Nitrate uptake

Dortch, Q. (1990). The interactions between ammonium and nitrate uptake in phytoplankton. Mar. Ecol. Prog. Ser. 61,183-201. 

M. C. Drew, L. R. Saker, Nutrient supply and the growth of the seminal root system in barley II. Localized compensatory changes in lateral root growth and the rates of nitrate uptake when nitrate is restricted to only one part of the root system. J. E.xp. Bot. 26 79 (1976). 

N. M. Crawford and A. D. M. Glass, Molecular and physiological aspects of nitrate uptake in plants. Trends Plant Sci. 3 389 (1998). 

A. Piccolo, S. Nardi, and G. Concheri, Structural characteristics of humic substances as related to nitrate uptake and growth regulation in plant systems. Soil Biol. Bio-chem. 24 313 (1992). 

G. Cacco, E. Attina, A. Gelsomino, and M. Sidari, Effect of nitrate and humic substances of different molecular size on kinetic parameters of nitrate uptake rate in wheat. seedlings. 3. Plant Nittr. Soil Sci. 763 313 (2000). 

H. Mar.schner, M. Haussling, and E. George, Ammonium and nitrate uptake rates and rhizoshpere-pH in non-mycorrhizal roots of Norway spruce [Picea ahies (L.) Karst.). Trees Struct. Funct. 5 14 (1991). 

Figure 18 Simulated uptake of nitrate from a "patchy soil. The relative nitrate distribution from held data is shown in D. In A, the plant roots were allowed to respond in a plastic fashion to local resource availability while B shows the nonplastic response both plots show the relative nitrate uptake over the 0.5m area C. The total nitrate acquired in each plot. Pla-stic roots acquired 61% more nitrate during the 2-day simulation, (From Ref. 88.)...

C. Abbes, J. L. Robert, and L. E. Parent, Mechanistic modeling of coupled ammonium and nitrate uptake by onions using the finite element method. Soil Sci. Soc. Am. J. 60 1160 (1996). 

Anoxic conditions in wastewater of sewer networks require availability of nitrate or other oxidized nitrogen compounds and an extremely low DO concentration. Such conditions are generally not of major importance because of the low nitrate concentrations that typically occur in wastewater. However, anoxic conditions in sewers are artificially established when nitrate is used to control sulfide problems (Section 6.2.7). A low nitrate uptake rate (NUR) is preferred, in this case, to keep the nitrate consumption low for economic reasons. 

The microbial activity of wastewater under anoxic conditions is lower compared with aerobic conditions (Abdul-Talib et al., 2001). This is important to consider, because a low nitrate uptake rate (NUR) compared with the oxygen uptake rate (OUR) in units of electron equivalents means a reduced transformation rate of the most biodegradable fractions of the organic matter. As mentioned under the point on injection of air, this may have implications in terms of treatment. Furthermore, a relatively low NUR value also has operational advantages because of a reduced demand for nitrate to suppress sulfide formation. 

Concerning nitrate uptake and assimilation (Albuzio et al., 1986) in barley seedlings incubated with HS from a grassland soil and their fractions—nitrate reductase (NR), glutamate dehydrogenase (GDH),and glutamine synthetase (GS) activities— were analyzed together with the rate of nitrate uptake. The enzymatic activities turned out to be stimulated by the treatment of unfractioned humus extract with increases compared to controls of 65%, 35% and 45% respectively. 

Albuzio, A., Ferrari, G., and Nardi, S. (1986). Effects of humic substances on nitrate uptake and assimilation in barley seedlings. Can. J. Soil Sci. 66,731-736. 

Dell Agnola, G, and Nardi, S. (1987). Hormone-like effect of enhanced nitrate uptake induced by depolycondensed humic fractions obtained from Allolobophora rosea and A. caliginosa faeces. Biol. Fertil. Soils 4,115-118. 

