Effect of Sewage Irrigation on Nitrate Accumulation and Nitrate Reductase Activity in Leafy Vegetables

2011 ◽  
Vol 15 (1) ◽  
pp. 34-38 ◽  
Author(s):  
Archana H. Thite ◽  
Geetha S. Menon
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
Leafy Vegetables ◽  
Sewage Irrigation ◽  
Nitrate Accumulation

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.

scholarly journals Nitrate Accumulation and Reduction in Papaw Fruits

1972 ◽  
Vol 25 (3) ◽  
pp. 531 ◽  
Author(s):  
RC Menary ◽  
RH Jones
Keyword(s):  
Nitrate Reductase ◽  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
Phloem Transport ◽  
Fruit Maturation ◽  
Ripe Fruit ◽  
Nitrate Accumulation ◽  
Xylem Transport ◽  
Colour Changes ◽  
Green Stage

Nitrate reductase activity was present in roots, stems, leaves, and fruits of the papaw. In fruits, the location and activity of nitrate reductase varied with stage of maturation. Nitrate reductase activity was induced in the exocarp of green and mature green fruits by light and light plus exogenous nitrate. The endogenous nitrate in the exocarp of ripe fruit was not available for reduction and hence no induction occurred in the presence of light only. As fruit tissues comll1enced to show colour changes, there was a marked loss in their nitrate reductase activity. At the mature green stage of maturity, phloem transport appeared to predominate over xylem transport and this reduced the net influx of nitrate to fruit. The levels of nitrate observed in fruits at various stages of maturity may be explained in terms of the following: changes in nitrate reductase activity associated with fruit maturation; the availability of endogenous nitrate for reduction; factors controlling the net influx of nitrate into fruits and distribution of nitrate within fruits.

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