Roles for IBA-derived auxin in plant development

J Exp Bot. 2018 Jan 4;69(2):169-177. doi: 10.1093/jxb/erx298.


The plant hormone auxin is a central regulator of plant growth and development. Because auxin plays critical roles in cell division and cell expansion, plants use a number of cellular mechanisms to regulate auxin levels and response. Among these mechanisms is regulated input from the auxin precursor indole-3-butyric acid (IBA) toward the pool of active auxin [indole-3-acetic acid (IAA)]. In this review, we cover the mechanisms of IBA transport and conversion, and discuss specific roles for IBA-derived auxin in driving certain developmental events. We further discuss multiple open questions remaining for the IBA field.

Keywords: Auxin; IBA; plant development; root development; shoot development.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Indoleacetic Acids* / metabolism
  • Indoles / metabolism*
  • Plant Development*
  • Plant Growth Regulators / metabolism*
  • Plant Roots / growth & development
  • Plant Roots / metabolism


  • Indoleacetic Acids
  • Indoles
  • Plant Growth Regulators
  • indolebutyric acid
  • indoleacetic acid