AtPIN4 mediates sink-driven auxin gradients and root patterning in Arabidopsis

Jiří Friml, Eva Benková, Ikram Blilou, Justyna Wisniewska, Thorsten Hamann, Karin Ljung, Scott Woody, Goran Sandberg, Ben Scheres, Gerd Jürgens, Klaus Palme*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

628 Scopus citations


In contrast to animals, little is known about pattern formation in plants. Physiological and genetic data suggest the involvement of the phytohormone auxin in this process. Here, we characterize a novel member of the PIN family of putative auxin efflux carriers, Arabidopsis PIN4, that is localized in developing and mature root meristems. Atpin4 mutants are defective in establishment and maintenance of endogenous auxin gradients, fail to canalize externally applied auxin, and display various patterning defects in both embryonic and seedling roots. We propose a role for AtPIN4 in generating a sink for auxin below the quiescent center of the root meristem that is essential for auxin distribution and patterning.

Original languageEnglish (US)
Pages (from-to)661-673
Number of pages13
Issue number5
StatePublished - Mar 8 2002

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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