scholarly journals A new approach for sustained and efficient H2 photoproduction by Chlamydomonas reinhardtii

2018 ◽  
Vol 11 (6) ◽  
pp. 1431-1436 ◽  
Author(s):  
Sergey Kosourov ◽  
Martina Jokel ◽  
Eva-Mari Aro ◽  
Yagut Allahverdiyeva
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Electron Flow ◽  
New Approach ◽  
Photosynthetic Electron Flow ◽  
H2 Photoproduction ◽  
Pulse Illumination

Pulse-illumination re-directs photosynthetic electron flow destined for CO2 fixation to [FeFe]-hydrogenase, thus sustaining algal H2 photoproduction for 70 hours.

scholarly journals Photosynthetic electron flow affects H2O2 signaling by inactivation of catalase in Chlamydomonas reinhardtii

Planta ◽  
2008 ◽  
Vol 228 (6) ◽  
pp. 1055-1066 ◽  
Author(s):  
Ning Shao ◽  
Christoph F. Beck ◽  
Stéphane D. Lemaire ◽  
Anja Krieger-Liszkay
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Electron Flow ◽  
Photosynthetic Electron Flow

Interaction of Photosystem II Herbicides with Bicarbonate and Formate in Their Effects on Photosynthetic Electron Flow

1984 ◽  
Vol 39 (5) ◽  
pp. 374-377 ◽  
Author(s):  
J. J. S. van Rensen
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Electron Flow ◽  
Photosynthetic Electron Transport ◽  
Hill Reaction ◽  
Amaranthus Hybridus ◽  
Apparent Affinity ◽  
Photosynthetic Electron Flow ◽  
Different Characteristics ◽  
The Hill

The reactivation of the Hill reaction in CO2-depleted broken chloroplasts by various concentrations of bicarbonate was measured in the absence and in the presence of photosystem II herbicides. It appears that these herbicides decrease the apparent affinity of the thylakoid membrane for bicarbonate. Different characteristics of bicarbonate binding were observed in chloroplasts of triazine-resistant Amaranthus hybridus compared to the triazine-sensitive biotype. It is concluded that photosystem II herbicides, bicarbonate and formate interact with each other in their binding to the Qв-protein and their interference with photosynthetic electron transport.

Non-Invasive Monitoring of the Light-Induced Cyclic Photosynthetic Electron Flow during Cold Hardening in Wheat Leaves

2006 ◽  
Vol 61 (9-10) ◽  
pp. 734-740 ◽  
Author(s):  
Simona Apostol ◽  
Gabriella Szalai ◽  
László Sujbert ◽  
Losanka P. Popova ◽  
Tibor Janda
Keyword(s):  
Winter Wheat ◽  
Electron Flow ◽  
Wheat Variety ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Light Conditions ◽  
Non Invasive ◽  
Photosynthetic Electron Flow ◽  
Temperature Hardening ◽  
Wheat Leaves

AbstractThe effect of irradiance during low temperature hardening was studied in a winter wheat variety. Ten-day-old winter wheat plants were cold-hardened at 5 °C for 11 days under light (250 μmol m-2 s-1) or dark (20 μmol m-2 s-1) conditions. The effectiveness of hardening was significantly lower in the dark, in spite of a slight decrease in the Fv/Fm chlorophyll fluorescence induction parameter, indicating the occurrence of photoinhibition during the hardening period in the light. Hardening in the light caused a downshift in the far-red induced AG (afterglow) thermoluminescence band. The faster dark re-reduction of P700+, monitored by 820-nm absorbance, could also be observed in these plants. These results suggest that the induction of cyclic photosynthetic electron flow may also contribute to the advantage of frost hardening under light conditions in wheat plants.

scholarly journals A Stepwise NaHSO3 Addition Mode Greatly Improves H2 Photoproduction in Chlamydomonas reinhardtii

2018 ◽  
Vol 9 ◽  
Author(s):  
Lanzhen Wei ◽  
Xin Li ◽  
Baoqiang Fan ◽  
Zhaoxing Ran ◽  
Weimin Ma
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
H2 Photoproduction

