The effect of nitrate and plant size on nitrate uptake and in vitro nitrate reductase activity in strawberry (Fragaria×ananassa cv. Selva)

2007 ◽  
Vol 112 (4) ◽  
pp. 393-398 ◽  
Author(s):  
Toktam Sadat Taghavi ◽  
Mesbah Babalar
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Nitrate Uptake ◽  
Reductase Activity ◽  
Plant Size ◽  
Fragaria Ananassa

Effects of Glufosinate on Anion Uptake in Lemna gibba G 1

1989 ◽  
Vol 44 (1-2) ◽  
pp. 33-38 ◽  
Author(s):  
Gudrun D. Trogisch ◽  
Helmut Köcher ◽  
Wolfram R. Ullrich
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Nitrate Uptake ◽  
Dark Respiration ◽  
Reductase Activity ◽  
Lemna Gibba ◽  
Proton Cotransport ◽  
Chlorophyll Formation

Abstract The duckweed Lemna gibba G 1 was used as a model to study inhibitory sites with the herbicide and glutamate analogue glufosinate (PPT). Growth and chlorophyll formation were partly inhibited by 25 n-M, completely suppressed by 250 (im PPT. Photosynthesis showed partial inhibition within few hours, dark respiration ( 0 2 consumption) increased already within one hour. In the presence of 1 mM PPT in the light, the ammonium pool of Lemna increased to 600% within few hours, later to 1000%. The overall amino acid pool exhibited a slower increase to 300%, the nitrate pool only a slight increase, while total phosphate remained almost unchanged. In the dark all these effects were less pronounced than in the light. Nitrate, nitrite and phosphate uptake were partially inhibited by PPT, especially after 19 h PPT pretreatment. Nitrate reductase activity in vitro, after PPT treatment in vivo, showed an inhibition similar to that of nitrate uptake. Ammonium was not taken up but released under the same conditions. The data are explained by a combined effect of PPT, by inhibition of glutamine synthetase leading to accumulation of ammonium from photorespiration and proteolysis, by membrane depolarization and inhibition of anion/proton cotransport, by secondary uncoupling of phosphorylation, and by secondary inhibition of nitrate reductase activity.

scholarly journals Effects of Nitrite, Chlorate, and Chlorite on Nitrate Uptake and Nitrate Reductase Activity

1992 ◽  
Vol 100 (2) ◽  
pp. 644-650 ◽  
Author(s):  
M. Yaeesh Siddiqi ◽  
Bryan J. King ◽  
Anthony D. M. Glass
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Nitrate Uptake ◽  
Reductase Activity

scholarly journals Induction of nitrate uptake and nitrate reductase activity in trembling aspen and lodgepole pine

1998 ◽  
Vol 21 (10) ◽  
pp. 1039-1046 ◽  
Author(s):  
X. Min ◽  
M. Y. Siddiqi ◽  
R. D. Guy ◽  
A. D. M. Glass ◽  
H. J. Kronzucker
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Nitrate Uptake ◽  
Lodgepole Pine ◽  
Reductase Activity ◽  
Trembling Aspen
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