilation, oxidative stress, and photosynthetic function) are not properly regulated in the sac1 mutant of C. reinhardtii, a strain that dies much more rapidly than parental cells during sulfur deprivation. Interestingly, sulfur stress elicits dramatic changes in levels of transcripts encoding putative chloroplast-localized chaperones in the sac1 mutant but not in the parental strain. These results suggest various strategies used by photosynthetic organisms during acclimation to nutrient-limited growth.

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