Abstract:
:Previous data have suggested an involvement of MDR/PGP-like ABC transporters in transport of the plant hormone auxin and, recently, AtPGP1 has been demonstrated to catalyze the primary active export of auxin. Here we show that related isoform AtPGP4 is expressed predominantly during early root development. AtPGP4 loss-of-function plants reveal enhanced lateral root initiation and root hair lengths both known to be under the control of auxin. Further, atpgp4 plants show altered sensitivities toward auxin and the auxin transport inhibitor, NPA. Finally, mutant roots reveal elevated free auxin levels and reduced auxin transport capacities. These results together with yeast growth assays suggest a direct involvement of AtPGP4 in auxin transport processes controlling lateral root and root hair development.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Santelia D,Vincenzetti V,Azzarello E,Bovet L,Fukao Y,Düchtig P,Mancuso S,Martinoia E,Geisler Mdoi
10.1016/j.febslet.2005.08.061keywords:
subject
Has Abstractpub_date
2005-10-10 00:00:00pages
5399-5406issue
24eissn
0014-5793issn
1873-3468pii
S0014-5793(05)01076-8journal_volume
579pub_type
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