Journal article Open Access

Why plants need more than one type of auxin

Simon, Sibu; Petrášek, Jan

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  "description": "The versatile functionality and physiological importance of the phytohormone auxin is a\nmajor focus of attention in contemporary plant science. Recent studies have substantially\ncontributed to our understanding of the molecular mechanisms underlying the physiological\nrole of auxin in plant development. The mechanism of auxin action includes both fast\nresponses not involving gene expression, possibly mediated by Auxin Binding Protein 1\n(ABP1), and slower responses requiring auxin-regulated gene expression mediated by F-box\nproteins. These two mechanisms of action have been described to varying degrees for the\nmajor endogenous auxin indole-3-acetic acid (IAA) and for the synthetic auxins 2,4-\ndichlorophenoxyacetic acid (2,4-D) and naphthalene-1-acetic acid (NAA). However, in\naddition to IAA, plants synthesize three other compounds that are commonly regarded as\n\"endogenous auxins\", namely, 4-chloroindole-3-acetic acid (4-Cl-IAA), indole-3-butyric acid\n(IBA) and phenylacetic acid (PAA). Although a spectrum of auxinic effects has been\nidentified for all these as well as several other endogenous compounds, we remain largely\nignorant of many aspects of their mechanisms of action and the extent to which they\ncontribute to auxin-regulated plant development. Here, we briefly summarize the action of\nIBA, 4-Cl-IAA and PAA, and discuss the extent to which their action overlaps with that of\nIAA or results from their metabolic conversions to IAA. Other possible pathways for their\naction are considered. We present a scheme for homeostatic regulation of IAA levels that\nembraces other endogenous auxins in terms of the described mechanism of auxin action\nincluding its receptor and downstream signal transduction events.", 
  "license": "", 
  "creator": [
      "@type": "Person", 
      "name": "Simon, Sibu"
      "@id": "", 
      "@type": "Person", 
      "name": "Petr\u00e1\u0161ek, Jan"
  "headline": "Why plants need more than one type of auxin", 
  "image": "", 
  "datePublished": "2011-03-01", 
  "url": "", 
  "@context": "", 
  "identifier": "", 
  "@id": "", 
  "@type": "ScholarlyArticle", 
  "name": "Why plants need more than one type of auxin"
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