Inhibitor-dependent stimulation of photosynthetic electron transport by far-red light in NO3−-and NH4+-grown plants of Phaseolus vulgaris L.

2001 ◽  
pp. 102-103
Author(s):  
K. Schinner ◽  
B. Sattelmacher ◽  
U.-P. Hansen
Keyword(s):  
Electron Transport ◽  
Phaseolus Vulgaris ◽  
Red Light ◽  
Photosynthetic Electron Transport ◽  
Phaseolus Vulgaris L ◽  
Stimulation Of

Red and Far‐Red Light Effects on Climbing in Phaseolus vulgaris L. 1

Crop Science ◽  
1977 ◽  
Vol 17 (5) ◽  
pp. 797-799 ◽  
Author(s):  
Paul J. Kretchmer ◽  
J. L. Ozbun ◽  
Stuart L. Kaplan ◽  
D. R. Laing ◽  
D. H. Wallace
Keyword(s):  
Phaseolus Vulgaris ◽  
Red Light ◽  
Phaseolus Vulgaris L ◽  
Light Effects

scholarly journals The effects of oxygen solubility and high concentrations of salts on photosynthetic electron transport in chloroplast membranes

1984 ◽  
Vol 218 (2) ◽  
pp. 539-545 ◽  
Author(s):  
B Thomasset ◽  
J N Barbotin ◽  
D Thomas
Keyword(s):  
Electron Transport ◽  
Photosynthetic Electron Transport ◽  
Potassium Citrate ◽  
Potassium Ferricyanide ◽  
O2 Evolution ◽  
Oxygen Solubility ◽  
Chloroplast Membranes ◽  
Ferricyanide Reduction ◽  
High Concentrations ◽  
Stimulation Of

Chloroplast membranes were isolated in different media containing Hepes [4-(2-hydroxyethyl)-1-piperazine-ethanesulphonic acid] and high concentrations of sorbitol (0.33 M), potassium citrate (0.75 M) or Na2SO4 (1.0 M). Due to the complexity of the media, the oxygen solubility is strongly modified by high concentrations of salts (oxygen solubility for 0.33 M-sorbitol, 0.21 mmol/litre; for 0.75 M-potassium citrate, 0.121 mmol/litre; and for 1.0 M-Na2SO4, 0.112 mmol/litre). The knowledge of these values is necessary to interpret the rate of O2 evolution. For thylakoids isolated in ‘sorbitol buffer’ and then tested in high concentrations of potassium citrate, a slight stimulation of O2 evolution is observed (143-173 mumol of O2/h per mg of chlorophyll a) with potassium ferricyanide as electron acceptor. When we monitor the potassium ferricyanide reduction, no stimulation of electron transport is obtained even if the observed phenomenon is identical with the Photosystem-II oxygen evolution. In the same experiments no stimulation of the photophosphorylation was recorded, but when thylakoids are directly isolated in 0.75 M-potassium citrate, O2 evolution, ferricyanide reduction and photophosphorylation are inhibited by high concentrations of salts. The behaviour of thylakoids seems to be influenced by their initial treatment.

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