ZOL 355 Lecture Notes - Lecture 9: Nitrogen Fixation, Limiting Factor, Autotroph
Document Summary
Background: importance, important component of proteins, base of dna, a limiting nutrient and controls primary production, not in sufficient quantities, necessary for growth. Nucleotide bases: nitrogen reservoirs and nitrogen limitation, in the atmosphere is n2, can be used in this form, very few organisms can use nitrogen, nitrogen is not biologically available. Important terminology: when n enters a plant, we call this n uptake, if nitrogen is limiting then fertilizers have nitrogen in them, forms of n used by plants, ammonium (nh4. +) an ion: nitrate (no3, urea (nh2)2co) ) not very abundant: nitrite (no2, ammonia (nh3) a gas, bacteria, algae and plants can uptake ammonium, nitrate or urea across the cell wall of their roots, nitrogen synthesis, n uptake and synthesis, nh4. + - movement in to the cell nh4. + - amino acids - biomass: no3. - movement in to the cell nh4. + - amino acids - biomass: urea - movement in to the cell nh4.
