Isopentylamine is a novel defence compound induced by insect feeding in rice

Takako Aboshi, Chiaki Iitsuka, Ivan Galis, Masayoshi Teraishi, Marina Kamo, Ayami Nishimura, Atsushi Ishihara, Naoki Mori, Tetsuya Murayama

Research output: Contribution to journalArticlepeer-review

Abstract

Plants produce a broad variety of defensive metabolites to protect themselves against herbivorous insects. Although polyamines have been implicated in various responses to abiotic and biotic stress, there have been no studies focused on amines in response to insect herbivory. By screening for bioactive amines, we identified isopentylamine as a novel type of herbivory-induced compound in rice leaves, which was derived from the amino acid leucine in stable isotope labelling experiments. Accumulation of isopentylamine increased during herbivory by the brown planthopper (Nilaparvata lugens, BPH) and the rice-feeding armyworm (Mythimna loreyi), as well as in response to treatment with the plant hormone, jasmonic acid. Likewise, isopentylamine accumulation was compromised in rice jasmonate biosynthesis mutants, hebiba and Osjar1. In bio-assays, BPH insects feeding on rice seedlings submerged in 50 mg/L isopentylamine solution had a higher mortality compared with BPH feeding on seedlings submerged in water. Notably, the rice leaves submerged in 50 mg/L solution showed the endogenous concentrations of isopentylamine similar to that induced by BPHs. These results suggest that isopentylamine functions as a new type of plant defence metabolite that is rapidly induced by herbivore attack and deters insect herbivores in rice.

Original languageEnglish
Pages (from-to)247-256
Number of pages10
JournalPlant Cell and Environment
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 2021

Keywords

  • amine
  • defence
  • herbivory
  • jasmonic acid
  • rice (Oryza sativa)
  • secondary metabolism

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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