Abstract
Efficient nitrogen acquisition and allocation are important to enable plants to successfully compete for limited and fluctuating nitrogen sources in the soil and sustain vigorous growth. Over the past two decades, several types of nitrogen transporters, such as nitrate transporters, ammonium transporters, and amino acid transporters (Frommer et al. Proc Natl Acad Sci USA 90:5944–5948, 1993; Tsay et al. Cell 72:705–713, 1993; Ninnemann et al. EMBO J 13:3464–3471, 1994), have been identified using genetic approaches or functional complementation cloning in yeast. In this review, we focus on the physiological functions and influence of plasma membrane nitrate, ammonium, and amino acid transporters as revealed by the powerful molecular genetic tools available for investigating Arabidopsis.
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