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Lecture 9

ZOL 355 Lecture Notes - Global Warming, Autotroph, Chemotroph
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7 Pages
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Department
Zoology
Course Code
ZOL 355
Professor
P.Ostrom

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Nitrogen Cycling
Background
Importance
o Important component of proteins
o Base of DNA
o A limiting nutrient and controls
primary production
Not in sufficient quantities
Necessary for growth
Nitrogen reservoirs and nitrogen limitation
o In the atmosphere is N2
Can be used in this form
o Very few organisms can use nitrogen
o 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
o Ammonium (NH4+) an ion
o Nitrate (NO3-)
o Urea (NH2)2CO)
o Nitrite (NO2-) not very abundant
o Ammonia (NH3) a gas
Reservoir
Size (1015 g)
Atmosphere
3,900,000
Ocean
23,348
Land
Soil: 460
Biota: 14.2
Nucleotide bases
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Bacteria, algae and plants can uptake ammonium, nitrate or urea across
the cell wall of their roots
Nitrogen synthesis
o N uptake and Synthesis
o NH4+ - movement in to the cell NH4+ - amino acids - biomass
o NO3- - movement in to the cell NH4+ - amino acids - biomass
o Urea - movement in to the cell NH4+ - amino acids - biomass
o Synthesis of the amino acid glutamic acid from NH4+
Reactions of the Nitrogen Cycle
Nitrogen fixation
o N2 - NH4+ - protein - biomass
o Nitrogen Fixation
o Plants an’t fix nitrogen
Only bacteria conduct N2 fixation
Can only fix nitrogen if they have a symbiotic relationship with
photosynthetic bacteria
o Plant nodules containing an abundance of N2 fixing bacteria
Cowpea
Soybean nodules and symbiotic bacteria
o Importance of N2 fixation for Sonoran Desert plants
Bacteria crust
o Question for exam: how does nitrogen control photosynthesis
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Description
Nitrogen Cycling Background Importance Nucleotide bases o Important component of proteins o Base of DNA o A limiting nutrient and controls primary production Not in sufficient quantities Necessary for growth Nitrogen reservoirs and nitrogen limitation o In the atmosphere is N2 Reservoir Size (10 g) Atmosphere 3,900,000 Can be used in this form Ocean 23,348 Land Soil: 460 o Very few organisms can use nitrogen Biota: 14.2 o 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 o Ammonium (NH ) an4ion o Nitrate (NO ) 3- o Urea (NH ) 2 2 o Nitrite (NO )2not very abundant o Ammonia (NH ) a3gas Bacteria, algae and plants can uptake ammonium, nitrate or urea across the cell wall of their roots Nitrogen synthesis o N uptake and Synthesis o NH -4 movement in to the cell NH - 4mino acids - biomass o NO -3 movement in to the cell NH - 4mino acids - biomass o Urea - movement in to the cell NH -4 amino acids - biomass o Synthesis of the amino acid glutamic acid from NH 4 Reactions of the Nitrogen Cycle Nitrogen fixation + o N
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