NRT1.1, also called CHL1 or NPF6.3, is an Arabidopsis thaliana nitrate transporter with a nutrient-sensing role. Its nitrate-dependent effects on auxin transport connect external nitrogen availability to lateral-root development.
Changing transport or regulation can therefore alter root architecture as well as the amount of nutrient entering a biological cell. Experiments comparing nitrate conditions and auxin responses tested this connection, rather than inferring it solely from a growth correlation.[ref]
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