What do you mean by nitrate assimilation?
What do you mean by nitrate assimilation?
NITRATE assimilation is one of the two major biological processes by which inorganic nitrogen is converted to ammonia and thence to organic nitrogen. Thus, the control of nitrate assimilation can be important from the standpoint of both agricultural productivity and water resource management.
What is nitrogen fixation and nitrate assimilation?
Assimilation is the process by which plants and animals incorporate the NO3- and ammonia formed through nitrogen fixation and nitrification. Plants take up these forms of nitrogen through their roots, and incorporate them into plant proteins and nucleic acids.
Where does nitrate assimilation take place?
Nitrate assimilation is an apparently simple process in photosynthetic eukaryotes. The process involves two transport and two reduction steps to produce ammonium in the chloroplast, the main site of ammonium incorporation into carbon skeletons, and takes place by the glutamine synthetase/glutamate synthase cycle (Fig.
Which enzyme is responsible for nitrate assimilation in plants?
Nitrate reductase is the enzyme that catalyzes the first step in reduction of nitrate N to organic forms within the plant, and it is thought to reflect the level of N activity in leaves (Beevers and Hageman, 1969; Lane et al., 1975).
What type of transport is nitrate assimilation?
In photosynthetic eukaryotes, nitrate assimilation is performed by two transport and two reduction steps: First, nitrate is transported into the cell, then a cytosolic Nitrate Reductase (NR) catalyzes nitrate reduction to nitrite, which subsequently is transported into the chloroplast, where the enzyme Nitrite …
What are the four main processes of the nitrogen cycle?
Animals secure their nitrogen (and all other) compounds from plants (or animals that have fed on plants). Four processes participate in the cycling of nitrogen through the biosphere: (1) nitrogen fixation, (2) decay, (3) nitrification, and (4) denitrification. Microorganisms play major roles in all four of these.
What process converts nitrates into nitrogen gas?
Denitrification is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere.
What is the function of nitrate reductase?
Nitrate reductase (NR; EC 1.6. 6.1-3) catalyzes NAD(P)H reduction of nitrate to nitrite. NR serves plants, algae, and fungi as a central point for integration of metabolism by governing flux of reduced nitrogen by several regulatory mechanisms.
Can algae use nitrate?
Algae and other plants use nitrates as a source of food. If algae have an unlimited source of nitrates, their growth is unchecked. As the algae die and decompose, high levels of organic matter and the decomposing organisms deplete the water of available oxygen, causing the death of other organisms, such as fish.
What is assimilation with example?
The definition of assimilation is to become like others, or help another person to adapt to a new environment. An example of assimilation is the change of dress and behaviors an immigrant may go through when living in a new country.
Which is a model system for nitrate assimilation?
Nitrate assimilation is a key process for nitrogen (N) acquisition in green microalgae. Among Chlorophyte algae, Chlamydomonas reinhardtii has resulted to be a good model system to unravel important facts of this process, and has provided important insights for agriculturally relevant plants.
How are nitrogen fixers and non-fixers adapted to the nitrate assimilation process?
Although most legumes obtain nutrient nitrogen through symbiotic fixation of atmospheric nitrogen to ammonia, uptake and assimilation of nitrate from soil is also a significant process and often it is possible to modulate growth and productivity of nitrogen fixers as well as non-fixer legumes through the nitrate assimilation process.
How does nitrate assimilation take place in bacteria?
Nitrate uptake in most of these groups seems to involve a periplasmic binding protein-dependent system that presumably is energized by ATP hydrolysis (ATP-binding cassette transporters). However, Bacillus may, like fungi and plants, utilize electrogenic uptake through a representative of the major facilitator superfamily of transport proteins.
Which is the best strain for nitrate assimilation?
All results highlighted that strain Y-9 performs simultaneous nitrate assimilation, DNRA, and denitrification under aerobic conditions, and nirBD controls the assimilation and DNRA process. Thereinto, nitrate assimilation dominates the removal of nitrate. 1. Introduction
What do you mean by nitrate assimilation? NITRATE assimilation is one of the two major biological processes by which inorganic nitrogen is converted to ammonia and thence to organic nitrogen. Thus, the control of nitrate assimilation can be important from the standpoint of both agricultural productivity and water resource management. What is nitrogen fixation and…