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Plant Cell Reports

, Volume 35, Issue 1, pp 91–102 | Cite as

Growth regulating properties of isoprene and isoprenoid-based essential oils

  • Andrew Maxwell P. Jones
  • Mukund R. Shukla
  • Sherif M. Sherif
  • Paula B. Brown
  • Praveen K. Saxena
Original Article

Abstract

Key message

Essential oils have growth regulating properties comparable to the well-documented methyl jasmonate and may be involved in localized and/or airborne plant communication.

Abstract

Aromatic plants employ large amounts of resources to produce essential oils. Some essential oils are known to contain compounds with plant growth regulating activities. However, the potential capacity of essential oils as airborne molecules able to modulate plant growth/development has remained uninvestigated. Here, we demonstrate that essential oils from eight taxonomically diverse plants applied in their airborne state inhibited auxin-induced elongation of Pisum sativum hypocotyls and Avena sativa coleoptiles. This response was also observed using five monoterpenes commonly found in essential oils as well as isoprene, the basic building block of terpenes. Upon transfer to ambient conditions, A. sativa coleoptiles resumed elongation, demonstrating an antagonistic relationship rather than toxicity. Inclusion of essential oils, monoterpenes, or isoprene into the headspace of culture vessels induced abnormal cellular growth along hypocotyls of Arabidopsis thaliana. These responses were also elicited by methyl jasmonate (MeJA); however, where methyl jasmonate inhibited root growth essential oils did not. Gene expression studies in A. thaliana also demonstrated differences between the MeJA and isoprenoid responses. This series of experiments clearly demonstrate that essential oils and their isoprenoid components interact with endogenous plant growth regulators when applied directly or as volatile components in the headspace. The similarities between isoprenoid and MeJA responses suggest that they may act in plant defence signalling. While further studies are needed to determine the ecological and evolutionary significance, the results of this study and the specialized anatomy associated with aromatic plants suggest that essential oils may act as airborne signalling molecules.

Keywords

Essential oils Terpenoids Isoprene Airborne signalling 

Notes

Acknowledgments

The authors thank the Gosling foundation and the National Science and Engineering Research Council for supporting this work. Additionally, the authors acknowledge the contributions of Dr. Jaideep Mathur, Abhishek Chattopadhyay, and Shuping Li for their assistance in various aspects of the study.

Compliance with ethical standards

Conflict of interest

The authors have no competing interests.

Supplementary material

299_2015_1870_MOESM1_ESM.docx (2 mb)
Supplementary material 1 (DOCX 2060 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Andrew Maxwell P. Jones
    • 1
  • Mukund R. Shukla
    • 1
  • Sherif M. Sherif
    • 1
    • 2
  • Paula B. Brown
    • 3
  • Praveen K. Saxena
    • 1
  1. 1.Department of Plant Agriculture, Gosling Research Institute for Plant PreservationUniversity of GuelphGuelphCanada
  2. 2.Department of Horticulture, Faculty of AgricultureDamanhour UniversityDamanhourEgypt
  3. 3.British Columbia Institute of TechnologyBurnabyCanada

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