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Ammonium transporters
Nitrate Transporters
NH4+
NO3-
Xylem
Glutamine
Glutamate
Root
Leaf
NO3-
Vacuole
NO2 -
Plastid
NiR
NRT
Glutamate
Glutamine
2 Ferredoxineox
2 Ferredoxinered
GOGAT
GS2
Glutamate
-Ketogluterate( -KG)
-Ketogluterate
Malate
Glutamate
Glutamine
GS1
NO2 -
Malate
NH4+
NH4+
Glutamate
Modified after: Yuan et al. (2007) Plant CellKrouk et al. (2010) Curr. Opin. Plant Biol.Arsova et al., (2012) Trends Plant Sci.Wang et al. (2012) Trends Plant Sci.
Nitrogen related signaling
AS
Asparagine
GS isoforms