scholarly journals The Response of the Phosphate Uptake System and the Organic Acid Exudation System to Phosphate Starvation in Sesbania rostrata

2001 ◽  
Vol 42 (11) ◽  
pp. 1253-1264 ◽  
Author(s):  
Toshihiro Aono ◽  
Naoki Kanada ◽  
Ayako Ijima ◽  
Hiroshi Oyaizu
Keyword(s):  
Organic Acid ◽  
Phosphate Uptake ◽  
Phosphate Starvation ◽  
Sesbania Rostrata ◽  
Uptake System ◽  
Organic Acid Exudation

Phosphate uptake by renal membrane vesicles of rabbits adapted to high and low phosphorus diets

1983 ◽  
Vol 245 (2) ◽  
pp. F175-F180 ◽  
Author(s):  
L. Cheng ◽  
C. T. Liang ◽  
B. Sacktor
Keyword(s):  
Transport System ◽  
Phosphate Uptake ◽  
Membrane Vesicles ◽  
Phosphate Transport ◽  
Uptake System ◽  
Low Phosphorus ◽  
Dietary Phosphate ◽  
Preferred Species ◽  
Uptake Medium ◽  
Phosphate Carrier

Renal adaptation to changes in phosphate intake was studied by comparing phosphate uptake by proximal tubule brush border membrane vesicles from rabbits on a relatively high or low phosphorus diet. The low phosphorus diet increased Na+ gradient-dependent phosphate uptake. Uptake in the absence of Na+ and in the presence of Na+, but no gradient, was not significantly affected. The phosphorus diet did not alter Na+ gradient-dependent D-glucose and L-proline uptake. The low phosphorus diet increased Vmax; affinity for phosphate was not appreciably changed. At all concentrations of extravesicular Na+, phosphate uptake was higher in membrane vesicles from animals fed the low phosphorus diet; the kinetics of the phosphate uptake system, with respect to Na+, was also altered by the change in dietary phosphate. These findings suggest that adaptation involves an alteration in the rate of translocation of the Na+-phosphate carrier when energized by a Na+ gradient driving force rather than a change in the number of Na+-phosphate carrier sites. With membrane vesicles from rabbits fed a low phosphorus diet, phosphate uptake increased several-fold when the pH of the uptake medium was raised, whereas with membrane vesicles from animals fed a high phosphorus diet the enhancement of uptake with alkalinization was relatively small. Irrespective of the diet, divalent phosphate was the probable preferred species for transport. Dietary adaptation was associated, however, with an alteration in the pH dependency of the transport system per se. These findings provide evidence that the adaptation of the kidney phosphate transport system to dietary phosphate load involves an intrinsic change in the Na+-phosphate carrier.

Elucidating silicon-mediated distinct morpho-physio-biochemical attributes and organic acid exudation patterns of cadmium stressed Ajwain (Trachyspermum ammi L.)

2020 ◽  
Vol 157 ◽  
pp. 23-37 ◽  
Author(s):  
Muhammad Tariq Javed ◽  
Muhammad Hamzah Saleem ◽  
Sidra Aslam ◽  
Muzammal Rehman ◽  
Naeem Iqbal ◽  
...  
Keyword(s):  
Organic Acid ◽  
Trachyspermum Ammi ◽  
Organic Acid Exudation

Aluminum (Al)-induced organic acid exudation in an Al-accumulating species from the Brazilian savanna

Trees ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 155-162 ◽  
Author(s):  
Brenda Mistral de Oliveira Carvalho Bittencourt ◽  
Carolina de Marchi Santiago da Silva ◽  
Sebastião Zanão Filho ◽  
Gustavo Habermann
Keyword(s):  
Organic Acid ◽  
Brazilian Savanna ◽  
Organic Acid Exudation
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