Nitrogen Uptake by Wheat Seedlings, Interactive Effects of Four Nitrogen Sources: NO3−, NO2−, NH4+, and Urea 1
AUTOR(ES)
Criddle, Richard S.
RESUMO
The net influx (uptake) rates of NO3−, NH4+, NO2−, and urea into roots of wheat (Triticum aestivum cv Yecora Rojo) seedlings from complete nutrient solutions containing all four compounds were monitored simultaneously. Although urea uptake was too slow to monitor, its presence had major inhibitory effects on the uptake of each of the other compounds. Rates of NO3−, NH4+, and NO2− uptake depended in a complex fashion on the concentration of all four N compounds. Equations were developed which describe the uptake rates of each of the compounds, and of total N, as functions of concentrations of all N sources. Contour plots of the results show the interactions over the range of concentrations employed. The coefficients of these equations provide quantitative values for evaluating primary and interactive effects of each compound on N uptake.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1054449Documentos Relacionados
- The Uptake of NO3−, NO2−, and NH4+ by Intact Wheat (Triticum aestivum) Seedlings 1: I. Induction and Kinetics of Transport Systems
- Uptake and Assimilation of NO3− and NH4+ by Nitrogen-Deficient Perennial Ryegrass Turf
- Buoyant Density Studies of Chloroplast and Nuclear Deoxyribonucleic Acid from Control and 3-Amino-1,2,4-Triazole-treated Wheat Seedlings, Triticum vulgare1
- Effects of Mn2+ and Mg2+ on assimilation of NO3- and NH4+ by soil microorganisms.
- Physiology, biochemistry, and specific inhibitors of CH4, NH4+, and CO oxidation by methanotrophs and nitrifiers.