PLANTS AND NITROGEN Flashcards
The complex pattern of nitrogen exchange between these three pools is known as the
nitrogen cycle
In the process of decomposition, organic nitrogen is converted to ammonia by a variety of microorganisms.
ammonification
These two groups are known as nitrifying bacteria and the result of their activities
nitrification
Nitrite is further oxidized to nitrate by members of the genus
nitrobacter
In taking up nitrate from the soil, plants must compete with bacteria known as
denitrifiers
these bacteria reduce nitrate to dinitrogen
denitrification
The process of reducing dinitrogen
to ammonia is known as
nitrogen fixation
Nitrogen fixation is a prokaryote domain; because only prokaryote organisms have the enzyme complex, called _________, that catalyses the reduction of dinitrogen to ammonia
dinitrogenase
Prokaryotes that fix nitrogen
nitrogen fixers
presence of very low oxygen partial pressures
microaerobic
In symbiotic associations the plant is identified as the
host
the microbial partner is known as
the
microsymbiont
Rhizobiwn, Bradyrhizobium, or
Azorhizobium. Collectively, these organisms are referred to as
rhizobia
most common form of symbiotic association results in the formation of enlarged,
multicellular structures on the root
nodules
Rhizobiwn, Bradyrhizobium, or
Azorhizobium. Collectively, these organisms are referred
to as
rhizobia
