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Auxins

  • Satish C Bhatla
Chapter

Abstract

The term “auxin” is derived from the Greek word auxein which means “to increase.” Auxins constitute an important group of naturally occurring hormones which have been detected practically in all land plants and in several soil- or plant-associated microbes. Naturally occurring auxins include indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), phenyl acetic acid, and 4-chloroindole-3-acetic acid (4-Cl-IAA). Of all these, IAA is the most extensively studied auxin (Fig. 15.1). Chemically, a common feature of all these molecules exhibiting auxin activity is the presence of acidic side chain on the aromatic ring. All the above natural auxins, except for phenyl acetic acid, are also indole derivatives.

Keywords

Auxin Acid growth hypothesis Apical dominance IAA Phytotropins PIN proteins Xylogenesis 

Suggested Further Readings

  1. Bishop G, Sakakibara H, Seo M, Yamaguchi S (2015) Biosynthesis of hormones. In: Buchanan BB, Gruissem W, Jones RL (eds) Biochemistry and molecular biology of plants. Wiley Blackwell, Chichester, pp 769–833Google Scholar
  2. Jiang Z, Li J, Qu LJ (2017) Auxins. In: Li J, Li C, Smith SM (eds) Hormone metabolism and signaling in plants. Academic Press, San Diego, pp 39–76CrossRefGoogle Scholar
  3. Leyser O, Day S (2015) Signal transduction. In: Buchanan BB, Gruissem W, Jones RL (eds) Biochemistry and molecular biology of plants. Wiley Blackwell, Chichester, pp 834–871Google Scholar
  4. Lüthen H (2015) What we can learn from old auxinology. J Plant Growth Regul 34:697–701CrossRefGoogle Scholar
  5. Paque S, Weijers D (2016) Q&A: Auxin: the plant molecule that influences almost anything. BMC Biol 14:67CrossRefGoogle Scholar
  6. Tivendale ND, Cohen JD (2015) Analytical history of auxin. J Plant Growth Regul 34:708–722CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Satish C Bhatla
    • 1
  1. 1.Department of BotanyUniversity of DelhiNew DelhiIndia

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