PMID: 11912226Mar 26, 2002Paper

The Arabidopsis dual-affinity nitrate transporter gene AtNRT1.1 (CHL1) is regulated by auxin in both shoots and roots

Journal of Experimental Botany
Fang-Qing GuoNigel M Crawford

Abstract

The AtNRT1.1 (CHL1) gene of Arabidopsis encodes a dual-affinity nitrate transporter and contributes to both low and high affinity nitrate uptake. Localization studies have shown that CHL1 expression is preferentially targeted to nascent organs and growing regions of roots and shoots in Arabidopsis. In roots, CHL1 expression is concentrated in the tips of primary and lateral roots and is activated during lateral root initiation. In shoots, strong CHL1 expression is found in young leaves and developing flower buds. These findings suggest that CHL1 expression might be regulated by a growth signal such as the phytohormone auxin. To test this, auxin regulation of CHL1 was examined. Using transgenic Arabidopsis plants containing CHL1::GUS/GFP DNA constructs, it was found that treatment with exogenous auxin or introduction of the auxin overproducing mutations (yucca and rooty) resulted in a strong increase in CHL1::GUS/GFP signals in roots and leaves. When mature roots were treated with auxin to induce lateral root formation, CHL1::GFP signals were dramatically enhanced in dividing pericycle cells and throughout primordia development. RNA blot analysis showed that CHL1 mRNA levels in whole seedlings increase within 30 min of auxin tre...Continue Reading

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Citations

Jan 1, 2002·The Arabidopsis Book·Nigel M Crawford, Brian G Forde
May 20, 2003·Current Opinion in Plant Biology·Thomas J Buckhout, Oliver Thimm
Jul 11, 2012·Proceedings of the National Academy of Sciences of the United States of America·Lizheng QinSonglin Wang
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