Nardi, S., Concheri, G., Dell Agnola, G., and Scrimin, P. (1991). Nitrate uptake and ATPase activity in oat seedhngs in the presence of two humic fractions. Soil Biol. Biochem. 23, 833-836. 

Quaggiotti, S., Ruperti, B., Pizzeghello, D., Francioso, O., Tugnoli, V., and Nardi, S. (2004). Effect of low molecular size humic substances on nitrate uptake and expression of genes involved in nitrate transport in maize (Zea mays L.). J. Exp. Bot. 55, 803-813. 

Only 50% of total nitrogen was bound to sediment (Schreiber et al., 1980). Nitrate uptake appeared to be linear with distance from the source, with an average of 20% and 50% removal in the first 8 and 16m of buffer strip, respectively (Vought et al., 1994). Jordan et al. (1993) found that most of the drop in nitrate levels within the riparian zone occurred abruptly at the edge of a floodplain within the forest, where the water table was nearest the surface and strong reducing conditions existed. 

Haines, K. C. and Wheeler, P. A., Ammonium and nitrate uptake by the marine macrophytes Hypnea musciformis (Rhodophyta) and Macrocystis pyrifera (Phaeophyta), J. Phycol., 14, 319, 1978. 

Falkowski, P.G. (1975) Nitrate uptake in marine phytoplankton (Nitrate, chloride)-activated adenosine triphosphate from Skeletonema costatum (Bacillariophyceae). J. Phycol. 11, 323-326. 

Plassard,C., Barry, D.,Eltrop, L. Moussin, D. (1994). Nitrate uptake in maritime pine (Pihus sylvestris Soland in Ait.) and the ectomycorrhizal fungus Hebeloma cylindrosporum effect of ectomycorrhizal symbiosis. Canadian Journal of Botany, 72, 189-97. 

Beuve, N., Rispail, N., Laine, R, CUquet, J.B., Ourry, A. and Deunff, E.L. (2004) Putative role of Y-aminobutyric acid (GABA) as a long-distance signal in up-regulation of nitrate uptake in Brassica napus L. Plant Cell Environ., 27,1035-46. 

HoU, C., and Montoya, J. (2005). Interactions between nitrate uptake and nitrogen fixation in continuous cultures of the marine diazotroph, Trichodesmium. J. Phycol. 41, 1178—1183. 

Cochlan, W. P., and Harrison, P.. (1991a). Inhibition of nitrate uptake by ammonium and urea in the eukaryotic picoflageUate Micromonas pusilla (Butcher) Manton-Et-Parke. J. Exp. Mar. Biol. Ecol. 153, 143-152. 

CoUos, Y., Vaquer, A., Bibent, B., Slawyk, G., Cagcia, N., and Souchu, P. (1997). Variability in nitrate uptake kinetics of phytoplankton communities in a Mediterranean coastal lagoon. Estuar. Coast. 

Dickson, M. L., and Wheeler, P. A. (1995). Nitrate uptake rates in a coastal upwelhng regime A comparison of PN-specific, absolute, and Chi a-specific rates. Limnol. Oceanogr. 40, 533—543. 

Dortch, Q., Clayton, R. A., Thoresen, S., Bressler, S., and Ahmed, S. (1982). Response of marine phytoplankton to nitrogen deficiency Decreased nitrate uptake vs. enhanced ammonium uptake. Mar. Biol. 70, 13-19. 

Dortch, Q., Thompson, P. A., and Harrison, P. J. (1991h). Variability in nitrate uptake kinetics in Thalassiosira pseudonana (BaciUariophyceae). J. Phycol. 27, 35—39. 

Dugdale, R. C., and Wilkerson, F. P. (1991). Low specific nitrate uptake rate A common feature of high-nutrient low-chlorophyU marine ecosystems. Limnol. Oceanogr. 36, 1678—1688. 

Eppley, R. W., and Thomas, W. H. (1969). Comparison of half-saturation constants for growth and nitrate uptake of marine phytoplankton. J. Phycol. 5, 375—379. 

---