منابع مشابه
Nitrogen assimilation and nitrogen control in cyanobacteria.
Nitrogen sources commonly used by cyanobacteria include ammonium, nitrate, nitrite, urea and atmospheric N(2), and some cyanobacteria can also assimilate arginine or glutamine. ABC (ATP-binding cassette)-type permeases are involved in the uptake of nitrate/nitrite, urea and most amino acids, whereas secondary transporters take up ammonium and, in some strains, nitrate/nitrite. In cyanobacteria,...
متن کاملCarbon dioxide level and form of soil nitrogen regulate assimilation of atmospheric ammonia in young trees
The influence of carbon dioxide (CO2) and soil fertility on the physiological performance of plants has been extensively studied, but their combined effect is notoriously difficult to predict. Using Coffea arabica as a model tree species, we observed an additive effect on growth, by which aboveground productivity was highest under elevated CO2 and ammonium fertilization, while nitrate fertiliza...
متن کاملPotential importance of bacteria and fungi in nitrate assimilation in soil
Soil microorganisms can use a wide range of N compounds but are thought to prefer NH4 . Nevertheless, N isotope dilution studies have shown that microbial immobilization of NO3 can be an important process in many soils, particularly relatively undisturbed soils. Our objective was to develop a method for measuring NO3 immobilization potential so that the relative contributions of bacteria and fu...
متن کاملInorganic nitrogen assimilation in Chlamydomonas.
Inorganic nitrogen is an essential nutrient for photosynthetic organisms. Its efficient use in nature involves adaptation of the organisms to the availability of the nitrogen supply, to changing environmental conditions, and to the provision of carbon and other nutrients. The unicellular alga Chlamydomonas provides a useful model to identify not only each of the components participating in the ...
متن کاملNitrogen and Soil Fertility
amounts involved are much smaller. The amount of boron in the 7-ton potato crop (if determined) would have been about 0.2 pound. In the case of boron (and to a lesser degree the other micronutrients) if the soil contains excessive amounts, toxic quantities are absorbed by plants and growth is restricted. The need for a reasonable balance in amounts of available nutrients in the soil has been po...
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ژورنال
عنوان ژورنال: Science
سال: 1905
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.22.559.337