Short-term modulation of nitrate reductase activity by exogenous nitrate in Nicotiana plumbaginifolia and Zea mays leaves

Planta ◽  
1996 ◽  
Vol 199 (3) ◽  
Author(s):  
Sylvie Ferrario ◽  
Marie-H�l�ne Valadier ◽  
ChristineH. Foyer
Author(s):  
Xudong Zhang ◽  
Bastian L. Franzisky ◽  
Lars Eigner ◽  
Christoph‐Martin Geilfus ◽  
Christian Zörb

AbstractChloride (Cl−) is required for photosynthesis and regulates osmotic balance. However, excess Cl− application negatively interacts with nitrate ($${\mathrm{NO}}_{3}^{-}$$ NO 3 - ) uptake, although its effect on $${\mathrm{NO}}_{3}^{-}$$ NO 3 - metabolism remains unclear. The aim was to test whether Cl− stress disturbs nitrate reductase activity (NRA). A maize variety (Zea mays L. cv. LG 30215) was hydroponically cultured in a greenhouse under the following conditions: control (2 mM CaCl2), moderate Cl− (10 mM CaCl2), high Cl− (60 mM CaCl2). To substantiate the effect of Cl− stress further, an osmotic stress with lower intensity was induced by 60 g polyethylene glycol (PEG) 6000 L−1 + 2 mM CaCl2), which was 57% of the osmotic pressure being produced by 60 mM CaCl2. Results show that high Cl− and PEG-induced osmotic stress significantly reduced shoot biomass, stomatal conductance and transpiration rate, but NRA was only decreased by high Cl− stress. The interference of NRA in chloride-stressed maize is supposed to be primarily caused by the antagonistic uptake of Cl− and $${\mathrm{NO}}_{3}^{-}$$ NO 3 - .


Biochimie ◽  
1987 ◽  
Vol 69 (6-7) ◽  
pp. 735-742 ◽  
Author(s):  
Christian Meyer ◽  
Isabelle Cherel ◽  
Thérèse Moureaux ◽  
Jackson Hoarau ◽  
Jérôme Gabard ◽  
...  

1987 ◽  
Vol 84 (1) ◽  
pp. 67-72 ◽  
Author(s):  
C. Saux ◽  
Y. Lemoine ◽  
A. Marion-Poll ◽  
M. H. Valadier ◽  
M. Deng ◽  
...  

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