Cis-cinnamic acid is a novel natural auxin efflux inhibitor that promotes lateral root formation

  • Steenackers, Ward
  • Klíma, Petr
  • Quareshy, Mussa
  • Cesarino, Igor
  • Kumpf, Robert
  • Corneillie, Sander
  • Araújo, Pedro
  • Viaene, Tom
  • Goeminne, Geert
  • Nowack, Moritz
  • Ljung, Karin
  • Friml, Jirí
  • Blakeslee, Joshua
  • Novák, Ondřej
  • Zažímalová, Eva
  • Napier, Richard
  • Boerjan, Wout
  • Vanholme, Bartel
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Publication date
January 2017
Publisher
American Society of Plant Biologists (ASPB)

Abstract

Auxin steers numerous physiological processes in plants, making the tight control of its endogenous levels and spatiotemporal distribution a necessity. This regulation is achieved by different mechanisms, including auxin biosynthesis, metabolic conversions, degradation, and transport. Here, we introduce cis-cinnamic acid (c-CA) as a novel and unique addition to a small group of endogenous molecules affecting in planta auxin concentrations. c-CA is the photo-isomerization product of the phenylpropanoid pathway intermediate trans-CA (t-CA). When grown on c-CA-containing medium, an evolutionary diverse set of plant species were shown to exhibit phenotypes characteristic for high auxin levels, including inhibition of primary root growth, induct...

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