Ozone degrades floral scent and reduces pollinator attraction to flowers

Gerard Farré-Armengol, Josep Peñuelas, Tao Li, Pasi Yli-Pirilä, Iolanda Filella, Joan Llusia, James D. Blande

    Research output: Contribution to journalArticleResearchpeer-review

    38 Citations (Scopus)

    Abstract

    © 2015 New Phytologist Trust. Summary: In this work we analyzed the degradation of floral scent volatiles from Brassica nigra by reaction with ozone along a distance gradient and the consequences for pollinator attraction. For this purpose we used a reaction system comprising three reaction tubes in which we conducted measurements of floral volatiles using a proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS) and GC-MS. We also tested the effects of floral scent degradation on the responses of the generalist pollinator Bombus terrestris. The chemical analyses revealed that supplementing air with ozone led to an increasing reduction in the concentrations of floral volatiles in air with distance from the volatile source. The results revealed different reactivities with ozone for different floral scent constituents, which emphasized that ozone exposure not only degrades floral scents, but also changes the ratios of compounds in a scent blend. Behavioural tests revealed that floral scent was reduced in its attractiveness to pollinators after it had been exposed to 120 ppb O3 over a 4.5 m distance. The combined results of chemical analyses and behavioural responses of pollinators strongly suggest that high ozone concentrations have significant negative impacts on pollination by reducing the distance over which floral olfactory signals can be detected by pollinators.
    Original languageEnglish
    Pages (from-to)152-160
    JournalNew Phytologist
    Volume209
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2016

    Keywords

    • Anisaldehyde
    • Behavioural tests
    • Bombus terrestris
    • Brassica nigra
    • Monoterpenes
    • p-cymene
    • Phenol

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