QUANTITATION OF PHOTOSYSTEM II ACTIVITY IN SPINACH CHLOROPLASTS. EFFECT OF ARTIFICIAL QUINONE ACCEPTORS

1987 ◽  
Vol 46 (4) ◽  
pp. 543-550 ◽  
Author(s):  
Steven McCauley ◽  
Anastasios Melis
Keyword(s):  
Photosystem Ii ◽  
Quinone Acceptors ◽  
Spinach Chloroplasts ◽  
Photosystem Ii Activity

The Site of Ferricyanide Photoreduction in the Lamellae of Isolated Spinach Chloroplasts: A Cytochemical Study

1971 ◽  
Vol 9 (2) ◽  
pp. 289-303
Author(s):  
D. O. HALL ◽  
H. EDGE ◽  
M. KALINA
Keyword(s):  
Electron Microscope ◽  
Photosystem Ii ◽  
Copper Ions ◽  
Sodium Ascorbate ◽  
Cytochemical Study ◽  
Spinach Chloroplasts ◽  
Photosystem Ii Activity ◽  
Zero Time

Ferricyanide was used as a Hill oxidant to localize the site of photoreduction in chloroplast lamellae. The ferrocyanide formed on illumination was complexed with copper ions to form insoluble, electron-dense precipitates of Cu ferrocyanide, which can be easily seen in unstained preparations in the electron microscope. Control experiments showed no precipitates in the dark, at zero time, in the absence of ferricyanide, or on addition of sodium ascorbate. Discrete precipitates of Cu ferrocyanide were seen on both stroma and grana lamellae. It is concluded that both stroma and grana lamellae have photosystem II activity necessary for reduction of ferricyanide.

The PsbJ protein is required for photosystem II activity in centers lacking the PsbO and PsbV lumenal subunits

2021 ◽  
Author(s):  
Priscilla Choo ◽  
Jack A. Forsman ◽  
Liangliang Hui ◽  
Ei Phyo Khaing ◽  
Tina C. Summerfield ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Photosystem Ii Activity

Inhibitions of photosystem II activity by proton gradient

1994 ◽  
Vol 1185 (3) ◽  
pp. 279-283 ◽  
Author(s):  
Alexander M. Ehrenheim ◽  
Giovanni Finazzi ◽  
Giorgio Forti
Keyword(s):  
Photosystem Ii ◽  
Proton Gradient ◽  
Photosystem Ii Activity

Changes in Photosystem II Activity and Leaf Reflectance Features of Several Subtropical Woody Plants Under Simulated SO2Treatment

2006 ◽  
Vol 48 (11) ◽  
pp. 1274-1286 ◽  
Author(s):  
Nan Liu ◽  
Chang-Lian Peng ◽  
Zhi-Fang Lin ◽  
Gui-Zhu Lin ◽  
Ling-Ling Zhang ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Woody Plants ◽  
Leaf Reflectance ◽  
Photosystem Ii Activity

scholarly journals Appreciation of tolerance at the impact of thermal stress on photosystem ii activity in the leaves of pedunculate oak (Quercus robur L.) trees of different ecological origin

2021 ◽  
Vol 13 (1(22)) ◽  
pp. 13-20
Author(s):  
Petru Cuza ◽  
Keyword(s):  
Thermal Stress ◽  
Photosystem Ii ◽  
Quercus Robur ◽  
Central Area ◽  
Extreme Weather Events ◽  
Pedunculate Oak ◽  
Adaptation Capacity ◽  
Oak Trees ◽  
Photosystem Ii Activity ◽  
The Impact

Extreme weather events with high temperatures and strong sunlight have increased alarmingly in the last few decades, considerable affecting plant photosynthesis. In this study, the impact of thermal stress on photosystem II activity in the leaves of pedunculate oak trees (Quercus robur L.) of different ecological origin was assessed. Four days after the thermal shock application with a temperature of 50°C during 20, 40, 60 minutes, the processes of recovery on photosystem II activity in the leaves of the oak trees in the investigated provenances took place with different speed and fullness. The recovery of the functional state of photosystem II in the leaves of the trees showed that in the environmental conditions of the ,,Plaiul Fagului” reservation territory an advanced thermotolerance to the thermal stress action was specifi c for the origin from the north of the country (Edinet). The leaves of the trees of local and southern origin showed a low resistance to the thermal stress action. The advanced adaptation capacity, the high growth rate of the trees from the northern provenance suggest that the acorn harvested from the oaks of northern origin can be used for the works of extension of the afforestation areas in the central area of the Republic of Moldova.

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