Caterpillars induce jasmonates in flowers and alter plant responses to a second attacker

Lucille T.S. Chrétien, Anja David, Eirini Daikou, Wilhelm Boland, Jonathan Gershenzon, David Giron, Marcel Dicke, Dani Lucas-Barbosa*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)

Abstract

In nature, herbivorous insects and plant pathogens are generally abundant when plants are flowering. Thus, plants face a diversity of attackers during their reproductive phase. Plant responses to one attacker can interfere with responses to a second attacker, and phytohormones that orchestrate plant reproduction are also involved in resistance to insect and pathogen attack. We quantified phytohormonal responses of flowering plants exposed to single or dual attack and studied resistance mechanisms of plants in the flowering stage. Flowering Brassica nigra were exposed to either a chewing caterpillar, a phloem-feeding aphid or a bacterial pathogen, and plant hormonal responses were compared with dual attack situations. We quantified phytohormones in inflorescences and leaves, and determined the consequences of hormonal changes for components of direct and indirect plant resistance. Caterpillars were the main inducers of jasmonates in inflorescences, and the phytohormonal profile of leaves was not affected by either insect or pathogen attack. Dual attack increased plant resistance to caterpillars, but compromised resistance to aphids. Parasitoid performance was negatively correlated with the performance of their hosts. We conclude that plants prioritize resistance of reproductive tissues over vegetative tissues, and that a chewing herbivore species is the main driver of responses in flowering B. nigra.
Original languageEnglish
Pages (from-to)1279-1291
JournalNew Phytologist
Volume217
Issue number3
Early online date5 Dec 2017
DOIs
Publication statusPublished - Feb 2018

Keywords

  • Brassica nigra (Brassicaceae)
  • Florivorous insects
  • Flowers
  • Multiple attack
  • Parasitoids
  • Phytohormones
  • Phytopathogens
  • Plant resistance

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