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Jasmonate-dependent plant defense restricts thrips performance and preference.

Hiroshi Abe1, Takeshi Shimoda, Jun Ohnishi

  • 1Experimental Plant Division, RIKEN BioResource Center, Tsukuba 305-0074, Japan. ahiroshi@rtc.riken.jp

BMC Plant Biology
|July 29, 2009
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Summary

Jasmonate (JA) plant defense restricts western flower thrips performance and preference. JA application enhances crop resistance, reducing thrips populations and damage in Arabidopsis and Chinese cabbage.

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Area of Science:

  • Plant Science
  • Entomology
  • Biochemistry

Background:

  • Western flower thrips (Frankliniella occidentalis) are major agricultural pests with widespread insecticide resistance.
  • Jasmonate (JA) signaling is crucial for immediate plant defense against herbivore feeding.
  • Previous studies highlighted JA's role in Arabidopsis leaf discs; this study examines whole-plant and crop responses.

Purpose of the Study:

  • To evaluate the effect of JA-regulated plant defense on thrips behavior and population dynamics at the whole-plant level.
  • To assess the efficacy of JA-mediated defense against thrips damage in Chinese cabbage (Brassica rapa).
  • To understand the practical application of JA in managing thrips infestations.

Main Methods:

  • Comparative analysis of thrips oviposition, preference, and population growth on wild-type (WT) and JA-insensitive Arabidopsis mutants (coi1-1).
  • Assessment of JA application effects on thrips populations in both Arabidopsis and Brassica rapa.
  • Gene expression analysis of JA response markers and quantification of JA content in Brassica rapa.

Main Results:

  • Thrips exhibited increased oviposition and preference for JA-insensitive Arabidopsis mutants, leading to higher population densities.
  • JA application to WT plants significantly reduced thrips populations.
  • In Brassica rapa, thrips feeding induced JA response genes and increased JA levels; JA application enhanced resistance, reduced oviposition, and decreased subsequent thrips generations.

Conclusions:

  • Jasmonate-regulated plant defense mechanisms effectively limit thrips performance, preference, and population growth.
  • JA signaling plays a vital role in the resistance of both model plants (Arabidopsis) and crop plants (Brassica rapa) to thrips damage.
  • These findings support the potential use of JA in integrated pest management strategies against western flower thrips.