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Self-recognition affects plant communication and defense.

Richard Karban1, Kaori Shiojiri

  • 1Department of Entomology, University of California, Davis, CA 95616, USA. rkarban@ucdavis.edu

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Area of Science:

  • Plant communication
  • Chemical ecology
  • Plant defense mechanisms

Background:

  • Animals distinguish self from non-self, enabling immune systems and kin selection.
  • Plant self-recognition is less understood, though root interactions suggest it.
  • Sagebrush uses volatile cues for herbivore defense, responding to self or neighbor signals.

Purpose of the Study:

  • To investigate if sagebrush plants discriminate between self and non-self volatile cues.
  • To determine if this discrimination affects resistance to herbivory.
  • To explore the role of volatile communication in plant self/non-self recognition.

Main Methods:

  • Sagebrush plants were exposed to volatile cues from genetically identical (self) or different (non-self) cuttings.
  • Natural herbivore damage was quantified on plants receiving different volatile cues.
  • Experimental setup excluded physical contact between plants.

Main Results:

  • Plants exposed to self-volatile cues accumulated significantly less natural herbivore damage compared to those exposed to non-self cues.
  • Volatile communication was essential for coordinating systemic induced resistance.
  • Plants demonstrated a more effective response to self-cues than non-self cues.

Conclusions:

  • Sagebrush plants can discriminate between self and non-self volatile cues without physical contact.
  • This discrimination enhances plant defense against herbivores.
  • Self/non-self recognition via volatile cues is a foundational step for potential kin recognition and selection in plants.