scholarly journals Effect of pesticides on the growth, photosynthetic oxygen evolution and nitrogen fixation of Westiellopsis prolifica.

1989 ◽  
Vol 35 (4) ◽  
pp. 319-325 ◽  
Author(s):  
SIBA P. ADHIKARY
Keyword(s):  
Nitrogen Fixation ◽  
Oxygen Evolution ◽  
Photosynthetic Oxygen Evolution ◽  
Westiellopsis Prolifica ◽  
Photosynthetic Oxygen

Photosynthesis and nitrogenase activity in the blue-green alga Gloeocapsa

1974 ◽  
Vol 20 (12) ◽  
pp. 1633-1637 ◽  
Author(s):  
J. R. Gallon ◽  
T. A. LaRue ◽  
W. G. W. Kurz
Keyword(s):  
Nitrogen Fixation ◽  
Oxygen Evolution ◽  
Green Alga ◽  
Photosynthetic Pigments ◽  
Nitrogenase Activity ◽  
Photosynthetic Oxygen Evolution ◽  
Blue Green Alga ◽  
Temporal Separation ◽  
Young Culture ◽  
Photosynthetic Oxygen

In a young culture, photosynthetic-oxygen evolution by Gloeocapsa is at a low level while nitrogenase activity is at its greatest. When the culture ages, there is a rapid increase in photosynthetic pigments and oxygen evolution, and nitrogenase activity decreases. The temporal separation of nitrogen fixation and photosynthesis may serve to protect nitrogenase from oxygen denaturation.

Nitrogen fixation and photosynthetic oxygen evolution in cyanobacteria

2003 ◽  
Vol 154 (3) ◽  
pp. 157-164 ◽  
Author(s):  
Ilana Berman-Frank ◽  
Pernilla Lundgren ◽  
Paul Falkowski
Keyword(s):  
Nitrogen Fixation ◽  
Oxygen Evolution ◽  
Photosynthetic Oxygen Evolution ◽  
Photosynthetic Oxygen

scholarly journals TIP family aquaporins play role in chloroplast osmoregulation and photosynthesis

2020 ◽  
Author(s):  
Azeez Beebo ◽  
Ahmad Zia ◽  
Christopher R. Kinzel ◽  
Andrei Herdean ◽  
Karim Bouhidel ◽  
...  
Keyword(s):  
Electron Transport ◽  
Oxygen Evolution ◽  
Photosynthetic Electron Transport ◽  
Chloroplast Envelope ◽  
Photosynthetic Oxygen Evolution ◽  
Wild Type ◽  
Thylakoid Lumen ◽  
Photosynthetic Oxygen ◽  
Osmotic Treatment ◽  
Envelope Membranes

SUMMARYPhotosynthetic oxygen evolution by photosystem II requires water supply into the chloroplast to reach the thylakoid lumen. A rapid water flow is also required into the chloroplast for optimal oxygen evolution and to overcome osmotic stress. The mechanisms governing water transport in chloroplasts are largely unexplored. Previous proteomics indicated the presence of three aquaporins from the tonoplast intrinsic protein (TIP) family, TIP1;1, TIP1;2 and TIP2;1, in chloroplast membranes of Arabidopsis thaliana. Here we revisited their location and studied their role in chloroplasts. Localization experiments indicated that TIP2;1 resides in the thylakoid, whereas TIP1;2 is present in both thylakoid and envelope membranes. Mutants lacking TIP1;2 and/or TIP2;1 did not display a macroscopic phenotype when grown under standard conditions. The mutant chloroplasts and thylakoids underwent less volume changes than the corresponding wild type preparations upon osmotic treatment and in the light. Significantly reduced rates of photosynthetic electron transport were obtained in the mutant leaves, with implications on the CO2 fixation rates. However, electron transport rates did not significantly differ between mutants and wild type when isolated thylakoids were examined. Less acidification of the thylakoid lumen was measured in mutants thylakoids, resulting in a slower induction of delta pH-dependent photoprotective mechanisms. These results identify TIP1;2 and TIP2;1 as chloroplast proteins and highlight their importance for osmoregulation and optimal photosynthesis. A third aquaporin, TIP1;1, is present in the chloroplast envelope, and may play role in photosynthesis under excessive light conditions, as based on the weak photosynthetic phenotype of its mutant.

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