Functional redundancy of PIN proteins is accompanied by auxin-dependent cross-regulation of PIN expression

Plant development displays an exceptional plasticity and adaptability that involves the dynamic, asymmetric distribution of the phytohormone auxin. Polar auxin flow, which requires polarly localized transport facilitators of the PIN family, largely contributes to the establishment and maintenance of the auxin gradients. Functionally overlapping action of PIN proteins mediates multiple developmental processes, including embryo formation, organ development and tropisms. Here we show that PIN proteins exhibit synergistic interactions, which involve cross-regulation of PIN gene expression in pin mutants or plants with inhibited auxin transport. Auxin itself positively feeds back on PIN gene expression in a…

• DF
  Deutsche Forschungsgemeinschaft

  Award: SFB 446
• VF
  Volkswagen Foundation
• FN
  Fundacja na rzecz Nauki Polskiej
• AS
  Austrian Science Fund
• VR
  Vlaamse regering