1992
DOI: 10.1111/j.1469-8137.1992.tb01088.x
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A comparison of ammonium and nitrate as nitrogen sources for photolithotrophs

Abstract: summary Potential advantages of ammonium relative to nitrate assimilation (assuming equal nitrogen supply in the two forms), deduced from known biochemical pathways and the site of nitrate assimilation in vascular land plants, include (i) a greater maximum specific growth rate, (ii) lower costs of photons and (in transpiring plants) water per unit carbon assimilated, and (iii) lower costs of iron, manganese and molybdenum per unit carbon assimilated per unit time. Actual measurements show that the growth rate … Show more

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Cited by 202 publications
(152 citation statements)
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“…NH 4 ϩ is positively charged and adsorbs readily onto the cation-exchange capacity of temperate forest soils rendering NH 4 ϩ largely immobile. By contrast, glycine and NO 3 Ϫ are neutral and negatively charged, respectively; they do not adsorb as readily onto exchange sites in soil; and both forms are mobile in soil water, often moving to existing root surfaces through transpirational water (Raven et al 1992, Chapin et al 2002. Therefore, plants may not produce as many carriers for the uptake of glycine and NO 3 Ϫ as they might for NH 4 ϩ , giving rise to the pattern of N uptake observed in this study.…”
Section: Discussionmentioning
confidence: 65%
“…NH 4 ϩ is positively charged and adsorbs readily onto the cation-exchange capacity of temperate forest soils rendering NH 4 ϩ largely immobile. By contrast, glycine and NO 3 Ϫ are neutral and negatively charged, respectively; they do not adsorb as readily onto exchange sites in soil; and both forms are mobile in soil water, often moving to existing root surfaces through transpirational water (Raven et al 1992, Chapin et al 2002. Therefore, plants may not produce as many carriers for the uptake of glycine and NO 3 Ϫ as they might for NH 4 ϩ , giving rise to the pattern of N uptake observed in this study.…”
Section: Discussionmentioning
confidence: 65%
“…In many natural environments low concentrations of ammonium represent the main nitrogen source. However, as a consequence of human activity, nitrate is dominant in many habitats (Raven et al, 1992). Thus a study of the assimilatory reduction of nitrate can provide valuable information on the strategies adopted by different photoautotrophs in order to proliferate.…”
Section: mentioning
confidence: 99%
“…This dependency may be enhanced by the elevated pH in sea-ice brines increasing the dissociation of ammonium to ammonia that can diffuse directly into cells. (18,19). Ammonium levels can be as high as 150 M in sea ice (in seawater the values are generally Ͻ1 M), and such concentrations will also inhibit the assimilation of nitrate, owing to the inactivation of nitrate reductase by glutamine produced during the assimilation of ammonia (20).…”
Section: S C I E N C E ' S C O M P a S Smentioning
confidence: 99%