scholarly journals Alternative photosynthetic electron transport pathways during anaerobiosis in the green alga Chlamydomonas reinhardtii

2011 ◽  
Vol 1807 (8) ◽  
pp. 919-926 ◽  
Author(s):  
Anja Hemschemeier ◽  
Thomas Happe
Keyword(s):  
Electron Transport ◽  
Chlamydomonas Reinhardtii ◽  
Green Alga ◽  
Photosynthetic Electron Transport ◽  
Transport Pathways

scholarly journals The Regulation of Photosynthetic Electron Transport during Nutrient Deprivation in Chlamydomonas reinhardtii

1998 ◽  
Vol 117 (1) ◽  
pp. 129-139 ◽  
Author(s):  
Dennis D. Wykoff ◽  
John P. Davies ◽  
Anastasios Melis ◽  
Arthur R. Grossman
Keyword(s):  
Electron Transport ◽  
Chlamydomonas Reinhardtii ◽  
Photosynthetic Electron Transport ◽  
Nutrient Deprivation

Inhibition of Photosynthetic Electron Transport in Tobacco Chloroplasts and Thylakoids of the Blue Green Alga Oscillatoria chalybea by an Antiserum to Synthetic Zeaxanthin

1979 ◽  
Vol 34 (12) ◽  
pp. 1218-1221 ◽  
Author(s):  
Ursula Lehmann-Kirk ◽  
Klaus P. Bader ◽  
Georg H. Schmid ◽  
Alfons Radunz
Keyword(s):  
Electron Transport ◽  
Green Alga ◽  
Photosynthetic Electron Transport ◽  
Blue Green Alga ◽  
Diphenyl Carbazide ◽  
Oscillatoria Chalybea ◽  
Oxygen Evolving ◽  
Electron Donation ◽  
New Evidence ◽  
Tetramethyl Benzidine

An antiserum to synthetic Zeaxanthin inhibits photosynthetic electron transport on the oxygen-evolving side of photosystem II in tobacco chloroplasts and thylakoids of the filamentous blue-green alga Oscillatoria chalybea. The inhibition site lies for both species between the site of electron donation of water or tetramethyl benzidine and that of diphenyl carbazide or manganese II ions. Typical photosystem I reactions are not impaired by the antiserum. The effect of the antiserum concerning the inhibition site is practically identical to that of the earlier described antiserum to violaxanthin. However, the degree of inhibition seems to be generally somewhat lower with the antiserum to Zeaxanthin, than with that to violaxanthin which hints at a lesser accessibility of zeaxanthin, in the tylakoid membrane in comparison to violaxanthin. In the course of these investigations new evidence was obtained that the oxygen-evolving side of the electron transport scheme is differently organized in Oscillatoria chalybea when compared to tobacco chloroplasts. Thus, the silicomolybdate reduction with water as the electron donor is sen­sitive to DCMU in these algae.

scholarly journals Photosynthetic electron transport in a cell-free preparation from the thermophilic blue-green alga Phormidium laminosum

1980 ◽  
Vol 188 (2) ◽  
pp. 351-361 ◽  
Author(s):  
A C Stewart ◽  
D S Bendall
Keyword(s):  
Electron Transport ◽  
Cytochrome C ◽  
Green Alga ◽  
Photosynthetic Electron Transport ◽  
High Potential ◽  
O2 Evolution ◽  
Blue Green Alga ◽  
Phormidium Laminosum ◽  
A Cell ◽  
Membrane Bound

1. A cell-free preparation of membrane fragments was prepared from the thermophilic blue-green alga Phormidium laminosum by lysozyme treatment of the cells followed by osmotic shock to lyse the spheroplasts. The membrane fragments showed high rates of photosynthetic electron transport and O2 evolution (180-250 mumol of O2/h per mg of chlorophyll a with 2,6-dimethyl-1,4-benzoquinone as electron acceptor). O2-evolution activity was stable provided that cations (e.g. 10mM-Mg2+ or 100mM-Na+) or glycerol (25%, v/v) were present in the suspending medium. 2. The components of the electron-transport chain in P. laminosum were similar to those of other blue-green algae: the cells contained Pigment P700, plastocyanin, soluble high-potential cytochrome c-553, soluble low-potential cytochrome c-54 and membrane-bound cytochromes f, b-563 and b-559 (both low- and high-potential forms). The amounts and midpoint potentials of the membrane-bound cytochromes were similar to those in higher-plant chloroplasts. 3. Although O2 evolution in P. laminosum spheroplasts was resistant to high temperatures, thermal stability was not retained in the cell-free preparation. However, in contrast with higher plants, O2 evolution in P. laminosum membrane fragments was remarkably resistant to the non-ionic detergent Triton X-100.

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