The reactivation of nitrate reductase from spinach (Spinacea oleracea L.) inactivated by NADH and cyanide: effects of peroxidase and associated systems

Planta ◽  
1982 ◽  
Vol 156 (4) ◽  
pp. 289-294 ◽  
Author(s):  
J. M. Maldonado ◽  
B. A. Notton ◽  
E. J. Hewitt
Keyword(s):  
Nitrate Reductase ◽  
Spinacea Oleracea

Effets d'un éclairage d'appoint sur la croissance et le métabolisme azoté primaire de la laitue mâche et de l'épinard cultivés en serre

1999 ◽  
Vol 79 (3) ◽  
pp. 421-426 ◽  
Author(s):  
Hassan Chadjaâ ◽  
Louis-Philippe Vézina ◽  
André Gosselin
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
Climatic Conditions ◽  
Nitrate Accumulation ◽  
Artificial Lighting ◽  
Spinacea Oleracea ◽  
Supplementary Lighting ◽  
Nitrates Content ◽  
High Yields

Two cultivars of Lamb's lettuce (Valerianella sp. 'Valgros' et 'Vit') and one cultivar of spinach (Spinacea oleracea L. 'Martine RZ F1') were subjected to three light treatments. Two photoperiods, 12 h and 16 h were compared to natural light between January and April 1994. A photosynthetic flux of 50 µmol m–2 s–1 was provided as supplementary lighting using HPS lamps. The use of artificial lighting significantly increased biomass and nitrate reductase activity, while also reducing nitrate accumulation in leaves. The 16 h-photoperiod increased biomass and reduced nitrates content in leaves more than the 12 h photoperiod. In Lamb's lettuce, Valgos was more productive than Vit but accumulated more nitrates. The use of supplementary lighting gave high yields of lamb's lettuce and spinach in greenhouse under northern climatic conditions. Key words: Lamb's lettuce, spinach, nitrate reductase activity, nitrate, Valerianella sp., Spinacea oleracea L.

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