Abstract
Most insects are dependent on chemical communication for activities such as mate finding or host location. Several plants, and especially orchids, mimic insect semiochemicals to attract insects for unrewarded pollination. Here, we present a new case of pheromone mimicry found in the terrestrial orchid Epipactis veratrifolia. Flowers are visited and pollinated by several species of aphidophagous hoverflies, the females of which also often lay eggs in the flowers. The oviposition behaviour of these hoverflies is mainly guided by aphid-derived kairomones. We show that the flowers produce α- and β-pinene, β-myrcene and β-phellandrene, and that these compounds attract and induce oviposition behaviour in female hoverflies. This floral odour profile is remarkably similar to the alarm pheromone released by several aphid species, such as Megoura viciae. We therefore suggest that E. veratrifolia mimics aphid alarm pheromones to attract hoverflies for pollination; this is the first time, to our knowledge, that such a ca of mimicry has been demonstrated.
Original language | English |
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Pages (from-to) | 1216-1222 |
Number of pages | 7 |
Journal | Proceedings of the Royal Society B: Biological Sciences |
Volume | 278 |
Issue number | 1709 |
DOIs | |
State | Published - 2011 |
Keywords
- Chemical mimicry
- Deceptive pollination
- Pheromone
ASJC Scopus subject areas
- General Immunology and Microbiology
- General Biochemistry, Genetics and Molecular Biology
- General Environmental Science
- General Agricultural and Biological Sciences