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  4. The broad-leaf herbicide 2,4-dichlorophenoxyacetic acid turns rice into a living trap for a major insect pest and a parasitic wasp
 
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The broad-leaf herbicide 2,4-dichlorophenoxyacetic acid turns rice into a living trap for a major insect pest and a parasitic wasp

Auteur(s)
Xin, Zhaojun
Yu, Zhaonan
Erb, Matthias 
PRN Biologie 
Turlings, Ted 
Institut de biologie 
Wang, Baohui
Qi, Jinfeng
Liu, Shengning
Lou, Yonggen
Date de parution
2012
In
New Phytologist
Vol.
2
No
194
De la page
498
A la page
510
Mots-clés
  • 2

  • 4-dichlorophenoxyacet...

  • plant defense

  • rice

  • synthetic chemical el...

  • tritrophic interactio...

Résumé
* ?Synthetic chemical elicitors of plant defense have been touted as a powerful means for sustainable crop protection. Yet, they have never been successfully applied to control insect pests in the field. * ?We developed a high-throughput chemical genetics screening system based on a herbivore-induced linalool synthase promoter fused to a ?-glucuronidase (GUS) reporter construct to test synthetic compounds for their potential to induce rice defenses. * ?We identified 2,4-dichlorophenoxyacetic acid (2,4-D), an auxin homolog and widely used herbicide in monocotyledonous crops, as a potent elicitor of rice defenses. Low doses of 2,4-D induced a strong defensive reaction upstream of the jasmonic acid and ethylene pathways, resulting in a marked increase in trypsin proteinase inhibitor activity and volatile production. Induced plants were more resistant to the striped stem borer Chilo suppressalis, but became highly attractive to the brown planthopper Nilaparvata lugens and its main egg parasitoid Anagrus nilaparvatae. In a field experiment, 2,4-D application turned rice plants into living traps for N. lugens by attracting parasitoids. * ?Our findings demonstrate the potential of auxin homologs as defensive signals and show the potential of the herbicide to turn rice into a selective catch crop for an economically important pest.
URI
https://libra.unine.ch/handle/123456789/19874
Type de publication
Resource Types::text::journal::journal article
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