Antibodies to Chlorophyll and their Reactions with Chloroplast Preparations

1971 ◽  
Vol 26 (5) ◽  
pp. 435-446 ◽  
Author(s):  
Alfons Radunz ◽  
Georg H. Schmid ◽  
Wilhelm Menke
Keyword(s):  
Photosystem I ◽  
Electron Flow ◽  
Membrane Surface ◽  
Protein Composition ◽  
Inhibitory Effect ◽  
Hill Reaction ◽  
Protein Layer ◽  
Lamellar System ◽  
Light Reaction ◽  
Photosynthetic Electron Flow

Antibodies to chlorophyll are specifically adsorbed onto the membrane surface of thylakoids. The antibodies inhibit photosynthetic electron flow from water to NADP⊕. This inhibition is presumably caused by adsorption of the antibodies onto the centre chlorophyll of light reaction II. Fragments of the thylakoid membrane, obtained by ultrasonication and subsequent fractioning centrifugation, exhibit only photosystem-I activity. Conversely, the specific adsorption of antibodies to sensitizer chlorophyll has no inhibitory effect on electron transport. The ferricyanide Hill reaction of chloroplast preparations is inhibited by chlorophyll antibodies. From these observations it is concluded that the centre chlorophyll of light reaction II and at least part of the sensitizer chlorophyll is located on the surface of the thylakoids. As agglutination is sterically inhibited by the membrane protein, it is assumed that the chlorophyll is located in gaps or pores of the protein layer.Two fractions of the lamellar system exhibit photosystem I activity of different characteristic electron donor specificity. These fractions can be further distinguished in terms of their circular dichroism and protein composition.

Formate as an Inhibitor of Photosynthetic Electron Flow

1984 ◽  
Vol 39 (5) ◽  
pp. 386-388 ◽  
Author(s):  
Jan F. H. Snel ◽  
Dirk Naber ◽  
Jack J. S. van Rensen
Keyword(s):  
Inhibitory Action ◽  
Electron Flow ◽  
Hill Reaction ◽  
Maximal Inhibition ◽  
Photosynthetic Electron Flow ◽  
The Hill

The effects of formate on the Hill reaction in isolated broken pea chloroplasts were in­vestigated. Addition of formate to chloroplasts has two distinct effects: I. basal electron flow can be stimulated 3-fold; 2. uncoupled electron flow is inhibited. The stimulating effect is due to uncoupling by formate and appears instantaneous. Maximal inhibition by form ate is only observed after prolonged illumination. The inhibitory action of form ate on electron flow can be relieved by bicarbonate *.

scholarly journals Identification of Salt Stress Responding Genes Using Transcriptome Analysis in Green Alga Chlamydomonas reinhardtii

2018 ◽  
Vol 19 (11) ◽  
pp. 3359 ◽  
Author(s):  
Ning Wang ◽  
Zhixin Qian ◽  
Manwei Luo ◽  
Shoujin Fan ◽  
Xuejie Zhang ◽  
...  
Keyword(s):  
Salt Stress ◽  
Chlamydomonas Reinhardtii ◽  
Green Alga ◽  
Transcriptome Analysis ◽  
Stress Responses ◽  
Electron Flow ◽  
Saline Stress ◽  
Alternative Source ◽  
Salt Stress Response ◽  
Stress Responding

Salinity is one of the most important abiotic stresses threatening plant growth and agricultural productivity worldwide. In green alga Chlamydomonas reinhardtii, physiological evidence indicates that saline stress increases intracellular peroxide levels and inhibits photosynthetic-electron flow. However, understanding the genetic underpinnings of salt-responding traits in plantae remains a daunting challenge. In this study, the transcriptome analysis of short-term acclimation to salt stress (200 mM NaCl for 24 h) was performed in C. reinhardtii. A total of 10,635 unigenes were identified as being differently expressed by RNA-seq, including 5920 up- and 4715 down-regulated unigenes. A series of molecular cues were screened for salt stress response, including maintaining the lipid homeostasis by regulating phosphatidic acid, acetate being used as an alternative source of energy for solving impairment of photosynthesis, and enhancement of glycolysis metabolism to decrease the carbohydrate accumulation in cells. Our results may help understand the molecular and genetic underpinnings of salt stress responses in green alga C. reinhardtii.

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